饱和与非饱和带土壤水动力耦合模拟及入渗试验

Dynamic coupled modeling and infiltration experiment on soil water in saturated and unsaturated zones

利用可变坡土槽人工降水入渗试验,观测土壤水势及地下水出流量变化,建立了饱和与非饱和带土壤水数值计算模型MODFLOW-UZF1的参数率定及模型验证方法.结果表明:MODFLOW-UZF1能较为准确地模拟降水入渗补给过程,但忽略了非饱和带土壤水分运移中基质势的影响,在毛细管作用带土壤含水量模拟效果较差.

Through artificial precipitation infiltration experiments in a soil trough with variable slopes, the variation of soil water potential and groundwater discharge was observed. A method of parametric calibration and model validation for the widely used nmnerical model of soil water in saturated and unsaturated zones, that is, MODFLOW-UZF1, was established. The numerical results show that the MODFLOW-UZF1 can correctly simulate the precipitation infiltration process. However, it ignores the effect of the matric potential in transport of soil water in the unsaturated zone, and it results in a larger error between the simulated and observed soil moisture contents in the capillary zone.