供水强度对非充分供水入渗模型参数的影响

基于两种质地不同土壤的非充分供水入渗试验,分析了kostiakov三参数模型描述非充分供水入渗过程的可行性和供水强度R0对入渗模型参数的影响.结果表明:用kostiakov三参数模型描述土壤入渗能力控制阶段入渗过程是可行的;积水时刻tp随供水强度R0的变化呈负幂函数关系,入渗模型系数K等于供水强度与稳定入渗率之差,入渗指数α随供水强度的变化呈幂函数关系,供水强度对稳定入渗率f0影响不大.该研究结果对非充分供水入渗过程的预测有重要意义.

Influence of Water Supply Intensity on Infiltration Model Parameter under Non-sufficient Water Supply

On the basis of the non-sufficient water supply infiltration tests of two homogeneous soils, the feasibility of kostiakov three parameter model and the effect of water supply intensity (R_0) on infiltration model parameter under non-sufficient water supply were analyzed and discussed in this paper. The result shows that kostiakov three parameter model is feasible on soil infiltration capacity control stage, a relation of negative power exponent exists between R_0 and infiltration ponding time, the difference between R_0 and steady infiltration rate is infiltration model parameter K, a relation of power exponent exists between R_0 and infiltration model parameter a, and the effect of water supply intensity on steady infiltration rate is not obvious. The research is of an important significance for forecasting the infiltration process under non-sufficient water supply.