黄土区坡地降雨入渗产流中的滞后机制及其模型研究

滞后作用的存在，不但影响降雨过程中的入渗特性，而且影响产流量。该文通过对入渗产流中的滞后机制分析，建立了考虑滞后作用的坡地降雨入渗产流模型。利用黄土高原沟壑区典型小流域坡地天然降雨入渗－产流的实测资料对模型进行了检验，结果表明：在降雨入渗－产流过程中，滞后作用加快入渗速率，减少径流量；滞后模型使土壤含水量、产流过程接近实测值。因此，在降雨入渗产流过程中考虑滞后作用的影响是必要的。

Hystersis Mechanism and Model of Rainfall-Infiltration Runoff on Hillslope in Loess Area

Hystersis influences infiltration characteristics and runoff volume during the process of rainfall infiltration runoff. However, the study on the hystersis mechanism and model in rainfall infiltration runoff is not reported now. In this paper, a model of rainfall infiltration runoff for hillslope, which hystersis was incorporated, was presented by analyzing the hystersis mechanism. The model was proved systematically by using the natural rainfall infiltration runoff data of hillslope at Wangdong gully small watershed , Changwu county in Shaanxi province. The simulated results showed that the model was of high precision, especially when the hystersis was considered, and predicted results were approximated to measured results. It is very necessary to consider the effects of hystersis during the process of rainfall infiltration runoff.