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本文提出了垂向下渗的动态集总参数模型,它是以不饱和土壤水流运动偏微分方程的近似空间离散化为依据的。模型的目的是为了描述在雨率变化大的情况下的流域下渗,用一个近似代数方程表示了积水与土壤表面含水量的关系。模型打算用来作为整个降雨径流模型的一个部分,并且能看作为天然流域下渗过程的低维数集合模型。已进行了大量的数值模拟,其结果似乎是非常令人满意的,因为它与用传统的下渗方法得出的结果一致。
This paper proposes a vertical lumped-down dynamic lumped parameter model, which is based on the approximate spatial discretization of unsaturated soil water flow partial differential equations. The purpose of the model is to describe the infiltration of the watershed under conditions of large changes in the rain rate, and to use an approximate algebraic equation to express the relationship between water accumulation and surface water content. The model is intended to be used as a part of the entire rainfall runoff model and can be viewed as a low-dimensional set model for the infiltration process of natural basins. Numerous numerical simulations have been carried out and the results seem to be very satisfactory as it is consistent with the results obtained with the traditional infiltration method.