Study on erosion and deposition in the main stream and the confluence in the Ningxia reach of the Yellow River
Sediment discharge and cross-section methods are used to study the rive rsedimentation in the main stream and at the confluence respectively in the Ningxia reach of the Yellow River.Variations of erosion and deposition are studied in four different stages,before Liujiaxia and Qingtongxia reservoirs operations (1951-1968),after Liujiaxia and Qingtongxia reservoirs operations (1969-1985),Longyangxia and Liujiaxia reservoirs combination operation (1986-2005) and recent years (2006-2011).Variation of observed cross-sections at river confluence of main stream and tributary stream from 1993 to 2015 are studied based on observation data.Effects of runoff and sediment discharge on erosion and deposition in the main stream are analyzed.Results show that deposition in the main stream was more serious with the increase of annual incoming sediment coefficient,but the increase of sediment from the tributaries exerts little impact on erosion and deposition of riverbed in the main stream;There is no obvious correlation between annual erosion and deposition amounts of all sections in the confluence and annual income sediment coefficient of the main stream;The greater the annual income sediment coefficient from the tributaries,the more serious the river confluence scour is.
Ningxia reach of Yellow Rivermain streamconfluence of main stream and tributary streamerosion and depositionrunoff and sediment discharge
国家科技期刊平台
NSTL
万方数据
维普
