نتایج جستجو برای: mualem

تعداد نتایج: 101  

Journal: :Computational Geosciences 2022

We propose several numerical approaches building on upstream mobility two-point flux approximation finite volumes to solve Richards’ equation in domains made of rock-types. Our study encompasses four different schemes corresponding ways approximate the nonlinear transmission condition systems arising at interface between rocks consisting continuity pressure and fluxes, as well resolution strate...

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Journal: :IFAC-PapersOnLine 2021

Green roofs are a sustainable solution to manage water runoff from rain events in urban areas. Modeling hydrological phenomenon of green is challenging because the difficulties characterize soil parameters, inducing uncertainties on these parameters. Soil parameter spread model and need be analysed better understand dynamics retention. For this purpose, retention capacity represented by Van Gen...

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2013
Marcel Bawindsom Kébré Fabien Cherblanc François Ouédraogo Jean-Claude Bénet François Zougmoré

The unsaturated soil hydraulic properties (the soil water characteristic and relative permeability curves) are key hydrodynamic parameters in the fields of soil science and civil engineering. Because of the strong dependency of these properties on water content, their determination is subject to considerable experimental and numerical problems. Difficulties increase when the soil approaches ove...

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ژورنال: علوم آب و خاک 2014
بای بوردی, محمد , نوری, میلاد, همایی, مهدی,

In order to assess hydraulics of LNAPLs in soil, the soil retention curves of petroleum and water were both determined through hanging column method. And, the hydraulic conductivity of petroleum and water were determined by steady head method. The water and petroleum hydraulic conductivities were 7.27 and 57.84 cm.day-1, respectively. The soil retention parameters were obtained based on van Gen...

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Journal: :Water Resources Research 1978

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1995
Glenn A. Williams Michael D. Tocci

Capillary pressure-saturation-relative permeability relations described using the van Genuchten and Mualem models for non-uniform porous media lead to numerical convergence diiculties when used with Richards' equation for certain auxiliary conditions. These diiculties arise because of discontinuities in the derivative of speciic moisture capacity and relative permeability as a function of capil...

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2003
M. Sanchez W. W. M. Allison G. J. Alner D. S. Ayres W. L. Barrett P. M. Border J. H. Cobb D. J. A. Cockerill H. Courant D. M. Demuth T. H. Fields H. R. Gallagher M. C. Goodman T. Joffe-Minor T. Kafka S. M. S. Kasahara P. J. Litchfield W. A. Mann M. L. Marshak R. H. Milburn W. H. Miller L. Mualem J. K. Nelson A. Napier W. P. Oliver G. F. Pearce E. A. Peterson D. A. Petyt K. Ruddick J. Schneps A. Sousa B. Speakman J. L. Thron

M. Sanchez, W. W. M. Allison, G. J. Alner, D. S. Ayres, W. L. Barrett, P. M. Border, J. H. Cobb, D. J. A. Cockerill, H. Courant, D. M. Demuth, T. H. Fields, H. R. Gallagher, M. C. Goodman, T. Joffe-Minor, T. Kafka, S. M. S. Kasahara, P. J. Litchfield, W. A. Mann, M. L. Marshak, R. H. Milburn, W. H. Miller, L. Mualem, J. K. Nelson, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Pet...

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2012
N. Fajraoui

Drainage experiments are commonly conducted to determine soil hydraulic parameters. Experiments generally measure the temporal evolution of the cumulative outflow as well as pressure heads and water contents at several levels in the column. Then the analysts try to calibrate the model by fitting the model response to the data series. The aim of the present work is to investigate the quality of ...

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Journal: :Water Resources Research 2020

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Journal: :Water Resources Research 1979

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