Journal articles: 'Hydrus1D'

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Samaniego, Jessie, and Maria Antonia Tanchuling. "PREDICTING USEFUL LIFE OF COCOPEAT IN A FILTER BED TREATING WASTEWATER WITH HEAVY METALS USING HYDRUS-1D." ASEAN Engineering Journal 9, no. 2 (December 1, 2019): 44–56. http://dx.doi.org/10.11113/aej.v9.15512.

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The effectiveness of cocopeat as an adsorbent for the treatment of wastewater containing heavy metals was reported in previous studies. In this study, cocopeat was used as an adsorbent in a filter bed system treating wastewater from a small scale gold mining (SSGM) ball mill facility. A total of 6,000 L of actual SSGM wastewater collected from a ball mill facility in Paracale, Camarines Norte were used in the experimental runs. The filter bed was evaluated by determining its heavy metal removal efficiencies for 50 days at a flow rate of 40 L/hr. After the experimental runs, HYDRUS1D was used to simulate the transport of lead (Pb) in the filter bed and predict the remaining useful life of cocopeat as a heavy metal adsorbent. Lead was selected for the solute transport modeling in HYDRUS-1D since Pb was the highest concentration in the wastewater and also exceeded the government effluent limit. Measured data from the experimental runs and water flow parameters of cocopeat were used as input values in the simulation with varying cocopeat thickness and initial concentration flux. Results showed that by increasing the thickness of the cocopeat layer, the useful life of cocopeat in the filter bed was extended. By using the actual concentration of Pb (0.0933 mg/L) in the wastewater, HYDRUS-1D was able to simulate Pb transport in the filter and predict that the useful life of cocopeat 50 cm thick treating an actual SSGM wastewater was 2.74 years.

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Selle, B., and B. Huwe. "Optimising soil-hydrological predictions using effective CART models." Advances in Geosciences 5 (December 16, 2005): 37–41. http://dx.doi.org/10.5194/adgeo-5-37-2005.

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Abstract. There are various problems with process-based models at the landscape scale, including substantial computational requirements, a multitude of uncertain input parameters and the limited parameter identificability. Classification And Regression Trees (CART) is a recent data-based approach that is likely to yield advantages both over process-based models and simple empirical models. This non-parametric regression technique can be used to simplify process-based models by extracting key variables, which govern the process of interest at a specified scale. In other words, the model complexity can be fitted to the information content in the data. CART is applied to model spatially distributed percolation in soils using weather data and the groundwater depths specific to the site. The training data was obtained by numerical experiments with Hydrus1D. Percolation is effectively predicted using CART but the model performance is highly dependant on the available data and the boundary conditions. However, the effective CART models possess an optimal complexity that corresponds to the information content in the data and hence, are particularly suited for environmental management purposes.

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Siltecho, S., C. Hammecker, V. Sriboonlue, C. Clermont-Dauphin, V. Trelo-ges, A. C. D. Antonino, and R. Angulo-Jaramillo. "Use of field and laboratory methods for estimating unsaturated hydraulic properties under different land uses." Hydrology and Earth System Sciences 19, no. 3 (March 3, 2015): 1193–207. http://dx.doi.org/10.5194/hess-19-1193-2015.

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Abstract. Adequate water management is required to improve the efficiency and sustainability of agricultural systems when water is scarce or over-abundant, especially in the case of land use changes. In order to quantify, to predict and eventually to control water and solute transport into soil, soil hydraulic properties need to be determined precisely. As their determination is often tedious, expensive and time-consuming, many alternative field and laboratory techniques are now available. The aim of this study was to determine unsaturated soil hydraulic properties under different land uses and to compare the results obtained with different measurement methods (Beerkan, disc infiltrometer, evaporation, pedotransfer function). The study has been realized on a tropical sandy soil in a mini-watershed in northeastern Thailand. The experimental plots were positioned in a rubber tree plantation in different positions along a slope, in ruzi grass pasture and in an original forest site. Non-parametric statistics demonstrated that van Genuchten unsaturated soil parameters (Ks, α and n) were significantly different according to the measurement methods employed, whereas the land use was not a significant discriminating factor when all methods were considered together. However, within each method, parameters n and α were statistically different according to the sites. These parameters were used with Hydrus1D for a 1-year simulation and computed pressure head did not show noticeable differences for the various sets of parameters, highlighting the fact that for modeling, any of these measurement methods could be employed. The choice of the measurement method would therefore be motivated by the simplicity, robustness and its low cost.

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Siltecho, S., C. Hammecker, V. Sriboonlue, C. Clermont-Dauphin, V. Trelo-ges, A. C. D. Antonino, and R. Angulo-Jaramillo. "Use of field and laboratory methods for estimating unsaturated hydraulic properties under different land-use." Hydrology and Earth System Sciences Discussions 11, no. 6 (June 10, 2014): 6099–137. http://dx.doi.org/10.5194/hessd-11-6099-2014.

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Abstract. Adequate water management is required to improve the efficiency and sustainability of agricultural systems when water is scarce or over-abundant, especially in the case of land-use changes. In order to quantify, to predict and eventually to control water and solute transport into soil, soil hydraulic properties need to be determined precisely. As their determination is often tedious, expensive and time-consuming, many alternative field and laboratory techniques are now available. The aim of this study was to determine unsaturated soil hydraulic properties under different land-uses and to compare the results obtained with different measurement methods (Beerkan, Disk infiltrometer, Evaporation, pedotransfer function). The study has been realised on a tropical sandy soil in a mini watershed in NE Thailand. The experimental plots were positioned in a rubber tree plantation in different positions along a slope, in ruzi grass pasture and in an original forest site. Non parametric statistics demonstrated that van Genuchten unsaturated soil parameters (Ks, α and n), were significantly different according to the measurement methods employed whereas location was not a significant discriminating factor when all methods were considered together. However within each method, parameters n and α were statistically different according to the sites. These parameters were used with Hydrus1D for a one year simulation and computed pressure head did not show noticeable differences for the various sets of parameters, highlighting the fact that for modelling, any of these measurement method could be employed. The choice of the measurement method would therefore be motivated by the simplicity, robustness and its low cost.

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Šimůnek, Jiří, Miroslav Šejna, and Martinus Th van Genuchten. "New features of version 3 of the HYDRUS (2D/3D) computer software package." Journal of Hydrology and Hydromechanics 66, no. 2 (June 1, 2018): 133–42. http://dx.doi.org/10.1515/johh-2017-0050.

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AbstractThe capabilities of the HYDRUS-1D and HYDRUS (2D/3D) software packages continuously expanded during the last two decades. Various new capabilities were added recently to both software packages, mostly by developing new standard add-on modules such as HPx, C-Ride, UnsatChem, Wetland, Fumigant, DualPerm, and Slope Stability. The new modules may be used to simulate flow and transport processes in one- and two-dimensional transport domains and are fully supported by the HYDRUS graphical user interface (GUI). Several nonstandard add-on modules, such as Overland, Isotope, and Centrifuge, have also been developed, but are not fully supported by the HYDRUS GUI. The objective of this manuscript is to describe several additional features of the upcoming Version 3 of HYDRUS (2D/3D), which was unveiled at a recent (March 2017) HYDRUS conference and workshop in Prague. The new features include a flexible reservoir boundary condition, expanded root growth features, and new graphical capabilities of the GUI. Mathematical descriptions of the new features are provided, as well as two examples illustrating applications of the reservoir boundary condition.

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Phillips, I. R. "Modelling water and chemical transport in large undisturbed soil cores using HYDRUS-2D." Soil Research 44, no. 1 (2006): 27. http://dx.doi.org/10.1071/sr05109.

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The ability of HYDRUS-2D (HYDRUS) to simulate water and chemical transport in large, undisturbed cores of a Vertosol and a Podosol soil was investigated. Parameters required by HYDRUS for simulating water and chemical transport, and nitrogen transformation, were obtained from previously published laboratory studies. HYDRUS simulated the measured cumulative drainage and cumulative chloride (Cl–) leaching behaviour very closely for both soil types, and also provided a very good description of coupled nitrogen transformation (conversion of ammonium to nitrate) and leaching (coefficient of model efficiency ∼1). There was little correlation between measured and predicted potassium (K+) leaching from the Podosol, suggesting that the mathematical equations governing the transport of reactive chemicals did not adequately reflect K+ behaviour in this coarse-textured soil. The reason for this discrepancy is unclear but may have been related to the use of sorption parameters obtained from batch rather than miscible displacement techniques, or mechanisms controlling K+ sorption were not well represented by the general non-linear sorption equation used by HYDRUS. The ability of HYDRUS to accurately simulate water and non-reactive chemical transport agrees with previous studies; however, more investigation into its suitability for predicting the movement reactive chemicals in soil is warranted.

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Beegum, Sahila, Jiří Šimůnek, Adam Szymkiewicz, K. P. Sudheer, and Indumathi M. Nambi. "Updating the Coupling Algorithm between HYDRUS and MODFLOW in the HYDRUS Package for MODFLOW." Vadose Zone Journal 17, no. 1 (2018): 180034. http://dx.doi.org/10.2136/vzj2018.02.0034.

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Shelia, Vakhtang, Jirka Šimůnek, Ken Boote, and Gerrit Hoogenbooom. "Coupling DSSAT and HYDRUS-1D for simulations of soil water dynamics in the soil-plant-atmosphere system." Journal of Hydrology and Hydromechanics 66, no. 2 (June 1, 2018): 232–45. http://dx.doi.org/10.1515/johh-2017-0055.

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AbstractAccurate estimation of the soil water balance of the soil-plant-atmosphere system is key to determining the availability of water resources and their optimal management. Evapotranspiration and leaching are the main sinks of water from the system affecting soil water status and hence crop yield. The accuracy of soil water content and evapotranspiration simulations affects crop yield simulations as well. DSSAT is a suite of field-scale, process-based crop models to simulate crop growth and development. A “tipping bucket” water balance approach is currently used in DSSAT for soil hydrologic and water redistribution processes. By comparison, HYDRUS-1D is a hydrological model to simulate water flow in soils using numerical solutions of the Richards equation, but its approach to crop-related process modeling is rather limited. Both DSSAT and HYDRUS-1D have been widely used and tested in their separate areas of use. The objectives of our study were: (1) to couple HYDRUS-1D with DSSAT to simulate soil water dynamics, crop growth and yield, (2) to evaluate the coupled model using field experimental datasets distributed with DSSAT for different environments, and (3) to compare HYDRUS-1D simulations with those of the tipping bucket approach using the same datasets. Modularity in the software design of both DSSAT and HYDRUS-1D made it easy to couple the two models. The pairing provided the DSSAT interface an ability to use both the tipping bucket and HYDRUS-1D simulation approaches. The two approaches were evaluated in terms of their ability to estimate the soil water balance, especially soil water contents and evapotranspiration rates. Values of thedindex for volumetric water contents were 0.9 and 0.8 for the original and coupled models, respectively. Comparisons of simulations for the pod mass for four soybean and four peanut treatments showed relatively highdindex values for both models (0.94–0.99).

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Dmytruk, Y., and V. Zakharovskyi. "Hydrus’s-1D capability for assessment of soils water regime." AgroChemistry and Soil Science, no. 89 (2020): 18–27. http://dx.doi.org/10.31073/acss89-02.

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Anwar, A. H. M. Faisal, and Larissa Chan Thien. "Investigating Leachate Transport at Landfill Site Using HYDRUS-1D." International Journal of Environmental Science and Development 6, no. 10 (2015): 741–45. http://dx.doi.org/10.7763/ijesd.2015.v6.691.

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Nascimento, Ícaro Vasconcelos do, Raimundo Nonato de Assis Júnior, José Carlos de Araújo, Thiago Leite de Alencar, Alcione Guimarães Freire, Márcio Godofrêdo Rocha Lobato, Cillas Pollicarto da Silva, Jaedson Claúdio Anunciato Mota, and Carla Danielle Vasconcelos do Nascimento. "Estimation of van Genuchten Equation Parameters in Laboratory and through Inverse Modeling with Hydrus-1D." Journal of Agricultural Science 10, no. 3 (February 9, 2018): 102. http://dx.doi.org/10.5539/jas.v10n3p102.

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Soil water retention curve (SWRC) becomes important because it guides when and how much to irrigate, optimizing the use of water; can be obtained in the field or laboratory, being commonly determined in the laboratory with porous plate apparatus, and the determination is compromised by issues such as time and labor. In this context, inverse modeling emerges, which allows to obtain a variable going from the effect to the cause, using Hydrus-1D. Hence, this study aims to obtain van Genuchten equation parameters through inverse modeling with Hydrus-1D and make the respective comparisons and inferences. Matric potential data were obtained over time in an instantaneous profile-type experiment. Six sets of three tensiometers each were installed surrounding the center of the experimental plot, at depths of 0.20, 0.35 and 0.50 m. Target depth was 0.35 m, where the roots of most crops are concentrated, and the other tensiometers were used to obtain the potential gradient. Matric potential data were used to feed Hydrus-1D and obtain the van Genuchten equation parameters. Laboratory curves were obtained using porous plate apparatus, with four replicates. It was concluded that, in general, the Hydrus-1D model estimates van Genuchten equation parameters and, consequently, the SWCC of an Argissolo more consistently with field conditions than those obtained in the laboratory; and, provided it is fed with field data, the Hydrus-1D simulates well the behavior of matric potential and moisture over time, reducing the time and labor in the procedures to obtain van Genuchten equation parameters in the laboratory.

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J. Å imunek, M. Th. van Genuchten, and M. Å ejna. "HYDRUS: Model Use, Calibration, and Validation." Transactions of the ASABE 55, no. 4 (2012): 1263–76. http://dx.doi.org/10.13031/2013.42239.

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Melo, Cristiane Ribeiro de, Paulo Abadie Guedes, Samuel França Amorim, Fellipe Henrique Borba Alves, and José Almir Cirilo. "Combined analysis of landslide susceptibility and soil water dynamics in a metropolitan area, northeast Brazil." Soils and Rocks 44, no. 2 (June 18, 2021): 1–14. http://dx.doi.org/10.28927/sr.2021.051420.

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Landslide susceptibility and water balance in the soil, in the community of Lagoa Encantada, Recife Metropolitan Area, Brazil, were assessed using the computational models SINMAP and HYDRUS-1D. The SINMAP input parameters were the physical and hydrodynamic characteristics of the soil, evidence of landslides and the DEM; and for the HYDRUS-1D model, the hydraulic parameters of the soil. For both programs, simulations were also carried out, based on the rain recorded in the area. The soil was classified using the Unified Soil Classification System (USCS). To assess infiltration processes that cause landslides, HYDRUS-1D was used, under the same scenarios simulated by the SINMAP model and also in the evaluation of the infiltrated volume, in real landslides. The SINMAP results (susceptibility maps) show a 71% increase in the susceptible area (SI < 1; SI = stability index) between the two precipitation scenarios, and are consistent with evidence of landslides. The HYDRUS-1D results complement SINMAP results and suggest that infiltration values for simulated scenarios were similar to those of real landslides. It is concluded that it is possible to map areas of greater instability and to predict possible landslides in different precipitation scenarios, by quantitatively assessing the infiltrated volume that contributes to the destabilization of the soil.

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Saso, J. K., G. W. Parkin, C. F. Drury, J. D. Lauzon, and W. D. Reynolds. "Chloride leaching in two Ontario soils: Measurement and prediction using HYDRUS-1D." Canadian Journal of Soil Science 92, no. 2 (February 2012): 285–96. http://dx.doi.org/10.4141/cjss2011-046.

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Saso, J. K., Parkin, G. W., Drury, C. F., Lauzon, J. D. and Reynolds, W. D. 2012. Chloride leaching in two Ontario soils: Measurement and prediction using HYDRUS-1D. Can. J. Soil Sci. 92: 285–296. Deterministic numerical modelling can often be used to complement and extend field results, and to provide extra insight into the mechanisms of water and solute movement within the profile of agricultural soils. Chloride leaching and near-surface soil water content in a Guelph loam and a Maryhill loam cropped to corn (Zea mays L.) were measured over a 12-mo period (October 2007 to September 2008) and simulated using the HYDRUS-1D numerical model (version 4.12). Field measurements and prediction indicated that over 70% of the applied chloride (Cl) was lost to deep drainage (below 80 cm depth) during the winter months (November 2007 to April 2008) in both soils. Normalized root mean square error (NRMSE) values for HYDRUS-1D estimates of near-surface (0- to 30-cm depth interval) soil water content over the growing season (April to September, 2008) were 28% for Guelph loam and 42% for Maryhill loam. The NRMSE value for estimated versus measured Cl mass remaining in the soil profile (0–80 cm depth interval) over the winter months was 17% for both soils. It was concluded that the HYDRUS-1D model can provide reasonable predictions of near-surface soil water content and profile leaching losses of tracer solutes. Further work is required, however, to determine if the predictive ability of HYDRUS-1D might be improved by incorporating the effects of freeze-thaw cycles on soil hydraulic properties and solute leaching. Further study is also required to establish the model's ability to simulate the leaching behaviour of reactive solutes, such as nitrate, in agricultural soils.

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Haowen, Xie, Wu Yawen, Wang Luping, Luo Weilin, Zhou Wenqi, Zhou Hong, Yan Yichen, and Liu Jun. "Comparing simulations of green roof hydrological processes by SWMM and HYDRUS-1D." Water Supply 20, no. 1 (October 3, 2019): 130–39. http://dx.doi.org/10.2166/ws.2019.140.

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Abstract Green roofs are a sustainable, low-impact development technique. They can reduce peak stormwater runoff and runoff volume and improve the quality of runoff from individual buildings and developments, which can lower the risk of frequent urban flooding and improve the quality of receiving waters. Few studies have compared different types of green roof models under the same rainfall intensities; thus, in this study, the predictions of a non-linear storage reservoirs model, Storm Water Management Model (SWMM), and a physical process model (HYDRUS-1D) were discussed. Both models were compared against measured data obtained from a series of laboratory experiments, designed to represent different storm categories and rainfall events. It was concluded that the total runoff of the SWMM model is always less than that of HYDRUS-1D. The maximum flowrate of the SWMM model is more than that of HYDRUS-1D during all events.

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Conceição, Beatriz Santos, Eugênio Ferreira Coelho, João José da Silva Junior, José Antonio do Vale Sant’Ana, and Mauro Aparecido Martinez. "Simulation of nitrate and potassium concentrations in soil solution using parametric models and Hydrus-2D." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 16, no. 1 (January 26, 2021): 1. http://dx.doi.org/10.4136/ambi-agua.2606.

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This study estimated the nitrate and potassium concentration in the soil solution of drainage lysimeter using the mathematical models developed by Vogeler et al. (1996) and Muñoz-Carpena et al. (2005) and the computational model Hydrus-2D, while comparing the simulated and observed data using statistical parameters. The cultivar used for the study was ‘Prata Gorutuba’. The experimental plots were six lysimeters of drainage. Fertigation was performed weekly. The mathematical models developed by Vogeler et al. (1996) and Muñoz-Carpena et al. (2005) were used to determine the specific concentration of a given ion (Ci). The Hydrus software was used to simulate the dynamics of nutrients. The concentrations of nitrate and potassium in the soil solution were estimated by the model of Vogeler et al. (1996), adapted to the linear type CEw-Ci ratio and simulated by the Hydrus model, resulting in an acceptable characterization of the distribution of these nutrients.

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Sutanto, S. J., J. Wenninger, A. M. J. Coenders-Gerrits, and S. Uhlenbrook. "Partitioning of evaporation into transpiration, soil evaporation and interception: a comparison between isotope measurements and a HYDRUS-1D model." Hydrology and Earth System Sciences 16, no. 8 (August 10, 2012): 2605–16. http://dx.doi.org/10.5194/hess-16-2605-2012.

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Abstract. Knowledge of the water fluxes within the soil-vegetation-atmosphere system is crucial to improve water use efficiency in irrigated land. Many studies have tried to quantify these fluxes, but they encountered difficulties in quantifying the relative contribution of evaporation and transpiration. In this study, we compared three different methods to estimate evaporation fluxes during simulated summer conditions in a grass-covered lysimeter in the laboratory. Only two of these methods can be used to partition total evaporation into transpiration, soil evaporation and interception. A water balance calculation (whereby rainfall, soil moisture and percolation were measured) was used for comparison as a benchmark. A HYDRUS-1D model and isotope measurements were used for the partitioning of total evaporation. The isotope mass balance method partitions total evaporation of 3.4 mm d−1 into 0.4 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.6 mm d−1 for transpiration, while the HYDRUS-1D partitions total evaporation of 3.7 mm d−1 into 1 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.3 mm d−1 for transpiration. From the comparison, we concluded that the isotope mass balance is better for low temporal resolution analysis than the HYDRUS-1D. On the other hand, HYDRUS-1D is better for high temporal resolution analysis than the isotope mass balance.

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Tárník, Andrej, and Dušan Igaz. "Validation of Hydrus 1D Model in Selected Catchment of Slovakia." Acta Horticulturae et Regiotecturae 20, no. 1 (May 1, 2017): 24–27. http://dx.doi.org/10.1515/ahr-2017-0006.

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Abstract Soil water content is very important for agricultural practice. Direct measurements of the soil moisture are being replaced by mathematical simulations and models step by step. One of the most used models for the simulation of the soil moisture is HYDRUS 1D model. This paper deals with HYDRUS 1D validity check in the Nitra River Catchment. Three different localities in the Nitra River Catchment (Malanta, Kolíňany and Dolné Naštice) were chosen for model validity check. Both, measurements and modelling of soil moisture, were made for these localities in three years (8/2011 - 8/2014). The evaluation of model validity was performed by calculation of the correlation coefficient and count of comparisons with variance of 15%. The correlation coefficients of measured and simulated data were between 0.67 and 0.95. Data comparisons with variance of 15% among measured and simulated data were between 79 to 100%. Based on these results we can declare that HYDRUS 1D model is valid for the conditions of Slovak catchments.

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Al-Shukaili, A., A. Al-Mayahi, A. Al-Maktoumi, and A. R. Kacimov. "Unlined trench as a falling head permeameter: Analytic and HYDRUS2D modeling versus sandbox experiment." Journal of Hydrology 583 (April 2020): 124568. http://dx.doi.org/10.1016/j.jhydrol.2020.124568.

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Ma, Wen Cui, Xue Yi You, Xin Xin Wang, and Yu Chen. "Numerical Simulation of Migration and Transformation of Petroleum Hydrocarbons in Soils." Advanced Materials Research 1073-1076 (December 2014): 653–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.653.

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Considering the diffusion, adsorption or desorption, and microbial degradation of petroleum hydrocarbons (PHs) in the soil–water system, the numerical model describing the migration and transportation of PHs is estabilished and it is simulated by HYDRUS-1D model. The degradation effect of time and depth variation of PHs is gained by numerical simulation. The results show that the degradation ability of indigenous microbial of PHs is poor. The HYDRUS-1D software is feasible in simulating and predicting the migration and transformation of PHs in soils.

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Radka Kodešová and Lukáš, Brodský. "Comparison of CGMS-WOFOST and HYDRUS-1D Simulation Results for One Cell of CGMS-GRID50." Soil and Water Research 1, No. 2 (January 7, 2013): 39–48. http://dx.doi.org/10.17221/6504-swr.

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CGMS (Crop Growth Monitoring System) developed by JRC is an integrated system to monitor crop behaviour and quantitative crop yield forecast that operates on a European scale. To simulate water balance in the root zone the simulation model CGMS-WOFOST (SUPIT & VAN DER GOOT 2003) is used that is based on water storage routing. This study was performed to assess a possible impact of simplifications of the water storage routing based model on simulated water regime in the soil profile. Results of CGMS-WOFOST are compared with results of a more precise Richards’ equation based model HYDRUS-1D (&Scaron;IMŮNEK et al. 2005). 16 scenarios are simulated using HYDRUS-1D. Each scenario represents a single soil profile presented in the selected cell of GRID50 in the Czech Republic. Geometry of the soil profiles, material (texture) definition, root distributions, measured daily rainfall, calculated daily evaporation from the bare soil surface and transpiration of crop canopy were defined similarly to CGMS-WOFOST inputs according to the data stored in the SGDBE40 database. The soil hydraulic properties corresponding to each soil layer were defined using the class transfer rules (WÖSTEN et al. 1999). The bottom boundary conditions were defined either similarly to CGMS-WOFOST bottom boundary condition as a free drainage or as a constant water level 250 cm below the soil surface to demonstrate a ground water impact on the soil profile water balance. The relative soil moisture (RSM) in the root zone during the vegetation period was calculated to be compared with the similar output from CGMS. The RSM values obtained using HYDRUS-1D are higher than those obtained using CGMS-WOFOST mostly due to higher retention ability of HYDRUS-1D. The reasonably higher RSM values were obtained at the end of simulated period using the HYDRUS-1D for the constant water level 250 cm below the soil surface.

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Selker, John. "Modelling Variably Saturated Flow with HYDRUS-2D." Vadose Zone Journal 3, no. 2 (May 2004): 725. http://dx.doi.org/10.2136/vzj2004.0725.

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Selker, John, and Ryan Stewart. "Soil Physics with HYDRUS: Modeling and Applications." Vadose Zone Journal 10, no. 4 (November 2011): 1338–39. http://dx.doi.org/10.2136/vzj2011.0085br.

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Selker, J. "Modelling Variably Saturated Flow with HYDRUS-2D." Vadose Zone Journal 3, no. 2 (May 1, 2004): 725. http://dx.doi.org/10.2113/3.2.725.

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Liu, Tiegang, Jianbin Lai, Yi Luo, and Lei Liu. "Study on extinction depth and steady water storage in root zone based on lysimeter experiment and HYDRUS-1D simulation." Hydrology Research 46, no. 6 (January 20, 2015): 871–79. http://dx.doi.org/10.2166/nh.2015.191.

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HYDRUS-1D was combined with lysimeter experiments to study extinction depth and steady water storage in root zone (Ws) of groundwater evaporation (ETgw) under winter wheat and silt soil. The measured soil water contents and daily ETgw with various groundwater depths were used to calibrate and validate the parameters in HYDRUS-1D. In total, 13 groundwater depths ranging from 0.5 to 5.0 m were set up for scenario simulation to determine the extinction depth and Ws. The results showed that HYDRUS-1D had an acceptable performance in simulating the soil water storage in the 0–60 cm layer and the daily ETgw. Moreover, the ETgw decreased linearly with increasing groundwater depth from 0.5 to 2.5 m and decreased as a power function with increasing groundwater depth from 2.5 to 5.0 m. Under the condition of winter wheat and silt soil, the extinction depth of ETgw was about 5.0 m. Ws decreased linearly with increasing groundwater depth from 0.7 to 2.0 m, but was not influenced further by the groundwater at depths beyond 2.0 m.

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Kim, Jeong Jik, Woo-Hyun Jeon, and Jin-Yong Lee. "Estimation of deep percolation using field moisture observations and HYDRUS-1D modeling in Haean basin." Journal of the Geological Society of Korea 54, no. 5 (October 31, 2018): 545–56. http://dx.doi.org/10.14770/jgsk.2018.54.5.545.

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Rubio, Carles M., and Rafael Poyatos. "Applicability of Hydrus-1D in a Mediterranean Mountain Area Submitted to Land Use Changes." ISRN Soil Science 2012 (February 19, 2012): 1–7. http://dx.doi.org/10.5402/2012/375842.

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The aim of this research is to evaluate the reliability and accuracy of the Hydrus-1D model to simulate the measured dynamics of water flow in a silt loam soil profile located in an abandoned crop area. The paper includes a physical and chemical characterization of the soil, and hydraulic properties characteristics as well. Several techniques and devices were used to develop the experiment in both, field and laboratory scales. The last part of the study was the Hydrus-1D simulation using real rain events and evapotranspiration rates. In summary, it could predict accurately the water dynamics of this “natural” scenario.

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Zeng, Wen-Zhi, Guo-Qing Lei, Hong-Ya Zhang, Ming-Hai Hong, Chi Xu, Jing-Wei Wu, and Jie-Sheng Huang. "Estimating Root Zone Moisture from Surface Soil Using Limited Data." Ecological Chemistry and Engineering S 24, no. 4 (December 1, 2017): 501–16. http://dx.doi.org/10.1515/eces-2017-0033.

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Abstract For estimation of root-zone moisture content from EO-1/Hyperion imagery, surface soil moisture was first predicted by hyperspectral reflectance data using partial least square regression (PLSR) analysis. The textures of more than 300 soil samples extracted from a 900 m × 900 m field site located within the Hetao Irrigation District in China were used to parameterize the HYDRUS-1D numerical model. The study area was spatially discretized into 18,000 compartments (30 m × 30 m × 0.02 m), and Monte Carlo simulations were applied to generate 2000 different soil-particle size distributions for each compartment. Soil hydraulic properties for each realization were determined by application of artificial neural network analysis and used to parameterize HYDRUS-1D to simulate averaged soil-moisture contents within the root zone (0-40 cm) and surface (approximately 0-4 cm). Then the link between surface moisture and root zone was established by use of linear regression analysis, resulting in R and RMSE of 0.38 and 0.03, respectively. Kriging and co-kriging with observed surface moisture, and co-kriging with surface moisture obtained from Hyperion imagery were also used to estimate root-zone moisture. Results indicated that PLSR is a powerful tool for soil moisture estimation from hyperspectral data. Furthermore, co-kriging with observed surface moisture had the highest R (0.41) and linear regression model, and HYDRUS Monte Carlo simulations had a lowest RMSE (0.03) among the four methods. In regions that have similar climatic and soil conditions to our study area, a linear regression model with HYDRUS Monte Carlo simulations is a practical method for root-zone moisture estimation before sowing and it can be easily coupled with remote sensing technology.

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Mujtaba, Babar, Hana Hlaváčiková, Michal Danko, João L. M. P. de Lima, and Ladislav Holko. "The role of stony soils in hillslope and catchment runoff formation." Journal of Hydrology and Hydromechanics 68, no. 2 (June 1, 2020): 144–54. http://dx.doi.org/10.2478/johh-2020-0012.

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AbstractThe role of stony soils in runoff response of mountain catchments is rarely studied. We have compared simulated response of stony soils with measured catchment runoff for events caused by rains of small and high intensities in the mountain catchment of the Jalovecký Creek, Slovakia. The soil water response was simulated for three sites with stoniness 10–65% using the Hydrus-2D single porosity model. Soil hydraulic parameters employed in the modelling, i. e. the saturated hydraulic conductivity and parameters of the soil water retention curves, were obtained by two approaches, namely by the Representative Elementary Volume approach (REVa) and by the inverse modelling with Hydrus-1D model (IMa). The soil water outflow hydrographs simulated by Hydrus-2D were compared to catchment runoff hydrographs by analysing their skewness and peak times. Measured catchment runoff hydrographs were similar to simulated soil water outflow hydrographs for about a half of rainfall events. Interestingly, most of them were caused by rainfalls with small intensity (below 2.5 mm/10 min). The REV approach to derive soil hydraulic parameters for soil water outflow modelling provided more realistic shapes of soil water outflow hydrographs and peak times than the IMa approach.

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Mobilia, Mirka, and Antonia Longobardi. "Impact of rainfall properties on the performance of hydrological models for green roofs simulation." Water Science and Technology 81, no. 7 (April 1, 2020): 1375–87. http://dx.doi.org/10.2166/wst.2020.210.

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Abstract Green roofs (GR) are effective tools for the mitigation of the negative hydrological impact linked to uncontrolled urbanization. Models for runoff response of vegetated covers support planning decisions about the use of this technology in ever-expanding areas, but there is still large uncertainty in this research area. The goal of the present study was to define the accuracy of three selected models for the simulation of the hydrological behavior of a GR, with a particular focus on the precipitation pattern characteristics. The Nash cascade model, Storm Water Management Model (SWMM), and HYDRUS-1D models were selected. Each model was calibrated over 24 rainfall-runoff events collected at the experimental site located in Southern Italy. Rainfall events were characterized using several criteria and were divided into convective, stratiform, and tropical precipitation types according to the shape of the rainfall profile identified by the rainfall binary shape code. The models returned overall satisfactory performances with average Nash–Sutcliffe Efficiency index of 0.65 for the SWMM and HYDRUS and 0.73 for the Nash model. In general, the models were better performing for stratiform and tropical events. SWMM and HYDRUS predicted with higher accuracy the convective events while the Nash model appeared more suitable for stratiform events.

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Šimůnek, Jirka, and Martinus Th van Genuchten. "Modeling Nonequilibrium Flow and Transport Processes Using HYDRUS." Vadose Zone Journal 7, no. 2 (May 2008): 782–97. http://dx.doi.org/10.2136/vzj2007.0074.

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Nieć, Jakub, Paweł Zawadzki, Zbigniew Walczak, and Marcin Spychała. "CALCULATING EARTH DAM SEEPAGE USING HYDRUS SOFTWARE APPLICATIONS." Acta Scientiarum Polonorum Formatio Circumiectus 3 (2017): 43–56. http://dx.doi.org/10.15576/asp.fc/2017.16.3.43.

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Laspas, Panagiotis, Julian Garcia-Feijoo, Jose M. Martinez-de-la-Casa, Jose M. Larrosa, Antonio Fea, Hans Lemij, Stefano Gandolfi, Katrin Lorenz, Thomas W. Samuelson, and Norbert Pfeiffer. "Three-Year Results of Hydrus Microstent with Phacoemulsification." Ophthalmology Glaucoma 2, no. 6 (November 2019): 440–42. http://dx.doi.org/10.1016/j.ogla.2019.08.006.

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Tawfik, Ahmed Mohamed, and Abdallah Sadik Bazaraa. "Design approach for interceptor tile drains using hydrus." Ain Shams Engineering Journal 9, no. 4 (December 2018): 3221–28. http://dx.doi.org/10.1016/j.asej.2018.07.001.

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Ebrahimian, Hamed, and Hamideh Noory. "Modeling paddy field subsurface drainage using HYDRUS-2D." Paddy and Water Environment 13, no. 4 (November 11, 2014): 477–85. http://dx.doi.org/10.1007/s10333-014-0465-8.

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Cai, Yaohui, Xiao Zhao, Pute Wu, Lin Zhang, Delan Zhu, and Junying Chen. "Effect of Soil Texture on Water Movement of Porous Ceramic Emitters: A Simulation Study." Water 11, no. 1 (December 22, 2018): 22. http://dx.doi.org/10.3390/w11010022.

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Choosing reasonable design parameters for ceramic emitters used in subsurface irrigation is important for reducing the deep percolation of water and improving the water use efficiency. Laboratory experiments and numerical simulations with the HYDRUS-2D software were carried out to analyze the effect of soil texture on the infiltration characteristics of porous ceramic emitters used for subsurface irrigation. HYDRUS-2D predictions of emitter discharge in soil and wetting front are in agreement with experimental results, and the HYDRUS-2D model can be used to accurately simulate soil water movement during subsurface irrigation with ceramic emitters in different soil textures. Results show that soil texture has a significant effect on emitter discharge, soil matrix potential around the emitter, and wetting front. For 12 different soil textures, the aspect ratio of the wetting front is basically between 0.84–1.49. In sandy soil, the wetting front mainly appears as an ellipse; but in the clay, the wetting front is closer to a circle. As irrigation time increases, emitter discharge gradually decreases to a stable value; however, emitter discharge in different texture soils is quite different. In order to improve the crop water use efficiency in sandy soil, soil water retention can be improved by adding a clay interlayer or adding water retention agent, reducing the risk of deep percolation and improving the water use efficiency.

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Dias, Allana Siqueira, and Willames De Albuquerque Soares. "Desempenho do modelo Hydrus - 1D utilizando diferentes formas de caracterização hidrodinâmica." Holos Environment 19, no. 3 (July 30, 2019): 376. http://dx.doi.org/10.14295/holos.v19i3.12309.

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A utilização da modelagem matemática para a simulação dos eventos hidrológicos é de fundamental importância no planejamento do uso e conservação do solo, para agricultura e pecuária, na meteorologia e na gestão dos recursos hídricos, sendo uma ferramenta conveniente para a avaliação de impactos no meio ambiente devido as atividades humanas.O uso agropecuário de alguns tipos de solo (como é o caso do Neossolo Flúvico) depende de suas condições de drenagem e se são necessárias correções desse fator ou não. Condições estas, que podem ser caracterizadas com o uso de modelos computacionais, como o Hydrus – 1D.Assim, o presente trabalho teve como objetivo avaliar o desempenho de quatro formas de caracterização hidrodinâmica do solo oferecidas pelo software Hydrus – 1D por meio das curvas de retenção de água do solo e da condutividade hidráulica. Os valores dos parâmetros hidráulicos do solo, bem como da condutividade hidráulica, foram determinados em ensaio e para analisar o desempenho dos modelos foram utilizados parâmetros estatísticos. O modelo que apresentou melhor desempenho nas simulações foi o que utilizou as informações da composição granulométrica do solo como dado de entrada e o modelo com o pior desempenho foi o que utilizou as informações da composição granulométrica e da densidade do material estudado, diferentemente do esperado, fato atribuído a alta sensibilidade relativa, no modelo Hydrus-1D, no cálculo dos parâmetros hidrodinâmicos “n” e “0s"> ”.

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Berger, Klaus. "Operational validation of HYDRUS (2D/3D) for capillary barriers using data of a 10-m tipping trough." Journal of Hydrology and Hydromechanics 66, no. 2 (June 1, 2018): 153–60. http://dx.doi.org/10.1515/johh-2017-0059.

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AbstractCapillary barriers are an interesting alternative component for cover systems of landfills and contaminated sites. Provided they are sufficiently validated, soil hydrological models could be fast and powerful tools for the dimensioning of capillary barriers. Outflow rates measured in a 10 m long tipping trough for one material combination and two slopes from stationary periods were compared to simulation results of HYDRUS (2D/3D), Version 2.05. The measured outflow rates show a typical pattern with slope-dependent threshold values indicating the efficiency of the capillary barrier. This flow pattern could not be reproduced with HYDRUS (2D/3D) that for different input setups produced smooth patterns without thresholds. The input setup was varied for different soil hydraulic models (van Genuchten-Mualem vs. Brooks-Corey), homogeneous and heterogeneous transport domains (no scaling vs. stochastically distributed scaling factors considering the Miller-Miller similitude), different HYDRUS versions (standard vs. alternative; i.e., with material properties assigned either to finite element nodes or finite elements, respectively), and different lower boundary conditions (seepage face vs. free drainage). Differences between measured and simulated outflow patterns could be caused by the measurements, the application of the model, or by the model itself. The van Genuchten-Mualem model may not be suitable to describe the soil hydrological relationships of these particular materials. The reason for the mismatch, however, could not be identified yet.

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Grecco, Katarina Lira, Douglas Roberto Bizari, and Claudinei Fonseca Souza. "AVALIAÇÃO DO MODELO HYDRUS-2D NA DISTRIBUIÇÃO DO SOLUTO NO GOTEJAMENTO SUBSUPERFICIAL." IRRIGA 1, no. 01 (June 18, 2018): 113. http://dx.doi.org/10.15809/irriga.2016v1n01p113-125.

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AVALIAÇÃO DO MODELO HYDRUS-2D NA DISTRIBUIÇÃO DO SOLUTO NO GOTEJAMENTO SUBSUPERFICIAL KATARINA LIRA GRECCO1; DOUGLAS ROBERTO BIZARI2 E CLAUDINEI FONSECA SOUZA3 1Doutoranda, Departamento de Engenharia de Biossistemas, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Av. Pádua Dias, 11, 13418-900, Piracicaba, SP, klgrecco@usp.br2Professor, Departamento de Desenvolvimento Rural, Centro de Ciências Agrárias, Universidade Federal de São Carlos, Rodovia Anhanguera, km 174, 13600-970, Araras, SP, dbizari@cca.ufscar.br3Professor, Departamento de Recursos Naturais e Proteção Ambiental, Centro de Ciências Agrárias, Universidade Federal de São Carlos, Rodovia Anhanguera, km 174, 13600-970, Araras, SP, cfsouza@cca.ufscar.br 1 RESUMO A competição pelo uso da água entre agricultura, indústria e população vem tornando-se intensa no decorrer dos anos, exigindo um uso racional deste recurso para produção de alimentos. O gotejamento subsuperficial pode auxiliar os produtores com a otimização de parâmetros operacionais como frequência e duração da irrigação, vazão, espaçamento e profundidade do gotejador. Estas informações podem ser obtidas por simulações numéricas através de modelos matemáticos. Desta forma, o objetivo deste trabalho foi avaliar o modelo HYDRUS-2D a partir de dados experimentais para a previsão das dimensões dos bulbos molhados gerados por gotejadores subsuperficiais de distintas taxas de aplicações (1,0 e 1,6 L h-1). O modelo foi avaliado com base nos seguintes parâmetros estatísticos: Coeficiente de Determinação e Correlação (R2 e R), Raiz do Erro Quadrático Médio (RMSE) e Erro Absoluto Médio (MAE). Os resultados indicaram que o deslocamento horizontal permaneceu o maior comparado com o deslocamento vertical em todos os bulbos molhados, tanto os observados nos ensaios experimentais como os estimados pelo modelo e a correlação entre ambos foi elevada, acima de 0,90 com erros abaixo de 16%. Conclui-se que o modelo HYDRUS-2D pode ser utilizado para estimar as dimensões do bulbo molhado, obtendo novas informações sobre o dimensionamento do sistema de irrigação. Palavras-chave: bulbo molhado, concentração de nutriente, modelo matemático. GRECCO, K. L.; BIZARI, D. R.; SOUZA, C. F.EVALUATION OF HYDRUS-2D MODEL FOR SOLUTE DISTRIBUTION IN SUBSURFACE DRIP 2 ABSTRACT The competition for water use between agriculture, industry and population has become intense over the years, requiring a rational use of this resource for food production. The subsurface drip irrigation can help producers with the optimization of operating parameters such as frequency and duration of irrigation, flow, spacing and depth of the dripper installation. This information can be obtained by numerical simulations using mathematical models, thus the aim of this study was to evaluate the HYDRUS-2D model from experimental data to predict the size of the wet bulbs generated by emitters of different application rates (1.0 and 1.6 L h-1). The results showed that horizontal displacement (bulb diameter) remained the largest in all the bulbs, observed both in experimental trials and estimated by the model and the correlation between them was high, above 0.90 to below 16% error. We conclude that the HYDRUS-2D model can be used to estimate the dimensions of the wet bulb, and getting new information on the sizing of the irrigation system. Keywords: wet bulb, nutrient concentration, mathematical model.

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Arrey, I. A., J. O. Odiyo, R. Makungo, and M. O. Kataka. "Effect of hysteresis on water flow in the vadose zone under natural boundary conditions, Siloam Village case study, South Africa." Journal of Hydroinformatics 20, no. 1 (October 17, 2017): 88–99. http://dx.doi.org/10.2166/hydro.2017.091.

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Abstract A one-dimensional vadose zone model was used to simulate flow under natural boundary conditions. The effects of hysteresis and temporal variability of meteorological conditions were evaluated. Simulations were performed in HYDRUS-1D code for the period April 2013–January 2014 (6601 hours) at three different locations in a delineated portion of the sub-quaternary catchment A80A of Nzhelele with different soil textures. Soil hydraulic characteristics were estimated in a Rosetta library dynamically linked to the HYDRUS-1D model which is based on the numerical solution of a one-dimensional Richard's equation. Analysis of the simulation results suggests that ignoring hysteresis for soils of similar textural class does not lead to any significant deviation of the model predicted soil moisture, unlike for soils with different textural classes.

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Arbat, Gerard, Sílvia Cufí, Miquel Duran-Ros, Jaume Pinsach, Jaume Puig-Bargués, Joan Pujol, and Francisco Ramírez de Cartagena. "Modeling Approaches for Determining Dripline Depth and Irrigation Frequency of Subsurface Drip Irrigated Rice on Different Soil Textures." Water 12, no. 6 (June 17, 2020): 1724. http://dx.doi.org/10.3390/w12061724.

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Water saving techniques such as drip irrigation are important for rice (Oriza sativa L.) production in some areas. Subsurface drip irrigation (SDI) is a promising alternative for intensive cropping since surface drip irrigation (DI) requires a higher degree of labor to allow the use of machinery. However, the semi-aquatic nature of rice plants and their shallow root system could pose some limitations. A major design issue when using SDI is to select the dripline depth to create appropriate root wetting patterns as well as to reduce water losses by deep drainage and evaporation. Soil texture can greatly affect soil water dynamics and, consequently, optimal dripline depth and irrigation frequency needs. Since water balance components as deep percolation are difficult to estimate under field conditions, soil water models as HYDRUS-2D can be used for this purpose. In the present study, we performed a field experiment using SDI for rice production with Onice variety. Simulations using HYDRUS-2D software successfully validated soil water distribution and, therefore, were used to predict soil water contents, deep drainage, and plant water extraction for two different dripline depths, three soil textures, and three irrigation frequencies. Results of the simulations show that dripline depth of 0.15 m combined with one or two daily irrigation events maximized water extraction and reduced percolation. Moreover, simulations with HYDRUS-2D could be useful to determine the most appropriate location of soil water probes to efficiently manage the SDI in rice.

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Iqbal, Mazhar, Md Rowshon Kamal, Mohd Amin Mohd Soom, Muhammad Yamin, Mohd Fazly M., Hasfalina Che Man, and Hadi Hamaaziz Muhammed. "HYDRUS-1D Simulation of Nitrogen Dynamics in Rainfed Sweet Corn Production." Applied Sciences 10, no. 11 (June 5, 2020): 3925. http://dx.doi.org/10.3390/app10113925.

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Nitrogen loss from agricultural fields results in contamination of ground and surface water resources due to leaching and runoff, respectively. Nitrogen transport dynamics vary significantly among agricultural fields of different climates, especially in the tropical climate. This study intended to evaluate the rainfall impact on nitrogen distribution and losses under tropical rain-fed conditions. The study was carried out in a sweet corn field for two growing seasons at the Malaysian Agricultural Research and Development Institute (MARDI) research field. The HYDRUS-1D numerical model was used to simulate nitrogen transport dynamics in this study. The observed nitrogen concentrations were used for calibration and validation of the model. Total nitrogen input to sweet corn was 120 kg/ha for both seasons. Nitrogen losses through surface runoff and leaching were dominating pathways. Surface runoff accounted for 35.3% and 22.2% of total nitrogen input during the first and second seasons, respectively. The leaching loss at 60 cm depth accounted for 4.0% (first season) and 18.5% (second season). The crop N uptake was 37.5% and 24.9% during the first and second seasons, respectively. Nitrate was the dominant form of N uptake by the crop that accounted for 83.6% (first season) and 78.5% (second season). The HYDRUS-1D simulation results of nitrogen concentrations and fluxes were found in good agreement with observed data. The overall results of simulation justified the HYDRUS-1D for improved fertilizer use in the tropical climate.

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Wang, Xiaofang, Yi Li, Yichen Wang, and Chuncheng Liu. "Performance of HYDRUS-1D for simulating water movement in water-repellent soils." Canadian Journal of Soil Science 98, no. 3 (September 1, 2018): 407–20. http://dx.doi.org/10.1139/cjss-2017-0116.

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Soil water repellency affects soil water movement during infiltration significantly. The HYDRUS software has been popularly applied in soil water dynamics simulation for many years, but its performance in water-repellent (WR) soils has not been assessed thoroughly. Our objectives are to assess the performance of HYDRYUS-1D for cumulative infiltration (CI), wetting front (Zf), and volumetric soil water content (θv) during horizontal imbibition and vertical infiltration in wettable, slightly WR, and strongly WR soils. The key parameters of α and n in water retention curves were inversely estimated by RETension Curve software. The α and n were calibrated inversely until the observed data fitted the simulated values well enough. The α and n were then used for validation using three statistical parameters including relative root-mean-square error, R2, and Nash–Sutcliffe efficiency coefficient. The performances of calibration and validation for wettable, slightly, and strongly WR soils were good enough to be used for further simulations (RRMSE ≤20.2% for calibration and ≤21.1% for validation). Soil water movements for strongly WR soils of variable ponded depth during vertical infiltration were simulated. For Lou soil, as the ponded depth increased from 4 to 10 cm, the CI and Zf increased 2.08 and 5.5 cm, respectively. The simulations for the other three soils also showed gradually increased CI and Zf values. In conclusion, the performances of HYDRUS-1D in four different soil types with changing WR levels were good, which confirmed the application of HYDRUS-1D in WR soils.

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Zapata-Sierra, Antonio Jesús, José Roldán-Cañas, Rafael Reyes-Requena, and María Fátima Moreno-Pérez. "Study of the Wet Bulb in Stratified Soils (Sand-Covered Soil) in Intensive Greenhouse Agriculture under Drip Irrigation by Calibrating the Hydrus-3D Model." Water 13, no. 5 (February 25, 2021): 600. http://dx.doi.org/10.3390/w13050600.

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The development of the wet bulb under drip irrigation in sand-covered soils presents a different behavior compared to the one observed in homogeneous soils. Moreover, the presence of a very active crop imposes a series of variations that have not been fully characterized. The aim of this work is to present the data acquisition methodology to calibrate and validate the Hydrus-3D model in order to safely define the evolution of moisture in wet bulbs generated in stratified “sanded” soils characteristic of greenhouses with intensive pepper crop under drip irrigation. The procedure for collecting and processing moisture data in stratified soils has been defined. Soil permeability; retention curve, texture, and bulk density have been measured experimentally for each material. It has been found that the inclusion of a previous day in the simulation improves model predictions of soil moisture distribution. In soils with less gravel, a lower average stress and a more homogeneous moisture distribution were observed. It has been proved that the Hydrus-3D model can reproduce the behavior of sand covered soils under intensive greenhouse growing conditions, and it has been possible to verify that the predictions are adequate to what has been observed in the field. In view of the results, the Hydrus-3D model could be used to establish future irrigation strategies or to locate the optimal placement point of tensiometers that control irrigation in sandy soils for intensive agriculture.

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Hilten, Roger Norris, Thomas Mark Lawrence, and Earnest William Tollner. "Modeling stormwater runoff from green roofs with HYDRUS-1D." Journal of Hydrology 358, no. 3-4 (September 2008): 288–93. http://dx.doi.org/10.1016/j.jhydrol.2008.06.010.

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Š;imůnek, Jirka, Diederik Jacques, Martinus Th Genuchten, and Dirk Mallants. "MULTICOMPONENT GEOCHEMICAL TRANSPORT MODELING USING HYDRUS-1D AND HP11." Journal of the American Water Resources Association 42, no. 6 (December 2006): 1537–47. http://dx.doi.org/10.1111/j.1752-1688.2006.tb06019.x.

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Faúndez Urbina, Carlos Alberto, Jos Dam, Darell Tang, Harm Gooren, and Coen Ritsema. "Estimating macropore parameters for HYDRUS using a meta‐model." European Journal of Soil Science 72, no. 5 (March 21, 2021): 2006–19. http://dx.doi.org/10.1111/ejss.13103.

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van Zijl, George, Johan van Tol, Darren Bouwer, Simon Lorentz, and Pieter le Roux. "Combining Historical Remote Sensing, Digital Soil Mapping and Hydrological Modelling to Produce Solutions for Infrastructure Damage in Cosmo City, South Africa." Remote Sensing 12, no. 3 (January 29, 2020): 433. http://dx.doi.org/10.3390/rs12030433.

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Urbanization and hydrology have an interactive relationship, as urbanization changing the hydrology of a system and the hydrology commonly causing structural damage to the infrastructure. Hydrological modelling has been used to quantify the water causing structural impacts, and to provide solutions to the issues. However, in already-urbanized areas, creating a soil map to use as input in the modelling process is difficult, as observation positions are limited and visuals of the natural vegetation which indicate soil distribution are unnatural. This project used historical satellite images in combination with terrain parameters and digital soil mapping methods to produce an accurate (Kappa statistic = 0.81) hydropedology soil map for the Cosmo City suburb in Johannesburg, South Africa. The map was used as input into the HYDRUS 2D and SWAT hydrological models to quantify the water creating road damage at Kampala Crescent, a road within Cosmo City (using HYDRUS 2D), as well as the impact of urbanization on the hydrology of the area (using SWAT). HYDRUS 2D modelling showed that a subsurface drain installed at Kampala Crescent would need a carrying capacity of 0.3 m3·h−1·m−1 to alleviate the road damage, while SWAT modelling shows that surface runoff in Cosmo City will commence with as little rainfall as 2 mm·month−1. This project showcases the value of multidisciplinary work. The remote sensing was invaluable to the mapping, which informed the hydrological modelling and subsequently provided answers to the engineers, who could then mitigate the hydrology-related issues within Cosmo City.

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Laroche, Daniel, Gideon Nkrumah, and Chester Ng. "Real-world efficacy of the Hydrus microstent in Black and Afro-Latinx patients with glaucoma: a retrospective study." Therapeutic Advances in Ophthalmology 12 (January 2020): 251584142096431. http://dx.doi.org/10.1177/2515841420964311.

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Purpose: The purpose was to determine the real-world efficacy of phacoemulsification cataract surgery and Hydrus microstent in Black and Afro-Latinx patients with glaucoma. Methods: A retrospective noncomparative single-center study of 76 Black and Afro-Latinx patients with glaucoma who underwent phacoemulsification cataract surgery and Hydrus microstent placement for treatment of glaucoma at single practice. Investigated parameters were intraocular pressure (IOP), number of medications, mean deviation on visual field test, and visual acuity. Patients were also subgrouped into mild, moderate, and advance glaucoma for further analysis. Results: We reviewed a total of 76 patients who had 6 months of follow up in the study. The mean number of medications decreased significantly from 2.6 ± 1.5 preoperatively to 0.72 ± 1.4 in 6 months ( p < 0.0010), while IOP decreased from 14.7 ± 3.7 to 13.9 ± 4.3 ( p = 0.25). At 6 months, 55 patients (74%) of all patients were medication free ( n = 27, 84.4% mild glaucoma; n = 17, 70.8% moderate glaucoma; n = 10, 50% advance glaucoma). There was significant improvement in visual acuity ( p < 0.00010) and stabilization of mean deviation on visual field test (baseline −9.2; 6 months −9.1; p = 0.22). The most common adverse effect was a transient IOP spike and transient corneal edema ( n = 6, 7.9%; n = 6, 7.9%, respectively) with spontaneous resolution in all cases. No sight-threatening complications were reported at 6 months. Conclusion/clinical relevance: This 6-month retrospective study demonstrated the efficacy of phacoemulsification cataract surgery and Hydrus microstent in reducing the medication burden while maintaining lower IOP in Black and Afro-Latinx patients with glaucoma.

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Huang, Kai, Desuo Cai, Jinchuang Jinchuang, and Wei Pan. "Experimental and Numerical Analysis of Drip Tape Layout for Irrigation of Sugarcane in Latosol." Open Biotechnology Journal 9, no. 1 (November 12, 2015): 265–71. http://dx.doi.org/10.2174/1874070701509010265.

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A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus- 3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L.

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Journal articles on the topic 'Hydrus1D'

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