Explicit scheme for the numerical solution of unsaturated flow in heterogeneous media under shallow water table conditions.
An explicit 4-cell (4C) numerical scheme is proposed for the integration of the flow equations in the unsaturated zone designed for plain areas with shallow water tables. The scheme contemplates a weighting coefficient to define the representative unsaturated hydraulic conductivity between adjacent...
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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CURIHAM: Centro Universitario Rosario de Investigaciones Hidroambientales Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario Director: Dr. Ing. Hernán Stenta Riobamba 245 bis, 2000 Rosario (Santa Fe), Argentina. Telefa
2021
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| Acceso en línea: | https://cuadernosdelcuriham.unr.edu.ar/index.php/CURIHAM/article/view/169 |
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| Sumario: | An explicit 4-cell (4C) numerical scheme is proposed for the integration of the flow equations in the unsaturated zone designed for plain areas with shallow water tables. The scheme contemplates a weighting coefficient to define the representative unsaturated hydraulic conductivity between adjacent cells and considers the heterogeneity of each edaphic horizon. The 4C scheme is compared with estimates made by HYDRUS-1D in two sets of modeled tests, one with surface saturation for 10 days and the other with rainfall series for 96 days. The numerical tests were performed for 14 types of soil associations characteristic of the study area (A° del Azul, Bs. As.) and 6 phreatic depths (between 300 and 50 cm). For the first trial, the response of the scheme is considered acceptable with percentage differences of about 19%. In the second, the proposed scheme estimated satisfactorily the phreatic recharge with percentage differences of 1% between both schemes. In addition, it showed a very good adjustment in the evolution of moisture contents of each stratum. These results validate the proposed simplified scheme allowing a fast response in terms of computational time. |
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