Li Yi, Shao Ming'an
College of Water Resources and Architecture Engineering, Northwest Sci-Tech University for Agriculture and Forestry, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2006 Dec;17(12):2271-6.
With simulation test, this paper studied the patterns of rainfall infiltration and redistribution in soil on typical Loess slope land, and analyzed the quantitative relations between the infiltration and redistribution and the movement of soil water and mass, with rainfall intensity as the main affecting factor. The results showed that rainfall intensity had significant effects on the rainfall infiltration and water redistribution in soil, and the microcosmic movement of soil water. The larger the rainfall intensity, the deeper the wetting front of rainfall infiltration and redistribution was, and the wetting front of soil water redistribution had a slower increase velocity than that of rainfall infiltration. The power function of the wetting front with time, and also with rainfall intensity, was fitted well. There was also a quantitative relation between the wetting front of rainfall redistribution and the duration of rainfall. The larger the rainfall intensity, the higher the initial and steady infiltration rates were, and the cumulative infiltration increased faster with time. Moreover, the larger the rainfall intensity, the smaller the wetting front difference was at the top and the end of the slope. With the larger rainfall intensity, both the difference of soil water content and its descending trend between soil layers became more obvious during the redistribution process on slope land.
通过模拟试验，研究了典型黄土坡地土壤降雨入渗及再分布规律，以降雨强度为主要影响因素，分析了入渗与再分布过程中土壤水分及质量运移的定量关系。结果表明，降雨强度对土壤降雨入渗、水分再分布及土壤水分微观运移均有显著影响。降雨强度越大，降雨入渗及再分布湿润锋深度越大，土壤水分再分布湿润锋增长速度低于降雨入渗湿润锋增长速度。湿润锋与时间、降雨强度的幂函数拟合良好。降雨再分布湿润锋与降雨历时之间也存在定量关系。降雨强度越大，初始入渗率和稳定入渗率越高，累积入渗随时间增加越快。此外，降雨强度越大，坡面顶部与坡面末端湿润锋差值越小。降雨强度越大，坡地再分布过程中土层间土壤含水量差值及其下降趋势越明显。
