水科学进展2016，Vol.27Issue(2)：256-265,10.DOI:10.14042/j.cnki.32.1309.2016.02.011
陕北风沙区含砾石工程堆积体坡面产流产沙试验
Experimental study on runoff and sediment yield from engineering deposition with gravel in the northern windy-sandy region, Shaanxi
摘要
Abstract
Engineering deposition is a special geomorphic unit which exhibits very serious soil and water loss in im-provement and construction projects. Experimental research regarding the soil erosion laws of geomorphic units with different compositions and ratios under different rainfall conditions is an urgent concern. In the present study, indoor artificial rainfall simulation was applied to investigate the processes of runoff generation and sediment yield on the slope of deposition with gravel in the northern windy-sandy region of Shaanxi province, China. The results reveal the following:① The runoff coefficient influenced by infiltration rate, which changed due to the existence of gravel, first increased and then decreased linearly when the gravel content increased with a critical content of 10%, and increased linearly with the increase in rainfall intensity. ②The overland flow velocity on rocky deposition was lower than the ve-locity on homogeneous deposition. Stronger effects of gravel on delaying runoff were found with the increase in rainfall intensity, but the effects of rainfall intensity on velocity were weaker when the gravel content increased. ③ The soil detachment rate increased significantly after 24—33 min in the period of runoff generation. Gravel mainly affected the erosion rate after the significant increase.④The gravel increased the sediment yield under 1. 0 mm/min rainfall inten-sity, while it decreased the total sediment when the rainfall intensity was higher. The results of this study are useful for providing reliable experimental information for the erosion model development of national engineering depositions.关键词
风沙土/工程堆积体/砾石含量/径流系数/产沙量Key words
aeolian sandy soil/engineering deposition/gravel content/runoff coefficient/sediment yield分类
农业科技引用本文复制引用
康宏亮,王文龙,薛智德,郭明明,李建明,白芸,邓利强,李艳富..陕北风沙区含砾石工程堆积体坡面产流产沙试验[J].水科学进展,2016,27(2):256-265,10.基金项目
国家自然科学基金资助项目（40771127）；水利部公益性行业科研专项经费资助项目（201201048） The study is financially supported by the National Natural Science Foundation of China （ No．40771127） and the National Non-Profit Research Program of China （ No．201201048）． （）
