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根据室内外试验观测数据和模拟结果,对比分析了基于混合数值解法求解的一维畦灌地表水流运动模型以及基于二阶时间离散精度有限差分法-四阶空间离散精度有限体积法解算的一维土壤水动力学模型的模拟效果,检验了现有迭代耦合模式改善后的模拟性能。结果表明,利用混合数值解法求解一维畦灌地表水流运动模型具有比Roe有限体积法更好的数值计算稳定性和收敛性;与一阶时间离散精度有限差分法-二阶空间离散精度有限差分法及一阶时间离散精度有限差分法-二阶空间离散精度有限体积法相比,采用二阶时间离散精度有限差分法-四阶空间离散精度有限体积法解算一维土壤水动力学模型具备较好的模拟精度、质量平衡性和收敛速率。与此同时,改善后的迭代耦合模式呈现出较好的模拟精度和质量守恒性,且计算效率平均提高0.7倍以上。基于数值解法和迭代耦合模式同步改进后构建的一维畦灌地表水流-土壤水动力学耦合模型,具有提高模拟精度和计算效率的良好能力。
According to the indoor and outdoor experimental observation data and simulation results, the one-dimensional surface water flow model based on hybrid numerical solution and the second-order discrete-time finite-difference time-resolved finite volume method Simulation results of soil hydrodynamic model verify the improved simulation performance of the existing iterative coupling model. The results show that the hybrid numerical solution method for solving one-dimensional surface water flow model has better numerical stability and convergence than the Roe finite volume method. The first-order finite-difference time-discrete accuracy method, the second-order spatial discrete precision finite difference method Compared with the first-order discrete-time finite-difference method - Second-order spatial discrete finite volume method, the second-order discrete-time finite-difference method Simulation accuracy, mass balance and convergence rate. At the same time, the improved iterative coupling model shows better simulation accuracy and mass conservation, and the computational efficiency is improved more than 0.7 times. Based on the numerical solution and the iterative coupling mode, the one-dimensional surface water flow-soil hydrodynamic coupling model, which is improved and synchronized, has the good ability of improving simulation accuracy and calculating efficiency.