水利学报2018，Vol.49Issue(3)：282-290,9.DOI:10.13243/j.cnki.slxb.20171082
黄土丘陵沟壑区第五副区产沙机制初步分析
The sediment producing mechanism of the No.5 sub-region of the Loess Hilly Region in the Loess Plateau
摘要
Abstract
The No.5 Sub-region of the Loess Hilly Region located mainly in the Northwest Loess Plateau is one of the major sediment source areas in the Yellow River Basin.Based on the results of field surveys and the observed data of underlying surface and rainfall and hydrology,this paper analyzed its sediment source,sediment yielding characteristics and influence factors,and the sediment yielding mechanism were revealed.The results proved that No.5 Sub-region of the Loess Hilly Region is a combination of Loess Hilly Region type and Loess Plateau-gully Region type,and it is characterized with a stretch of loess basin surrounded by groups of loess hills,and possesses loose soil,sparse vegetation,and light rainfall amount and intensity.The sediment sources of this region are not only from the surrounding hilly area,but also from the riverside-bank or the gully-bank of the middle plateau area by a significant amount.The erosion intensity of riverside-bank and gully-bank is most severe in the Loess Plateau,the sediment amount produced from river-or-gully bank in some area even comprises two-thirds of the total sediment yield in the basin,and the intensity would increase with the increase of water joining from mini-ditch to stem-ditch and to river.Floods produced by surrounding hills are main driving force of the bank collapse and slide,and the key influence factors affecting the flood production are vegetation coverage degree and terrace area.The flood yielding ability of the No.5 Sub-region is rather low,but the sediment concentration is high and difficult to reduce notably.关键词
黄土丘陵第五副区/气候下垫面/泥沙来源/产沙/机制Key words
No.5 Sub-region of the Loess Hilly Region/climate/underlying surface/sediment source/sediment producing/mechanism分类
农业科技引用本文复制引用
刘晓燕,董国涛,高云飞,夏润亮,孙一,党素珍..黄土丘陵沟壑区第五副区产沙机制初步分析[J].水利学报,2018,49(3):282-290,9.基金项目
国家重点研发计划项目(2016YFC0402403) （2016YFC0402403）
