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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1016/j.jhydrol.2021.126797
|2 doi
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|a pubmed24n1117.xml
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|a (NLM)34987269
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a He, Junhao
|e verfasserin
|4 aut
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| 245 |
1 |
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|a A two-layer numerical model of soil moisture dynamics
|b Model development
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|c 2021
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 02.11.2022
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Simulating water moisture flow in variably saturated soils with a relatively shallow water table is challenging due to the high nonlinear behavior of Richards' equation (RE). A two-layer approximation of RE was derived in this paper, which describes vertically-averaged soil moisture content and flow dynamics in the root zone and the unsaturated soil below. To this end, the partial differential equation (PDE) describing RE was converted into two-coupled ordinary differential equations (ODEs) describing dynamic vertically-averaged soil moisture variations in the two soil zones subject to a deep or shallow water table in addition to variable soil moisture flux and pressure conditions at the surface. The coupled ODEs were solved numerically using the iterative Huen's method for a variety of flux and pressure-controlled top and bottom boundary conditions (BCs). The numerical model was evaluated for three typical soil textures with free-drainage and mixed flux-pressure head at the bottom boundary under various atmospheric conditions. The results of soil water contents and fluxes were validated using HYDRUS-1D as a benchmark. Simulated values showed that the new model is numerically stable and generally accurate in simulating vertically-averaged soil moisture in the two layers under various flux and prescribed pressure BCs. A hypothetical simulation scenario involving desaturation of initially saturated soil profile caused by exponentially declining water table demonstrated the robustness of the numerical model in tracking vertically-averaged moisture contents in the roots layer and the lower vadose soil as the water table continued to fall. The two-layer model can be used by researchers to simulate variably saturated soils in wetlands and by water resources planners for efficient coupling of land-surface systems to groundwater and management of conjunctive use of surface and groundwater
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|a Journal Article
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|a Evapotranspiration
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| 650 |
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4 |
|a Model
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| 650 |
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|a Richards equation
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| 650 |
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4 |
|a Root zone
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| 650 |
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4 |
|a Soil moisture
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| 650 |
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4 |
|a Vadose soil
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| 700 |
1 |
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|a Hantush, Mohamed M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kalin, Latif
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Rezaeianzadeh, Mehdi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Isik, Sabahattin
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Journal of hydrology
|d 1998
|g 602(2021) vom: 30. Nov., Seite 1-12
|w (DE-627)NLM098183508
|x 0022-1694
|7 nnns
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| 773 |
1 |
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|g volume:602
|g year:2021
|g day:30
|g month:11
|g pages:1-12
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| 856 |
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|u http://dx.doi.org/10.1016/j.jhydrol.2021.126797
|3 Volltext
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|h 1-12
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