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中文摘要：
将基于数值积分的土壤水平衡计算与稳态蒸发通量解析解相耦合,提出一种逼近Richards方程的迭代计算模型,分析不同地下水位下土壤水蓄量变化及其对土壤水蒸发量和潜水蒸发量的影响。采用Hydrus-1D模型对迭代模型进行对比验证,并将模型应用于安徽五道沟实验站地下水埋深分别为0.4 m、0.6 m和1.5 m的3个蒸渗仪的土壤水蓄量变化及蒸发通量的模拟。结果表明,迭代模型具有较高的计算精度,能较好地模拟受地下水位以上毛细管力作用的土壤水蓄量动态过程及蒸发通量,还能反演不同地下水埋深下的土壤渗透系数和孔径分布系数。
英文摘要：
An iterative model was proposed to approximate the Richards＇ equation by coupling the soil water budget method and the analytical solution of steady-state transpiration flux,and was used to analyze the variation of soil water storage with groundwater table and its influences on soil water evaporation and groundwater evaporation. The coupled model was verified against the Hydrus-1D model. Then,the model was applied to simulation of the variation of soil water storage and transpiration flux at the groundwater depths of 0. 4 m,0. 6 m,and 1. 5 m at the Wudaogou Hydrological Experimental Station in Anhui Province,and the results were compared with observations from three lysimeters. The results indicate that the coupled model can effectively simulate the effects of the groundwater table on soil water storage and evaporation flux under capillary forces,and conduct a reasonable inversion of the hydraulic conductivity and pore size distribution index at different groundwater depths.
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