水土保持学报2017，Vol.31Issue(2)：87-91,165,6.DOI:10.13870/j.cnki.stbcxb.2017.02.016
陕北黄土洼聚湫类型划分与侵蚀产沙模拟研究
The Delineate of Natural Dam Type and Erosive Sediment Simulation in Huangtuwa, Northern Shaanxi
摘要
Abstract
In order to reveal the relationship between sediment deposition and precipitation and reconstruct the depositional environment of redeposit loess,the natural dam on the Loess Plateau in northern Shaanxi was chosen as the object of the study.By sampling soil cores at different sites repeatedly and sample measurement,we classified natural dam types and established the erosive sediment model of the standard natural dam in Huangtuwa by means of contrast analysis of 60-year's rainfall data,grain size,and mathematical modeling,etc.The results are as follows:(1) Soil erosion in Huangtuwa could be better reflected when the erosive rainfall standard was set at 9.2 mm.(2) Based on the rainfall data,88.1％ of the annual precipitation in Huangtuwa occurred when the average daily maximum rainfall was less than 52.7 mm,therefore,the area of "non-natural" could be determined using the sediment area resulted from a rainfall less than 52.7 mm.(3) A suitable model for Huangtuwa was established by simulating the capacity curve and setting the elevation point of the vacant capacity at 1 058.03 m,and amending the individual rainfall watershed erosion sediment transport model of Chabagou based on the fractal dimension of Huangtuwa.(4) By contrast analysis of the sediment particle size cycle law of different profiles in combination with data calculated by the model,it could be determined that the "natural dam" was closed to the dam,the "non-natural dam" was between the dam and gully,while the "non-dam" was between the gully bed and the gully head.关键词
黄土洼/聚湫类型/侵蚀性雨量标准/侵蚀产沙模拟/剖面粒度对比Key words
Huangtuwa/natural dam type/erosive rainfall standard/erosive sediment simulation/grain size contrast of profiles分类
天文与地球科学引用本文复制引用
贺燕子,岳大鹏,达兴,程金文,张君茹..陕北黄土洼聚湫类型划分与侵蚀产沙模拟研究[J].水土保持学报,2017,31(2):87-91,165,6.基金项目
国家自然科学基金项目(41071012) （41071012）
陕西省水土流失补偿费资助项目:陕西省能源开发水土保持监测技术研究及信息系统建设 （）
