Log in

Relevant bibliographies by topics / Unsaturated hydraulic conductivity

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Unsaturated hydraulic conductivity'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Unsaturated hydraulic conductivity.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Unsaturated hydraulic conductivity"

1

Li, X., L. M. Zhang, and D. G. Fredlund. "Wetting front advancing column test for measuring unsaturated hydraulic conductivity." Canadian Geotechnical Journal 46, no. 12 (December 2009): 1431–45. http://dx.doi.org/10.1139/t09-072.

Full text

Abstract:

Unsaturated hydraulic conductivity is the primary soil parameter required when performing seepage analyses for unsaturated–saturated soil systems. Unsaturated hydraulic conductivity is also one of the most difficult parameters to measure because of the time involved and the limited suction measurement range (e.g., 0∼1500 kPa in a test using the steady-state method). In this study, a new wetting front advancing method was developed for measuring unsaturated hydraulic conductivity. The wetting front advancing method simulates and monitors a soil wetting process through a large-scale soil column. A new interpretative procedure was developed to calculate the unsaturated hydraulic conductivity based on the monitored water content, suction, and wetting front advancing velocity. The proposed technique is used to measure the unsaturated hydraulic conductivities of five soils, which vary from gravel to clay. The results indicate that the proposed technique is time-saving (i.e., requires several days for a complete test) and is applicable over wide ranges of suctions and unsaturated hydraulic conductivities. The measured unsaturated hydraulic conductivity using the wetting front advancing method is similar to that obtained using the instantaneous profile method, with the latter covering narrower ranges of soil suction and hydraulic conductivity.

APA, Harvard, Vancouver, ISO, and other styles

2

Singh, D. N., and Sneha J. Kuriyan. "Estimation of hydraulic conductivity of unsaturated soils using a geotechnical centrifuge." Canadian Geotechnical Journal 39, no. 3 (June 1, 2002): 684–94. http://dx.doi.org/10.1139/t02-013.

Full text

Abstract:

A saturated silty soil sample is centrifuged in a geotechnical centrifuge to create an unsaturated state. The change in water content of the soil sample is recorded at different points along the length of the sample to obtain the water-content profile, which is then used to obtain the unsaturated hydraulic conductivity of the soil sample. These hydraulic conductivity values are compared with those obtained and reported by previous researchers by conducting accelerated falling-head tests on this soil sample in a centrifuge. The study demonstrates the use of centrifugation techniques to obtain hydraulic conductivities of unsaturated soils.Key words: silty soil, saturated soil, unsaturated soil, hydraulic conductivity, centrifuge testing.

APA, Harvard, Vancouver, ISO, and other styles

3

Holland, D. F., M. Yitayew, and A. W. Warrick. "Measurement of Subsurface Unsaturated Hydraulic Conductivity." Journal of Irrigation and Drainage Engineering 126, no. 1 (January 2000): 21–27. http://dx.doi.org/10.1061/(asce)0733-9437(2000)126:1(21).

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

OTHMER, HEINRICH, BERND DIEKKRÜGER, and MIROSLAV KUTILEK. "BIMODAL POROSITY AND UNSATURATED HYDRAULIC CONDUCTIVITY." Soil Science 152, no. 3 (September 1991): 139–50. http://dx.doi.org/10.1097/00010694-199109000-00001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Schwaerzel, K., and H. P. Bohl. "An easily installable groundwater lysimeter to determine waterbalance components and hydraulic properties of peat soils." Hydrology and Earth System Sciences 7, no. 1 (February 28, 2003): 23–32. http://dx.doi.org/10.5194/hess-7-23-2003.

Full text

Abstract:

Abstract. A simple method for the installation of groundwater lysimeters in peat soils was developed which reduces both time and financial effort significantly. The method was applied on several sites in the Rhinluch, a fen peat land 60 km northwest of Berlin, Germany. Over a two-year period, upward capillary flow and evapotranspiration rates under grassland with different groundwater levels were measured. The installation of tensiometers and TDR probes additionally allowed the in situ determination of the soil hydraulic properties (water retention and unsaturated hydraulic conductivity). The results of the measurements of the unsaturated hydraulic conductivity demonstrate that more than one single method has to be applied if the whole range of the conductivity function from saturation to highly unsaturated is to be covered. Measuring the unsaturated conductivity can be done only in the lab for an adequately wide range of soil moisture conditions. Keywords: peat soils, soil hydraulic properties, evapotranspiration, capillary flow, root distribution, unsaturated zone

APA, Harvard, Vancouver, ISO, and other styles

6

Villagra-Mendoza, Karolina, and Rainer Horn. "Effect of biochar on the unsaturated hydraulic conductivity of two amended soils." International Agrophysics 32, no. 3 (July 1, 2018): 373–78. http://dx.doi.org/10.1515/intag-2017-0025.

Full text

Abstract:

Abstract Water and solute transports in the vadose zone depend on the distribution, size, shape and configuration of the pores. They affect the soil hydraulic properties and, consequently, the directly related processes such as water storage, infiltration, groundwater recharge, and also erosion and runoff. Soils amended with biochar are prompt to improve their physical and hydraulic properties. Biochar addition alters not only porosity, the water retention pattern and the derived pore distribution, but also the hydraulic conductivity under saturated and unsaturated conditions. In our work, two different doses (2.5 and 5% dry wt.) were added to two textured soils (sand and sandy loam). The unsaturated hydraulic conductivity and saturated hydraulic conductivity were measured under laboratory conditions. The obtained results show the positive effect of biochar on the hydraulic functions. For the sandy soil, the higher the dose of biochar, the more constant and relatively higher is the hydraulic conductivity up to - 40 kPa. At less negative matric potentials (< -10 kPa), the unamended sandy loam soil showed a slightly higher unsaturated hydraulic conductivity, compared to the amended soils. These results underline that biochar addition enhances the transport of water under unsaturated conditions by reducing the formation of larger pores while also intensifying the finer inter-particle pore formation.

APA, Harvard, Vancouver, ISO, and other styles

7

Singh, D. N., and Sneha J. Kuriyan. "Estimation of unsaturated hydraulic conductivity using soil suction measurements obtained by an insertion tensiometer." Canadian Geotechnical Journal 40, no. 2 (April 1, 2003): 476–83. http://dx.doi.org/10.1139/t02-112.

Full text

Abstract:

To estimate the unsaturated soil hydraulic conductivity of a silty soil, an insertion tensiometer has been used for measuring its suction corresponding to different water contents. These suction values have been used for developing the soil-water characteristic curve (SWCC). The obtained SWCC has been compared with the trends predicted by various fits available in the literature. Further, with the help of the obtained SWCC, the unsaturated soil hydraulic conductivity has been estimated. The study demonstrates the usefulness of insertion tensiometers for measuring soil suction and for estimating its hydraulic conductivity.Key words: silty soil, suction, insertion tensiometer, soil-water characteristic curve, unsaturated soil hydraulic conductivity.

APA, Harvard, Vancouver, ISO, and other styles

8

McDougall, J. R., and I. C. Pyrah. "Simulating transient infiltration in unsaturated soils." Canadian Geotechnical Journal 35, no. 6 (December 1, 1998): 1093–100. http://dx.doi.org/10.1139/t98-059.

Full text

Abstract:

Transient responses to various infiltration events have been examined using an unsaturated flow model. Numerical simulations reveal a range of infiltration patterns which can be related to the ratio of infiltration rate to unsaturated hydraulic conductivity. A high value of this ratio reflects a prevailing hydraulic conductivity which cannot readily redistribute the newly infiltrated moisture. Moisture accumulates in the near-surface region before advancing down through the soil as a distinct wetting front. In contrast, low values of the ratio of rainfall to unsaturated hydraulic conductivity show minimal moisture accumulation, as the relatively small volumes of infiltrating moisture are readily redistributed through the soil profile.Key words: numerical modelling, infiltration, unsaturated soil, soil suction, groundwater.

APA, Harvard, Vancouver, ISO, and other styles

9

Tao, Gaoliang, Xueliang Zhu, Jianchao Cai, Henglin Xiao, Qingsheng Chen, and Yin Chen. "A Fractal Approach for Predicting Unsaturated Hydraulic Conductivity of Deformable Clay." Geofluids 2019 (May 2, 2019): 1–9. http://dx.doi.org/10.1155/2019/8013851.

Full text

Abstract:

The relative hydraulic conductivity is one of the key parameters for unsaturated soils in numerous fields of geotechnical engineering. The quantitative description of its variation law is of significant theoretical and technical values. Parameters in a classical hydraulic conductivity model are generally complex; it is difficult to apply these parameters to predict and estimate the relative hydraulic conductivity under deformation condition. Based on the fractal theory, a simple method is presented in this study for predicting the relative hydraulic conductivity under deformation condition. From the experimental soil-water characteristic curve at a reference state, the fractal dimension and air-entry value are determined at a reference state. By using the prediction model of air-entry value, the air-entry values at the deformed state are then determined. With the two parameters determined, the relative hydraulic conductivity at the deformed state is predicted using the fractal model of relative hydraulic conductivity. The unsaturated hydraulic conductivity of deformable Hunan clay is measured by the instantaneous profile method. Values of relative hydraulic conductivity predicted by the fractal model are compared with those obtained from experimental measurements, which proves the rationality of the proposed prediction method.

APA, Harvard, Vancouver, ISO, and other styles

10

Song, Young-Suk. "Estimation on Unsaturated Hydraulic Conductivity Function of Jumoonjin Sand for Various Relative Densities." Journal of the Korean Society of Civil Engineers 33, no. 6 (2013): 2369. http://dx.doi.org/10.12652/ksce.2013.33.6.2369.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Unsaturated hydraulic conductivity"

1

Hussen, Akif Ali. "Measurement of Unsaturated Hydraulic Conductivity in the Field." FIND on the Web, 1991.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hussen, Akif Ali 1957. "Measurement of Unsaturated Hydraulic Conductivity in the Field." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/191170.

Full text

Abstract:

Unsaturated hydraulic conductivity was measured using four different methods. Tension permeameters were used to measure unsaturated hydraulic conductivity in the field, using a single disc method, which depends on the measurements of sorptivity, steady state flow rate, initial and final water content (White and Perroux, 1987, 1989). Also, a double disc method was used which utilizes Wooding's (1968) equation for two different disc radii at the same tension for steady state flow rates. Undisturbed and disturbed soil cores were used to measure unsaturated hydraulic conductivity in the lab, using water retention curves with van Genuchten's equations. There were no significant differences in the mean of hydraulic conductivity between single and double disc methods in all the tensions used (0, 5, 10 and 15 cm). There were significant differences between the field methods and undisturbed soil cores in zero cm tension, and disturbed soil cores in 10 and 15 cm tension. The effect of land preparation on the unsaturated hydraulic conductivity was studied using the double disc method. Tilling has significant effects on the unsaturated hydraulic conductivity at all tensions used. The spatial variation of unsaturated hydraulic conductivity and steady state flow in different tensions using the double disc method was studied. We found exponential variogram models for unsaturated hydraulic conductivity at 5, 10 and 15 cm tensions and a random model for zero cm tension. Also, exponential models were best fitted for steady state flow corresponding to pores radii of 0.03 - 0.015 cm, 0.015 - 0.010 cm and steady state flow at 10 cm tension. A Michaelis-Menton model was used for steady state flow at 5 cm and 15 cm tension. Disc permeameters were also used to add 5 cm depth of water, bromide and dye solution at 0, 5, 10 and 15 cm tensions with three replicates. A comparison was made between field data and simulated model under the same boundary and initial conditions as in the field. Results showed that the water and bromide move deeper than the prediction of the simulated model in all tensions used. The differences were larger between simulated model and field data for both water and bromide concentrations in the lower tension and smaller in the higher tension as a result of elimination of some preferential flow paths. An equation was developed for cumulative infiltration valid for both small and large time. The parameters calculated using the developed equation closely matched the measured infiltration, and fit better than a three term series similar to the Philip equation for one-dimensional flow.

APA, Harvard, Vancouver, ISO, and other styles

3

Harvey, Donald John 1951. "The effective hydraulic conductivity of unsaturated layered sands." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/192009.

Full text

Abstract:

Accurate estimates of field-scale hydraulic conductivities of unsaturated heterogeneous soils are very difficult to obtain. In the present study, various approaches to determining effective conductivity values for heterogeneous sands are compared with laboratory measurements. The unsaturated hydraulic conductivity, K(Ψ), of two homogeneous sands and one layered sand composed of the two homogeneous sands was measured using the steady-state flux control method. A van Genuchten model and an exponential model were fitted to the data. Various means of the homogeneous sand fitted K(Ψ) curves were compared with the layered sand K(Ψ) data using a direct averaging approach. The observed suction head variance, effective hydraulic conductivity, and the anisotropy were compared with expressions developed from stochastic theory. The results qualitatively support the stochastic approach. The outcome of the direct averaging approach was inconclusive however. Additional laboratory and field experimentation is needed.

APA, Harvard, Vancouver, ISO, and other styles

4

Špongrová, Kamila. "Design of an automated tension infiltrometer for unsaturated hydraulic conductivity measurement." Thesis, Cranfield University, 2006. http://hdl.handle.net/1826/1420.

Full text

Abstract:

A tension infiltrometer for field use, where both water level changes measurement and tension settings could be automated, was built in-house. Differential pressure transducers were used to automate the water level measurement in the reservoir. The Mariotte bottle was automated by a set of solenoid valves which were connected via tubing to pre-defined depths in the Mariotte bottle. Based on design parameters tested in the laboratory (sensor sensitivity, water reservoir diameter, and bubbling rate) three identical tension infiltrometers connected to a single Mariotte bottle were built. A new reservoir system made of two plexiglass tubes of different diameter slotted in each other was found to reduce the measurement fluctuations caused by the disturbance created to rising bubbles in the reservoir. The new system was tested on a uniform sandy loam profile prepared in the soil bin laboratory and different analytical and numerical data analysis methods were compared. The measured steady state data were used to determine K(h) at different suctions using the analytical method proposed by Reynolds and Elrick (1991). The K(h) points obtained were fitted with the van Genuchten’s equation (van Genuchten, 1980) using the RETC program to calculate the best fit parameters Ks,  and n. These parameters were used as initial estimates of the soil hydraulic parameters in the numerical models HYDRUS 1D and 2D, in which transient cumulative flow data was used to determine the soil hydraulic functions via inverse modelling. The analysis of variance determined significantly higher K(h) values calculated by HYDRUS 1D while the other methods did not differ from each other. Finally, the tension infiltrometer was used in the field on a sandy loam soil to characterise five different tillage treatments (conventional plough, shallow plough, minimum tillage, direct drill, and no-tillage). The effect of wheel traffic was also evaluated by measuring the infiltration rates in the wheel-marks. The fully automated system allowed the measurement of infiltration rates for 8 tensions in triplicate per day with hardly any human intervention apart for refilling the reservoir. The results show that the tillage practices and wheel-traffic have a significant influence on the soil hydraulic function K(h).

APA, Harvard, Vancouver, ISO, and other styles

5

Hosseini, Siahdashti Seyed Mohammad Javad. "Inverse modelling of desorption tests to establish the hydraulic conductivity of unsaturated sands." Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25323.

Full text

Abstract:

Conductivité hydraulique non saturée est un paramètre important pour caractériser le comportement des sols non saturés. Ce paramètre peut être utilisé pour modéliser l'écoulement de l'eau dans les sols. Le défaut de mesure ou d'estimation de ce paramètre avec une précision fiable peut causer des incidents catastrophiques. La mesure de la conductivité hydraulique des sols non saturés peut être longue et coûteuse. Des méthodes directes et indirectes peuvent être utilisées pour établir ce paramètre. Dans cette étude, en vue de réduire le temps et le coût de la mesure de la conductivité hydraulique des sols non saturés nécessaires par les méthodes directes, la modélisation inverse a été utilisée comme une méthode indirecte pour estimer ce paramètre. Des essais de laboratoire ont été effectués pour trouver la courbe de rétention d'eau des différents échantillons de sol étudié. Les résultats expérimentaux obtenus ont été utilisés pour effectuer la modélisation inverse, et la conductivité hydraulique non saturée de chaque échantillon a été estimé.
Unsaturated hydraulic conductivity is an important parameter to characterize unsaturated soils behaviour. This parameter can be used to model flow of water in soils. Failure in measuring or estimating this parameter with a reliable precision can cause catastrophic incidents. Measuring unsaturated hydraulic conductivity can be expensive and time consuming. Direct and indirect methods can be used to determine this parameter. In this study, in order to decrease the time and the expense of measuring unsaturated hydraulic conductivity by direct methods, inverse modelling was used as an indirect method to estimate this parameter. Some laboratory tests were performed to find water retention curve of different samples of the studied soil. Obtained experimental results were used to perform inverse modelling, and unsaturated hydraulic conductivity of each sample was estimated.

APA, Harvard, Vancouver, ISO, and other styles

6

Yeh, Tian-Chyi J., Ming Ye, and Raziuddin Khaleel. "Estimation of effective unsaturated hydraulic conductivity tensor using spatial moments of observed moisture plume." Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/615768.

Full text

Abstract:

Knowledge of unsaturated zone hydraulic properties is critical for many environmental and engineering applications. Various stochastic methods have been developed during the past two decades to estimate the effective unsaturated hydraulic properties. Independent of these stochastic methods, we develop in this paper a practical approach to estimate the three-dimensional (3 -D) effective unsaturated hydraulic conductivity tensor using spatial moments of 3-D snapshots of a moisture plume under transient flow conditions. approach hydraulic hydraulic Application of the new to a field site in southeastern Washington State yields an effective unsaturated conductivity tensor that exhibits moisture- dependent anisotropy. The effective conductivities compare well with laboratory- measured unsaturated hydraulic conductivity data from small core samples; they also reproduce the general behavior of the observed moisture plume at the site. We also define a moisture diffusivity length concept which we use in conjunction with estimated correlation scales of the geological media at the field site to explain deviations between the observed and simulated plumes based on the derived effective hydraulic properties.

APA, Harvard, Vancouver, ISO, and other styles

7

Van, Vuuren Hein. "Unsaturated flow through permeable pavements : an experimental study." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/75555.

Full text

Abstract:

Permeable Interlocking Concrete Pavements (PICP) have seen increased popularity in the principles of Water Sensitive Urban Design and Sustainable Drainage Systems in recent years. To address certain design queries that still existed in industry, a two-year experimental study was conducted. It entailed the construction of an Infiltration Table Apparatus and subjecting a representative volume of PICP to hydraulic testing within it. The study aimed at determining the controls of the flow of water into and through these pavements, the effect of variations in construction materials and incline on them, the validity of the hydraulic testing methods currently being applied to them in industry and lastly, to inform on their infiltration rates. A host of permeability data for PICP was gained and it was found that both the choice of materials and the incline on which PICP are constructed, can change their hydraulic properties drastically. In general, the selection of lower permeability materials in the surface portion of the layer works decreased the overall permeability of the pavement, while increases in inclines did the same. In addition, it was found that field investigation techniques require revision and further innovation before they can be effectively applied to PICP.
Dissertation (MSc)--University of Pretoria, 2019.
Bosun Brick (Pty) Ltd.
Geology
MSc
Unrestricted

APA, Harvard, Vancouver, ISO, and other styles

8

Cuceoglu, Faik. "An Experimental Study on Soil Water Characteristics and Hydraulic Conductivity of Compacted Soils." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73673.

Full text

Abstract:

The importance of applying unsaturated soil mechanics concepts to geotechnical engineering design has been widely recognized. Soil water characteristic curve (SWCC) and hydraulic conductivity function (HCF) are vital soil properties that govern engineering behavior of unsaturated soils. In this study, a transient water release and imbibitions method (TRIM) is used to measure the SWCC and HCF under drying and wetting states, which accommodates integrated experimental and modeling techniques. The results of saturated hydraulic conductivity tests through flexible wall method are then used as input parameters for simulating experimental data. In general, the model provides a satisfactory fit to experimental data. Soil water characteristic curves (SWCCs) and hydraulic conductivity functions (HCFs) are presented for a variety of soils that were prepared at different molding water contents and compactive efforts. The influences of dry density, molding water content, and hysteresis have been investigated. Dry density affects soil-water characteristic in terms of its air-entry value (AEV), rate of drying, and size of the hysteresis loop. The test results indicate that the SWCC and HCF obtained in terms of volumetric water content is more sensitive to the changes in dry density than molding water content. Based on cohesive soil results, some statistical relations are proposed to estimate wetting-path SWCC and HCF parameters from more easily measured drying curves. Changes in the van Genuchten's fitting parameters and residual volumetric water content are investigated for both drying and wetting conditions, with changes in the kaolin clay content.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

9

Karczynski, Adam Michael. "Measuring Hydraulic Conductivity of Variably-Saturated Soils at the Hectometer Scale Using Cosmic-Ray Neutrons." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/323446.

Full text

Abstract:

Hydraulic conductivity of variably-saturated soils is critical to understanding processes at the land surface. Yet measuring it over an area comparable to the resolution of land-surface models is fraught because of its strong spatial and temporal variations, which render point measurements nearly useless. We derived unsaturated hydraulic conductivity at the horizontal scale of hectometers and the vertical scale of decimeters by analyzing trends in soil moisture measured using the cosmic-ray neutron method. The resulting effective hydraulic conductivity remains close to its value at saturation over approximately half of the saturation range and then plummets. It agrees with the aggregate of 36 point measurements near saturation, but becomes progressively higher at lower water contents; the difference is potentially reconcilable by upscaling of point measurements. This study shows the feasibility of the cosmic-ray method, highlights the importance of measurement scale, and provides a route toward better understanding of land-surface processes.

APA, Harvard, Vancouver, ISO, and other styles

10

Salač, Jan. "Stanovení hydraulických charakteristik půdy ve vybraném zájmovém území." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372323.

Full text

Abstract:

The diploma thesis is focused on issues of measurement and evaluation of hydraulic characteristics of soil. In the literary research, the definitions of hydraulic conductivity and retention curve of soil moisture, their measurements in laboratory and field conditions and the prediction of these characteristics by using of pedotransfer functions. In the practical part of the diploma thesis, an evaluation of the hydraulic conductivity of soil from the experimental areas near the village Bohaté Málkovice. Two-cylindrical and mini-disc infiltration meters were used for field measurements, and a constant-gradient permeameter was used in the laboratory. Physical and empirical equations were used to evaluate the hydraulic conductivity. The results were processed numerically, tabulated and then compared.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Unsaturated hydraulic conductivity"

1

Chemeda, Desalegn. A study of unsaturated hydraulic conductivity of soils as determined by aid of TDR. Dublin: University College Dublin, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Keith, Cassel D., ed. Physical characteristics of soils of the southern region: Summary of in situ unsaturated hydraulic conductivity. Raleigh, N.C: North Carolina State University, 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Unsaturated hydraulic conductivity"

1

Klute, A. "Laboratory Measurement of Hydraulic Conductivity of Unsaturated Soil." In Agronomy Monographs, 253–61. Madison, WI, USA: American Society of Agronomy, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/agronmonogr9.1.c16.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Mualem, Yechezkel. "Hydraulic Conductivity of Unsaturated Soils: Prediction and Formulas." In SSSA Book Series, 799–823. Madison, WI, USA: Soil Science Society of America, American Society of Agronomy, 2018. http://dx.doi.org/10.2136/sssabookser5.1.2ed.c31.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Mirzaii, Ali, Seyyed Shahaboddin Yasrobi, and Nasser Khalili. "Experimental Investigation of Hydraulic Conductivity in Unsaturated Compressible Soils." In Unsaturated Soils: Research and Applications, 205–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31116-1_28.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Matias, Paulo, Francisco Nunes Correia, and Luís Santos Pereira. "Influence of Spatial Variability of Saturated Hydraulic Conductivity on the Infiltration Process." In Unsaturated Flow in Hydrologic Modeling, 455–67. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2352-2_17.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Askarinejad, Amin, Alexander Beck, Francesca Casini, and Sarah M. Springman. "Unsaturated Hydraulic Conductivity of a Silty Sand with the Instantaneous Profile Method." In Unsaturated Soils: Research and Applications, 215–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31343-1_27.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Miller, Stanley M. "Geostatistical Simulation for Upscaling Field Measurements of Unsaturated Hydraulic Conductivity." In Geostatistics Wollongong’ 96, 1098–111. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5726-1_40.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Teixeira, Wenceslau Geraldes, Götz Schroth, Jean Dalmo Marques, and Bernd Huwe. "Unsaturated Soil Hydraulic Conductivity in the Central Amazon: Field Evaluations." In Application of Soil Physics in Environmental Analyses, 283–305. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06013-2_13.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Chen, Tian, Majid Sedighi, Andrey Jivkov, and Suresh C. Seetharam. "Unsaturated Hydraulic Conductivity of Compacted Bentonite: Revisit of Microstructure Effects." In Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2, 544–50. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2224-2_67.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Allred, B., and G. O. Brown. "Surfactant-Induced Reductions of Saturated Hydraulic Conductivity and Unsaturated Diffusivity." In ACS Symposium Series, 216–30. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/bk-1995-0594.ch016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Green, R. E., L. R. Ahuja, and S. K. Chong. "Hydraulic Conductivity, Diffusivity, and Sorptivity of Unsaturated Soils: Field Methods." In SSSA Book Series, 771–98. Madison, WI, USA: Soil Science Society of America, American Society of Agronomy, 2018. http://dx.doi.org/10.2136/sssabookser5.1.2ed.c30.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Unsaturated hydraulic conductivity"

1

Kazimoglu, Y. K., J. R. McDougall, and I. C. Pyrah. "Unsaturated Hydraulic Conductivity of Landfilled Waste." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)127.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Sriboonlue, V., K. Srisuk, S. Konyai, and N. Khetkratok. "Unsaturated Hydraulic Conductivity for Upward Flow in Soil." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Lisboa, Rafael Luis Lobato, Roberto F. de Azevedo, and Rodrigo Martins Reis. "Residual Soil Hydraulic Conductivity Determination Using Field and Laboratory Tests." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)130.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Nishimura, T., Y. Murasawa, and T. Okami. "Estimating Air-Water Hydraulic Conductivity Using Soil-Water Characteristic Curve." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)133.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Dell'Avanzi, Eduardo. "Comparison Between Predicted and Measured Hydraulic Conductivity of an Unsaturated Soil." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)126.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Rojas, J. C., and L. M. Salinas. "Determination of Lean Clay Hydraulic Conductivity Function at Three Hierarchical Levels." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)132.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Sugii, T. "Predicting the Hydraulic Conductivity of Unsaturated Soils from a Soil Moisture Profile." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Pedrosa, J. S., F. N. Cunha, N. F. Silva, M. B. Teixeira, F. A. L. Soares, and V. M. Vidal. "UNSATURATED HYDRAULIC CONDUCTIVITY OF A DYSTROPHIC OXISOL CULTIVATED WITH SUGARCANE." In III Inovagri International Meeting. Fortaleza, Ceará, Brasil: INOVAGRI/INCT-EI, 2015. http://dx.doi.org/10.12702/iii.inovagri.2015-a163.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Bhaskar, Puneet, Burak Boluk, Leila Mosadegh, Aritra Banerjee, and Anand J. Puppala. "Effect of Fines on Hysteretic Hydraulic Conductivity of Unsaturated Soil." In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482827.037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Ichola, I. Alimi, and L. Gaidi. "Hydraulic Conductivity and Pollutant Dispersion Coefficient Assessment During Leachate Flow in Unsaturated Clay." In Fourth International Conference on Unsaturated Soils. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40802(189)129.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Unsaturated hydraulic conductivity"

1

Rockhold, M. L., M. J. Fayler, and G. W. Gee. Characterization of unsaturated hydraulic conductivity at the Hanford Site. Office of Scientific and Technical Information (OSTI), July 1988. http://dx.doi.org/10.2172/6970088.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Gribb, Molly M. Hydraulic Conductivity Measurement in Unsaturated Soils with a Modified Cone Penetrometer. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada369932.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Conca, J., and T. J. Mockler. Measurement of unsaturated hydraulic conductivity in the Bandelier Tuff at Los Alamos. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/245577.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Flach, G., K. Dixon, F. Smith, and R. Nichols. CHARACTERIZATION OF UNSATURATED HYDRAULIC CONDUCTIVITY IN FRACTURED MEDIA USING THE MULTISTEP OUTFLOW METHOD. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1182714.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Conca, J. L. Measurement of unsaturated hydraulic conductivity and chemical transport in Yucca Mountain Tuff: Milestone Report 3044-WBS1.2.3.4.1.4.1. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/140400.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Jury, William A., and David Russo. Characterization of Field-Scale Solute Transport in Spatially Variable Unsaturated Field Soils. United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568772.bard.

Full text

Abstract:

This report describes activity conducted in several lines of research associated with field-scale water and solute processes. A major effort was put forth developing a stochastic continuum analysis for an important class of problems involving flow of reactive and non reactive chemicals under steady unsaturated flow. The field-scale velocity covariance tensor has been derived from local soil properties and their variability, producing a large-scale description of the medium that embodies all of the local variability in a statistical sense. Special cases of anisotropic medium properties not aligned along the flow direction of spatially variable solute sorption were analysed in detail, revealing a dependence of solute spreading on subtle features of the variability of the medium, such as cross-correlations between sorption and conductivity. A novel method was developed and tested for measuring hydraulic conductivity at the scale of observation through the interpretation of a solute transport outflow curve as a stochastic-convective process. This undertaking provided a host of new K(q) relationships for existing solute experiments and also laid the foundation for future work developing a self-consistent description of flow and transport under these conditions. Numerical codes were developed for calculating K(q) functions for a variety of solute pulse outflow shapes, including lognormal, Fickian, Mobile-Immobile water, and bimodal. Testing of this new approach against conventional methodology was mixed, and agreed most closely when the assumptions of the new method were met. We conclude that this procedure offers a valuable alternative to conventional methods of measuring K(q), particularly when the application of the method is at a scale (e.g. and agricultural field) that is large compared to the common scale at which conventional K(q) devices operate. The same problem was approached from a numerical perspective, by studying the feasibility of inverting a solute outflow signal to yield the hydraulic parameters of the medium that housed the experiment. We found that the inverse problem was solvable under certain conditions, depending on the amount of noise in the signal and the degree of heterogeneity in the medium. A realistic three dimensional model of transient water and solute movement in a heterogeneous medium that contains plant roots was developed and tested. The approach taken was to generate a single realization of this complex flow event, and examine the results to see whether features were present that might be overlooked in less sophisticated model efforts. One such feature revealed is transverse dispersion, which is a critically important component in the development of macrodispersion in the longitudinal direction. The lateral mixing that was observed greatly exceeded that predicted from simpler approaches, suggesting that at least part of the important physics of the mixing process is embedded in the complexity of three dimensional flow. Another important finding was the observation that variability can produce a pseudo-kinetic behavior for solute adsorption, even when the local models used are equilibrium.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!