An Integrated Numerical Model for Vegetated Surface and Saturated Subsurface Flow Interaction
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摘要: 构建一个综合的数值模型,用来处理植被地表径流与饱和地下水流之间的相互作用问题.综合了早先提出的准三维植被地表径流模型,与二维饱和地下水流模型建立起该数值模型.植被地表水流模型被构建为,二维浅水方程(SWE)显式的有限体积解,耦合了Navier-Stokes方程(NSE)隐式的有限差分解,得到了竖向速度的分布.地下水流模型是以二维饱和地下水流方程(SGE)显式的有限体积解为基础构建.通过在连续方程中引入源-汇项,达到植被地表径流和地下水流之间的相互作用.单一的规则将2个解紧密地耦合在一起.最后,应用4个案例来验证本综合模型,结果是令人满意的.Abstract: The construction of an integrated numerical model was presented to deal with interactions between vegetated surface and saturated subsurface flows. The numerical model was built up by integrating previously developed quasi-three-dimensional vegetated surface flow model with a two-dimensional saturated groundwater flow model. The vegetated surface flow model was constructed by coupling the explicit finite volume solution of the two-dimensional shallow water equations (SWE) with the implicit finite difference solution of Navier-Stokes equations (NSE) for vertical velocity distribution. The subsurface model was based on the explicit finite volume solution of twodimensional saturated groundwater flow equations (SGFE). The ground and vegetated surface water interaction was achieved by the introduction of source-sink terms into the continuity equations. Two solutions were tightly coupled in a single code. The integrated model was applied to four test cases and the results were satisfactory.
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