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首页> 外文期刊>Journal of Hydraulic Engineering >SIMULATION OF GROUND-WATER FLOW IN STEEP BASIN WITH SHALLOW SURFACE SOIL
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SIMULATION OF GROUND-WATER FLOW IN STEEP BASIN WITH SHALLOW SURFACE SOIL

机译：浅表土对盆内地下水流的模拟

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A coupled ground-water/channel flow distributed model has been developed for continuous simulation in a l23-km~2 basin. The aim was to analyze the stream flow generation processes in natural vegetated environments. Finite-difference schemes have been used to solve conservation equations of the 2D saturated subsurface flow and the lD kinematic surface flow. Because of the high hydraulic conductivity of the surface soil, only the saturation excess mechanism of runoff production has been considered. Parameter sensitivity analysis showed the overriding influence of soil storage capacity and conductivity. A grid discretization >l00 m produces a hydraulic conductivity greater than physically meaningful, which considerably increases as the space-grid step increases. Results indicate that the model can satisfactorily simulate the water-flow behavior of the catchment after fitting the three parameters of surface hydraulic conductivity, effective porosity, and evapotranspiration losses. These are done after calculating the conductivity as a function of the height of the water table. The simulation efficiency has varied from 87/100 in the first 5-year calibration period to 85.8/100 in the subsequent 5-year validation period.
机译：建立了地下水/河道水流耦合模型，用于在12km〜2的盆地中进行连续模拟。目的是分析自然植被环境中的水流产生过程。有限差分方案已被用于求解二维饱和地下流和二维运动面流的守恒方程。由于表层土壤的高导水率，仅考虑了径流产生的饱和过量机理。参数敏感性分析显示了土壤存储能力和电导率的主要影响。大于100 m的网格离散化产生的水力传导率大于物理意义，这随着空间网格步长的增加而大大增加。结果表明，该模型在拟合了表面导水率，有效孔隙度和蒸散量三个参数后，可以令人满意地模拟集水区的水流行为。这些是在计算电导率与地下水位高度的函数之后完成的。模拟效率从最初的5年校准期的87/100到随后的5年验证期的85.8 / 100不等。

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