STOCHASTIC ANALYSIS OF WATER FLOW IN HETEROGENEOUS MEDIA |
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Authors: | YANG Jin-zhong WANG Wei-ping CAI Shu-ying LI Shao-long National Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan China |
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Affiliation: | YANG Jin-zhong,WANG Wei-ping,CAI Shu-ying,LI Shao-long National Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China |
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Abstract: | A stochastic model for saturated-unsaturated flow is developed based on the combination of the Karhunen-Loeve expansion of the input random soil properties with a perturbation method. The saturated hydraulic conductivity k_ s (x) is assumed to be log-normal random functions, expressed by f(x). f(x) is decomposed as infinite series in a set of orthogonal normal random variables by the Karhunen-Loeve (KL) expansion and the pressure head is expand as polynomial chaos with the same set of orthogonal random variables. With these expansions, the stochastic saturated-unsaturated flow equation and the corresponding initial and boundary conditions are represented by a series of deterministic partial differential equations which can be solved subsequently by a suitable numerical method. Some examples are given to show the reliability and efficiency of the proposed method. |
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Keywords: | saturated-unsaturated flow Karhunen-Loeve (KL) expansion perturbation method stochastic numerical modeling |
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