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。 Surface irrigation model can accurately simulate the process of irrigation water flow, contribute to the evaluation of farmland irrigation performance. The existing groundwater irrigation models mainly include out-coupling model, iterative coupling model and complete coupling model. The existing numerical models for surface irrigation use more outcoupling and iterative coupling modes, and the research on the numerical model of surface irrigation based on the complete coupling mode is scarce. Coupling errors between the surface water flow model and the soil water flow model can cause coupling errors due to errors in the calculation of the surface water flow model and the soil water flow model and partial errors in the surface water flow calculation and the soil water flow calculation and conversion based on the coupled modes.