Relevant bibliographies by topics / Hydrus1D

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Academic literature on the topic 'Hydrus1D'

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Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "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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Dissertations / Theses on the topic "Hydrus1D"

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ALVES, Edevaldo Miguel. "Aplicação do programa HYDRUS1D em solo cultivado com feijão Caupi." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/9503.

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Made available in DSpace on 2014-06-12T23:14:52Z (GMT). No. of bitstreams: 2 arquivo2703_1.pdf: 1309644 bytes, checksum: 86b0cb830591cd451fdaf944c055c9ee (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O feijão caupi (Vigna unguiculata L. Walp.) é uma cultura que apresenta enorme importância econômica e social para os agricultores da região nordeste do Brasil por ser o alimento básico das populações mais pobres dessa região. O feijoeiro é uma planta sensível ao déficit hídrico e ao excesso de água no solo, portanto, o conhecimento da dinâmica da água no solo é fundamental para os estudos sobre o uso de água pela cultura, proporcionando a otimização da produção. Os processos envolvidos nas trocas de água no sistema solo-planta-atmosfera são geralmente complexos e numerosos, o que dificulta sua medição de forma direta, contínua e por grandes intervalos de tempo. Assim, os modelos numéricos tornam-se ferramentas importantes na busca por conhecimento e possibilita a previsão de alguns resultados. Desta forma, o objetivo geral deste trabalho é simular a dinâmica da água no solo cultivado com feijão caupi por meio do programa Hydrus1D, em períodos com diferentes condições climáticas e nas quatro fases fenológica da cultura (emergência, vegetativa, reprodutiva e maturação). Os dados necessários para a simulação foram obtidos numa área de 4,0 ha do Centro de Ciências Agrárias, da UFPB, no município de Areia, PB (6o 58 12 S, 35o 42 15 O). A área foi instrumentada com uma torre micrometeorológica automática, além de sensores instalados para a determinação dos perfis de umidade volumétrica do solo. Foi feita uma análise de sensibilidade do programa Hydrus1D relativa aos parâmetros do solo e aos parâmetros do modelo de Feddes de extração de água pela raiz do feijão caupi. O programa foi calibrado em dois períodos, um com o solo sem vegetação e outro com o solo vegetado, e depois utilizado em sete dias representativos dentro das quatro fases fenológicas da cultura. O programa Hydrus1D simulou de forma satisfatória a evolução da umidade volumétrica do solo nas profundidades de 20, 40, 60 e 80 cm, apesar da subestimativa feita pelo programa na profundidade de 40 cm. As simulações da evolução do armazenamento de água e a evapotranspiração apresentaram bons resultados quando comparado com os valores medidos em campo, permitindo simular o balanço hídrico nas suas fases fenológicas e em diferentes eventos de precipitação
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Virgínia, Salgueiro Gondim Manuella. "Simulação do transporte do paclobutrazol em dois solos do vale do São Francisco." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/9163.

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Made available in DSpace on 2014-06-12T23:13:27Z (GMT). No. of bitstreams: 2 arquivo2651_1.pdf: 1017082 bytes, checksum: efbba4bb2fb7cf07724e9e38e7c7e02f (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009
Conselho Nacional de Desenvolvimento Científico e Tecnológico
O nordeste brasileiro supre a demanda de exportação de manga nos meses em que a oferta é inexistente e um dos fatores responsáveis pelo aumento da produção destes frutos são as substâncias reguladoras de crescimento vegetal. Entre elas destaca-se o paclobutrazol (PBZ), porém, este composto pode permanecer ativo no solo durante alguns anos, sendo necessário estudar os destinos e as conseqüências de seu transporte no solo. Os modelos matemáticos surgem como ferramentas no estudo de elementos químicos no solo. O transporte do paclobutrazol foi simulado com o modelo Hydrus1D em dois solos distintos, um Argissolo Amarelo e um Vertissolo do Pólo Petrolina- PE/Juazeiro-BA, localizados na região do Vale do São Francisco. Os objetivos específicos foram: i) calibrar o modelo Hydrus1D, afim de estimar as taxas de decaimento do PBZ na fase sólida (ms) e na fase líquida (ml); ii) analisar a sensibilidade da concentração relativa C/C0 na solução, obtida com o modelo Hydrus1D, dos parâmetros hidrodispersivos do paclobutrazol no modelo, a saber: o coeficiente de transferência de massa (a), a constante de degradação (m), a dispersividade longitudinal (l) e o coeficiente de partição solo-solução (KD); e iii) realizar estudos de casos aproximando a aplicação do PBZ as condições reais de campo durante um período de quatro anos. No estudo de caso, para ambos os solos, avaliou-se a influência da aplicação do Paclobutrazol, ou seja, na profundidade de 10 cm, como condição inicial, e na superfície do solo, como condição de contorno. Em ambos os solos, também foi avaliado a influência do parâmetro n da curva de retenção. A calibração permitiu estimar as taxas de decaimento do PBZ na fase sólida (ms) e na fase líquida (ml). Os valores de ml foram superiores aos valores de ms, estando de acordo com o comportamento da degradação de compostos orgânicos que ocorre principalmente na fase líquida. Globalmente, a análise de sensibilidade mostrou que a concentração relativa máxima (C/C0)máx na solução, obtida com o modelo Hydrus1D, foi sensível a variação percentual positiva dos parâmetros de entrada analisados, a saber: o coeficiente de transferência de massa (a), a constante de degradação (m), a dispersividade longitudinal (l). A concentração relativa máxima (C/C0)máx na solução foi muito sensível a variação do coeficiente de partição solo-solução (KD), sobretudo a variação percentual negativa. Em relação aos estudos de casos, concluiu-se que: 1) a maior mobilidade ocorreu para o Argissolo quando o PBZ foi aplicado na condição de contorno para o tempo de pulso de 7h; e 2) no período estudado não houve um aumento significativo da concentração relativa máxima do soluto
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Nichols, William. "Modeling Performance of an Operational Urban Rain Garden Using HYDRUS-1D." Thesis, Villanova University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10811265.

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Tools for predicting rain garden performance are limited, particularly for predicting seasonal performance. Changes in temperature cause changes in the viscosity of water, infiltration rates, and evapotranspiration rates. A variably-saturated soil model, HYDRUS-1D, was calibrated and validated using observed ponding depth and soil moisture data for the Philadelphia Zoo Rain Garden, owned and operated by the Philadelphia Water Department (PWD). Warm and cold seasons were simulated with typical meteorological data and temperature-adjusted saturated hydraulic conductivity values. Design-storm simulations confirmed that the rain garden is over-performing. Maximum capacity of the system was simulated by increasing the loading ratio until overtopping occurred or ponding remained longer than 24 hours. This study will demonstrate how modeling of an operational urban rain garden offers a realistic picture of performance and could be used as a tool for informing regulations and design.

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Hudepohl, Michael R. "Modeling Stormwater Runoff from Synthetic Turf Fields Using HYDRUS and SWMM." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428066302.

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Meier, Leonie [Verfasser], and Maren [Akademischer Betreuer] Klemm. "Effektivität des Hydrus®-Stents bei Glaukompatienten / Leonie Meier ; Betreuer: Maren Klemm." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/120292560X/34.

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Faúndez, Urbina Carlos Alberto. "Calibración del modelo Hydrus en suelos salinos bajo olivos regados por goteo." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/147890.

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Tesis para optar al Grado de Magíster en Manejo de Suelos y Aguas
Actualmente, la zona entre Copiapó y Santiago está bajo una sequía que genera dificultades en la producción frutícola. Copiapó tiene un clima desértico, con solo 22 mm de precipitación anual promedio, en tanto los suelos pueden ser clasificados como moderadamente salinos a extremadamente salinos, con una conductividad eléctrica (EC) medida en extracto de saturación (CEe) desde 2,5 a 19,1 dS m-1 . Los manejos de agua y sales en los cultivos de olivos han sido hechos sin la apropiada tecnología y supervisión, lo que puede causar una sobrestimación o subestimación del agua aplicada por los agricultores, causando hipoxia o salinización del perfil de suelo. Hay muchas formas de abordar este problema, la mayoría de ellas se enfocan en la resolución de un balance de masa y energía en el continuo suelo-plantaatmósfera. Una forma de resolver este balance es por medio de la simulación numérica con el software HYDRUS, el cual resuelve la ecuación de Richards para flujo de agua y la ecuación Advecto-Dispersiva para flujo de calor y transporte de solutos en el suelo. Por esto se propuso calibrar un balance de agua y solutos con HYDRUS, en una condición de suelo salina con olivos bajo riego por goteo y validarla con FDR dispuestos en la hilera de plantación bajo el sistema de riego. La metodología consideró la instalación de cinco FDR en un suelo estratificado (franco limoso a limo), donde se midió el contenido de agua volumétrico (WC) y la conductividad eléctrica de la solución (CEp). La WC y CEp se utilizaron para comprarlas con los valores simulados por HYDRUS, el cual fue parametrizado con curvas de retención de agua en el suelo, conductividad hidráulica saturada y soluciones inversas para cada horizonte del perfil de suelo. Se evaluó la raíz del error cuadrático medio relativo al promedio (RRMSE) y Nash entre otros estadísticos, como criterios de fiabilidad. Los resultados obtenidos muestran un RRMSE de 13,8% y 29% y un Nash de 0,64 y 0,72 para WC y CEp respectivamente. Estos resultados muestran que HYDRUS, con una calibración previa, es una herramienta alternativa para zonas áridas, donde puede simular el contenido de agua del suelo y la conductividad eléctrica de los poros con alta confiabilidad.
Currently, the zone between Copiapó and Santiago of Chile is under a severe drought, which generates difficulties in the fruit production. Copiapó city in the Atacama Region, presents a desert climate with only 22 mm of average annual rainfall. The soils can be classified as moderately saline to extremely saline, with an electrical conductivity (EC) measured in saturation extract (ECe) from 2.5 to 19.1 dS m-1 . The water and salt management in olive tree orchards in the Copiapó Valley is being done without the appropriate technology and supervision, which may causes a water overestimation by the farmers, causing hypoxia, or conversely a constant salinization of the soil profile. There are many forms to deal with this problem; most of them is focused on the resolution of a mass and energy balance in the continuum soil-plant-atmosphere. One of these methods is the numerical simulation with the software HYDRUS, which solved the Richard’s equation for water flux and the AdvectoDispersive equation for heat and solute transport in the soil. Accordingly, it was proposed to calibrate a water and solute balance with the HYDRUS model in a saline soil condition with olives trees under drip irrigation and to validate it with FDR disposed in the plant row under the drip irrigation system. The methodology considered the installation of five FDR sensors in a layered soil (loam to silty clay loam). It was measured the volumetric water content, (WC) and the solution electrical conductivity (ECp), comparing them with the simulated values from HYDRUS parametrized with soil water retention curve, saturated hydraulic conductivity and inverse solutions of each layer of the soil profile. It was evaluated the relative root mean square error (RRMSE) and Nash, between other statistics, as reliability criteria. The obtained results shown a RRMSE of 13.8% and 29% and a Nash of 0.64 and 0.72 for WC and ECp respectively. These results show that HYDRUS is an alternative tool for arid zones, where it can simulate the soil water content and pore electrical conductivity with high confiability.
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Atmosudirdjo, Aryani. "Simulation of Leachate Generation from a Waste Rock Dump in Kiruna Using HYDRUS-1D." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379225.

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The percolation of water through waste rock dumps at mine sites can lead to the production of a leachate with high concentrations of dissolved metals, sulfate and nitrogen compounds. It is important to understand how water flows in waste rock dumps in order to predict the environmental impact of this leachate on recipients. The dynamics of percolation and leachate discharge are controlled by climatological conditions at the site, where relatively large flows in northern Sweden correspond to snowmelt during late Spring. Rock dumps are often tens of meters in height, resulting in an unsaturated water flow system through heterogeneous material. Hence, the simulation of leachate generation requires an accurate representation of the subsurface materials as well as the flow processes, where water flow in waste rock dumps is dominated by matrix flow with macropore flow being of secondary importance. Matrix flow is rather slow and may thus potentially yield relatively high concentrations of contaminants in the leachate, in response to precipitation and snow melt. This study uses Hydrus-1D to predict leachate generation from a small-scale waste rock dump in Kiruna in terms of discharge magnitude and timing. The 3-dimensional geometry of the waste rock dump is approximated by summing simulations from 1225 one-dimensional columns of different length, with a surface area of 1 m2 each. There are four output parameters that are compared between the model results and measured data: snow accumulation, water content, temperature, and discharge. There are some discrepancies between the model results and field measurements, most likely due to uncertainties in the input parameters (especially waste rock properties), limitations in the Hydrus-1D model (i.e. freeze-thaw dynamics), and assumptions that are used in constructing the conceptual model. For better agreement between model results and measured data, a new modelling approach is recommended, potentially using a different program than Hydrus-1D.
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Pinho, Roque Emmanuel da Costa de. "Teores de água e solutos no solo: desempenho e sensibilidade do modelo Hydrus-1D." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/11/11131/tde-25022010-154643/.

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A preocupação com o destino de produtos químicos e água, aplicados ao solo, tem motivado vários pesquisadores a desenvolverem e aplicarem modelos teóricos, objetivando descrever os processos físicos envolvidos no transporte desses produtos no perfil do solo. Nesse sentido, a presente pesquisa teve como objetivo a aplicação do modelo Hydrus-1D para simulação do movimento da água e dos íons nitrato e potássio, em condições de laboratório, utilizando-se para tal colunas segmentadas preenchidas com dois tipos de solo não-saturado (Latossolo Vermelho Amarelo e Nitossolo Vermelho), bem como avaliar o desempenho e sensibilidade do referido modelo. Para a obtenção dos parâmetros de transporte de cada soluto, foram elaboradas as curvas de distribuição de efluentes (Breakthrough Curves BTC). Os parâmetros de transporte obtidos e as condições de contorno de cada ensaio foram inseridos no modelo Hydrus- 1D para realização das simulações. O desempenho do modelo foi avaliado com base nos parâmetros estatísticos: erro máximo, erro absoluto médio, raiz quadrada do erro médio normalizado, coeficiente de massa residual, coeficiente de determinação, eficiência e índice de concordância de Willmott. A sensibilidade do modelo foi avaliada conforme o método proposto por McCuen e Snyder (1986) e a análise foi aplicada aos parâmetros: fluxo de entrada, condutividade hidráulica do solo saturado, teor de água na saturação, alfa e n (parâmetros de ajuste da curva de retenção), coeficiente de distribuição e dispersividade. Os resultados experimentais mostraram que o deslocamento do íon nitrato acompanhou a frente de molhamento e em relação ao potássio, observou-se uma maior retenção nas camadas superficiais da coluna de solo, para ambos os solos. Pôde-se concluir que o modelo Hydrus-1D foi eficiente para simulações de deslocamento de potássio e água para ambos os solos estudados e mediante a utilização do modelo de equilíbrio para o transporte de solutos no solo, o modelo Hydrus-1D não foi eficiente para simular o deslocamento de nitrato, para ambos os solos. Os procedimentos experimentais para estimativa de parâmetros de transporte, como as curvas de distribuição de efluentes, foram suficientes para descrever a movimentação de potássio no solo, gerando informações de entrada precisas para os modelos de simulação. Para a simulação do deslocamento do íon nitrato, concluiu-se que o modelo Hydrus-1D requer um processo experimental mais detalhado, sendo necessária a estimativa de um maior número de parâmetros de transporte. Em relação à análise de sensibilidade, ao simular os teores de potássio e água no solo, o modelo apresentou maior sensibilidade aos parâmetros teor de água na saturação e fluxo de entrada da solução. Tais parâmetros, portanto, precisam ser determinados com maior precisão. Houve baixa sensibilidade aos parâmetros condutividade hidráulica do solo saturado e dispersividade, para ambos os solos estudados.
The concern about the fate of chemical products and water, applied to the soil, has been motivating several researchers to develop and apply theoretical models, aiming to describe the physical processes involved in the transport of those products in soil profile. The present research had as objective the application of the model Hydrus- 1D for water and solute (nitrate and potassium) simulation profile, in laboratory conditions, using soil columns filled with two types of unsaturated soil (Oxisol (Haplustox) and Hapludox), as well to evaluate the acting and sensitivity of the model. The transport parameters were obtained for each solute by breakthrough curves (BTCs). The transport parameters obtained and the boundary conditions were inserted in the Hydrus-1D model to realize the simulations. The acting of the Hydrus-1D model was evaluated using the statistical indicators: maximum error, mean absolute error, normalized root mean-square error, coefficient of residual mass, determination coefficient, efficiency and Willmott concordance index. The model sensitivity was evaluated by the method proposed by McCuen and Snyder (1986) and applied to the parameters: input flow, soil saturated hydraulic conductivity, water content (saturation point), alpha and n (soil water retention curve parameters), distribution coefficient and dispersivity. The obtained results, experimentally, showed the nitrate displacement following the wetting front and, in relation to the potassium ion, a larger retention was observed at the superficial soil columns layers. Therefore, was possible to conclude that Hydrus-1D model was efficient for both water and potassium displacement simulations, for both studied soils and by the balance model for solute transport in soil, the Hydrus- 1D model was not efficient to simulate the nitrate displacement in both soils. The experimental procedures to estimate transport parameters, by the BTCs, were enough to describe the potassium movement in soil, generating input information necessary to the model simulation. To the simulation of the nitrate displacement, was possible to conclude that the model Hydrus-1D requests a more detailed experimental process, being necessary the estimate of a larger number of transport parameters. In relation to the sensitivity analysis of the Hydrus-1D model, when simulated the content of potassium and water at the soil columns, was observed that the model shows more sensitivity about to the parameters: water content (saturation point) and input flow. This parameters need to be estimated with more precision. There was a low sensitivity to the parameters soil saturated hydraulic conductivity and dispersivity for both studied soils.
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Inforsato, Leonardo. "Determinação das propriedades hidráulicas do solo pelo método de evaporação monitorada por atenuação de radiação gama." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-12112018-141229/.

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Modelos matemáticos são comumente utilizados no estudo da dinâmica da água no solo não-saturado. A principal equação para se quantificar esta dinâmica é a equação diferencial de Richards. Sua solução direta é impossível na maioria dos casos, necessitando de métodos numéricos, dos quais se destaca a utilização das funções de condutividade e de retenção de água de Van Genuchten - Mualem para obtenção da solução numérica. Diante disto, o objetivo deste trabalho foi apresentar um novo método para a obtenção dos parâmetros de Van Genuchten - Mualem, que utiliza a modelagem inversa de dados de teores de água medidos periodicamente e obtidos por experimento de evaporação assistido por atenuação de radiação gama, para a modelagem inversa foi utilizado o software Hydrus-1D. O método foi testado em amostras com diferentes texturas, colhidas em 11 localidades na região de Piracicaba-SP. Dos conjuntos de exemplares analisados, apenas um apresentou resultado insatisfatório, concluindo que o método é válido
Mathematical models are commonly used in studies of water dynamics in unsaturated soil. The main equation to quantify water the dynamics is the differential Richards equation. Its analytical solution is impossible in almost all cases, requiring numerical methods, among which the Van Genuchten - Mualem water conductivity and water retention functions are frequently used to obtain the numerical solution. The objective of this work is to present a new method to obtain the Van Genuchten - Mualem parameters, using the inverse modeling of water content data measured periodically by gamma radiation attenuation in evaporating samples. Hydrus-1D software was used for the inverse modeling. The method was tested in samples with different textures, collected in 11 locations in the region of Piracicaba, state of São Paulo, Brazil. Of the sets of samples analyzed, only one presented an unsatisfactory result, concluding that the method is valid
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Vogel, Mie. "Effects of Model Spin-Up on Simulated Recharge Using the Hydrus-1D Vadose Zone Model." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385590.

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Groundwater is a crucial part of the hydrological cycle and is an important source for drinking water, irrigation and industry, particularly during droughts. With climate change, the hydrological variability is predicted to increase, making predictions for recharge and groundwater storage even more important to implement and to maintain sustainable water use. This study examines the importance of model spin-up in simulating recharge using the Hydrus-1D computer model. The focus is on two previously made Hydrus-1D models that represent end members in climate and hydrology; one which is a natural grassland in a semi-arid climate, while the other is a low impact development (LID) bioswale site in a Mediterranean climate. The main goal of this study is to characterize the range and causes of spin-up behavior as well as to analyze the extent of the effects that the spin-up process has on the recharge simulations. Although there has been some research on spin-up behavior for surface-water models, there is still a knowledge gap regarding the effects of model spin-up on vadose zone models simulating recharge. The initial conditions varied using three parameters for each of the two models: time (3, 15 and 30 years), initial moisture (θ = 0.1, 0.2 and 0.3) and precipitation (25% drier than historical data, historical 30-year data, 25% wetter than historical data). The output from these spin-ups were then used as initial conditions in simulating recharge using the 15-year models. The study found that the impact of spin-up is significant in the natural grassland site where there is a slow response between atmospheric forcings and recharge and where there is a relatively thick vadose zone. Especially spin-up time showed great variability and there is an inverse relationship between spin-up time and magnitude of recharge, where the longer spin-ups had lower recharge rates. Initial water content and precipitation did not result in different recharge amounts for the LID model. Length of spin-up only had very small differences in recharge for the LID models, indicating they are less sensitive to changes in initial spin-up parameters.
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Books on the topic "Hydrus1D"

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Radcliffe, David Elliott. Soil physics with HYDRUS: Modeling and applications. Boca Raton: Taylor & Francis, 2010.

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Radcliffe, David E., and Jiri Simunek. Soil Physics with HYDRUS. CRC Press, 2018. http://dx.doi.org/10.1201/9781315275666.

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Introduction to Soil Physics with HYDRUS: Modeling and Applications. CRC, 2009.

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Heiberger, Thilo Stefan. Simulating the effects of a capillary barrier using the two-dimensional variably saturated flow model SWMS-2D/HYDRUS-2D. 1996.

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Book chapters on the topic "Hydrus1D"

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Laspas, Panagiotis, and Norbert Pfeiffer. "Hydrus Microstent." In Minimally Invasive Glaucoma Surgery, 59–71. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5632-6_5.

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Abstract The Hydrus® Microstent (Ivantis Inc., Irvine, CA, USA) is an 8-mm intracanalicular scaffold microinvasive glaucoma surgery (MIGS) device which reduces intraocular pressure (IOP) by bypassing the trabecular meshwork and by dilating and scaffolding the Schlemm’s canal. Indications for Hydrus Microstent implantation include primary open-angle glaucoma and pseudoexfoliation glaucoma and it can be implanted either in combination with cataract surgery or as a solo procedure. Studies have shown that the Hydrus Microstent lowers IOP to the mid-teens and reduces glaucoma medication use for up to 2 years. Hydrus Microstent implantation is associated with a favorable safety profile, with adverse effects being generally mild, transient, and self-resolving. Clinically significant and long-standing hypotony or other potentially sight-threatening complications have not been described so far with Hydrus Microstent implantation. This chapter summarizes the design, mechanism of action, surgical technique, and clinical outcomes of the Hydrus Microstent, which is a promising long-term treatment modality for patients with mild-to-moderate primary open-angle glaucoma.
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Shareef, Shakeel, Antonio Fea, and Iqbal Ike K. Ahmed. "The Hydrus Micro-stent." In Surgical Innovations in Glaucoma, 171–74. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8348-9_15.

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Ahmed, Ike K., Matthew B. Schlenker, and Jeb Alden Ong. "Cataract Extraction and Hydrus Microstent Implantation." In Operative Dictations in Ophthalmology, 227–30. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-53058-7_47.

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Narayan Sethi, Laxmi, and Sudhindra Nath Panda. "Soil Water Balance Simulation of Rice using HYDRUS-2D and Mass Balance Model." In Modeling Methods and Practices in Soil and Water Engineering, 41–70. Oakville, ON ; Waretown, NJ : Apple Academic Press, [2016] |: Apple Academic Press, 2017. http://dx.doi.org/10.1201/b19987-4.

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Kanda, Edwin Kimutai, Aidan Senzanje, and Tafadzwanashe Mabhaudhi. "Coupling Hydrus 2D/3D and AquaCrop Models for Simulation of Water Use in Cowpea (Vigna Unguiculata (L.) Walp)." In Springer Proceedings in Energy, 53–63. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64715-5_4.

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Bekele, Enguday, Seifu Tilahun, Abebech Beyene, Sisay Asres, Berhanu Geremew, and Haimanot Atinkut. "Soil Water Dynamics on Irrigated Garlic and Pepper Crops Using Hydrus–1D Model in the Lake Tana-Basin, Northwestern Ethiopia." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 193–209. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43690-2_13.

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Reem, Abukmeil, Guizani Mokhtar, Ito Ryusei, and Funamizu Naoyuki. "Assessment of Different Irrigational Practices on Managing the Nitrogen Loss into the Groundwater Using HYDRUS-1D Numerical Software Gaza Strip as a Case Study—Palestine." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 653–57. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_195.

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"Chapter Transient Water Flow in Soils." In Soil Physics with HYDRUS, 197–262. CRC Press, 2018. http://dx.doi.org/10.1201/9781315275666-10.

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"Chapter Solute Transport." In Soil Physics with HYDRUS, 263–360. CRC Press, 2018. http://dx.doi.org/10.1201/9781315275666-11.

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"Chapter Soil Solid Phase." In Soil Physics with HYDRUS, 15–30. CRC Press, 2018. http://dx.doi.org/10.1201/9781315275666-6.

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Conference papers on the topic "Hydrus1D"

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Kleissl, Jan, H. Moreno, J. M. H. Hendrickx, and J. Simunek. "HYDRUS simulations of soil surface temperatures." In Defense and Security Symposium, edited by Russell S. Harmon, J. Thomas Broach, and John H. Holloway, Jr. SPIE, 2007. http://dx.doi.org/10.1117/12.719445.

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Thomas, K., P. Beech, S. Brown, J. Buck, J. Burscough, S. Clough, I. Crotch, et al. "Status of the AWE Hydrus IVA fabrication." In 2011 IEEE Pulsed Power Conference (PPC). IEEE, 2011. http://dx.doi.org/10.1109/ppc.2011.6191639.

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Corcoran, P., V. Bailey, B. Whitney, P. Sanders, K. Hanzel, R. Broff, I. Smith, et al. "LTGS Performance and Down-Selection for the Hydrus IVA PFL." In 2007 IEEE Pulsed Power Plasma Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4345734.

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Liang, Zhan, Jing Zhang, and Binbin Guo. "Research on the Dynamic Soil Moisture Contents using Hydrus-3D model." In 2015 3rd International Conference on Advances in Energy and Environmental Science. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icaees-15.2015.138.

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"HYDRUS-1D Simulations of potassium transport in a saline tropical soil." In 2015 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2015. http://dx.doi.org/10.13031/aim.20152189276.

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LEVIEN, S. L. A., and L. E. V. ARRUDA. "SIMULAÇÃO DE FAIXA MOLHADA NA IRRIGAÇÃO POR GOTEJAMENTO SUPERFICIAL USANDO HYDRUS 2D." In IV Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/ESALQ-USP/ABID/UFRB/INCT-EI/INCTSal/INSTITUTO FUTURE, 2017. http://dx.doi.org/10.7127/iv-inovagri-meeting-2017-res2340270.

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White, William J., and Jonathan M. Malzone. "ONE-DIMENSIONAL SOIL MOISTURE FLOW MODELING OF RIDGETOP WETLANDS USING HYDRUS-1D." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356235.

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Crotch, Ian, Ken Thomas, K. Barry, P. F. Beech, M. Bockle, J. Bonnell, S. G. Clough, et al. "Pulsed power driven flash X-ray sources for the Hydrus project at AWE." In 2007 IEEE International Pulsed Power Plasma Science Conference (PPPS 2007). IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4652377.

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Thomas, Kenneth J. "Pulsed Power Driven Flash X-ray Sources for the Hydrus Project at AWE." In 2007 IEEE Pulsed Power Plasma Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4345987.

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Yu, M., Z. Hu, B. Liu, and K. Zhang. "Numerical Simulations of Soil Water Dynamics under Surface Drip Irrigation Using HYDRUS-2D." In International Workshop on Environmental Management, Science and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007559602600265.

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