摘要
坡面侵蚀产沙的沿程分布规律研究是认识土壤侵蚀规律、进行有效水土保持的理论基础。为了揭示坡面侵蚀产沙的沿程分布规律以及不同坡长下细沟的发育规律 ,我们进行了不同坡长 (2 5、5、7 5、10m)和不同雨强 (0 72、1 16、1 4、2 0、2 4mm min)的室内模拟降雨实验。结果表明 ,在实验条件下 ,黄土坡面侵蚀产沙从坡顶向下依次增大。但在不同雨强条件下变化趋势有所差异。当雨强小于 2mm min时 ,坡面侵蚀在 5～ 7 5m坡段急剧增加 ;雨强大于 2mm min时 ,发生急剧变化的坡段上移至 2 5～ 5m。上方来水是影响坡面侵蚀产沙的重要原因 ,短坡条件下 ,坡面侵蚀量与上方来水量成直线关系。细沟密度是描述细沟发育程度较好的指标 。
The study of the distribution of soil loss on loess slope is a theoretical base to understand the mechamism of soil loss and control soil loss effectively. In order to study the mechamism of soil loss on different segments and the development of erosion configuration for different slope length, simulated artificial rainfall experiments of different slope length (2.5,5,7.5, 10m) for different rainfall intensity (0.72,1.16,1.4,2.0,2.4mm/min) were conducted. The results showed that under the experimental condition the soil loss increases from the top of the slope to the down stream, but the increment is different for different rainfall intensity. When the rainfall intensity is less than 2mm/min, the soil loss increases rapidly in the 5～7.5m segment. When the rainfall intensity exceeds 2mm/min, the soil loss increases rapidly in the 2.5～5m segment. The run on water is the key factor to affect soil loss on the hillslope.The soil loss increases linearly with run on water under short slope; Rill density is a better parameter to describe the development of rill, and it increases linearly with rainfall intensity.
出处
《泥沙研究》
CSCD
北大核心
2003年第1期33-38,共6页
Journal of Sediment Research
基金
国家自然科学基金项目 (4 0 2 710 72 )
