中国科学院机构知识库网格系统: Influences of coupled wind-water processes on suspended sediment grain size: An example from tributaries of the Yellow River

中国科学院机构知识库网格

Chinese Academy of Sciences Institutional Repositories Grid

Influences of coupled wind-water processes on suspended sediment grain size: An example from tributaries of the Yellow River

文献类型：EI期刊论文


作者	Xu Jiongxin
发表日期	2005
关键词	Catchments Flow of fluids Grain size and shape Precipitation (meteorology) Regression analysis Sediments Water Wind
英文摘要	Some unique coupled wind-water erosion processes exist in the desert-loess transitional zone in the middle Yellow River basin. Based on data from 40 stations on 29 rivers, a study was made on the influence of such processes on suspended sediment grain-size characteristics of the tributaries of the Yellow River. Results show that the percentage of >0.05-mm grain size decreases with the increased annual mean precipitation, but increases with the increase in the annual mean number of sand-dust storm days. The percentage of <0.01-mm grain size increases with the increase in the annual mean precipitation, but decreases with the increase in the annual number of sand-dust storm days. Based on annual mean data from 40 stations, multiple regression equations were established between the percentages of >0.05-mm grain size (r>0.05) and <0.01-mm grain size (r<0.01), annual mean precipitation (Pm) and annual mean number of sand-dust storm days (DSS). On this basis, the relative contributions of the variations in DSS and Pm to the variation in r>0.05 and r<0.01 were estimated. The results indicate that the variation in sand-dust storm frequency exerts greater influences on the variation in grain-size characteristics of suspended load than does the variation in annual mean precipitation. With the increase in the coupled wind-water processes index, expressed by Pm/DSS, the percentage of >0.05-mm grain size in suspended sediment decreases and the percentage of <0.01-mm grain size increases. With the variation in Pm/DSS, different combinations of r>0.05 with r<0.01 appear, which have some influence on the formation of hyperconcentrated flows. There exist some optimal ratios of coarse to fine fractions in suspended sediment that make sediment concentrations of hyperconcentrated flows the highest. The optimal r>0.05/r<0.01 value is related to some range of the index Pm/DSS. When the Pm/DSS index falls in this range, the optimum combination of relative coarse with fine sediments in the suspended load appears, and thus results in the peak values of sediment concentration. Copyright © 2005 IAHS Press.
出处	Hydrological Sciences Journal
卷	50 期:5 页:881-895
收录类别	EI
语种	英语
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24477]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu Jiongxin. Influences of coupled wind-water processes on suspended sediment grain size: An example from tributaries of the Yellow River. 2005.

入库方式： OAI收割

来源：地理科学与资源研究所

浏览0

下载0

收藏0

其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。