水保所知识产出(1956---)知识库

地面灌溉模型能够精确模拟灌溉水流运动过程，有助于评价农田灌溉性能。现有地面灌溉模型主要包括外
耦合模型、迭代耦合模型和完全耦合模型。现有地面灌溉数值模型运用较多的是外耦合模式和迭代耦合模式，基于
完全耦合模式的地面灌溉数值模型研究鲜见。地表水流模型与土壤水流模型耦合过程将引起耦合误差，这是由于地
表水流模型和土壤水流模型计算时会产生误差，并且基于耦合模式的地表水流计算与土壤水流计算转换也易引起部
分误差。

Most surface irrigation models are developed by Saint-Venant equations with Richards equation or
empirical formulas. The coupling methods include external coupling, iterative coupling and full coupling. Most of
the surface irrigation models are developed based on external coupling and iterative coupling methods and the full
coupled models for surface irrigation were rarely reported in the literature. The coupling error is caused by three
reasons. The first is mass balance error from the infiltration overestimation, the second source arises when the
surface model becomes inactive but there is still water on the land surface, and the third source is that the transfer of
modal information from surface grid to the subsurface grid and vice versa.