北江飞来峡水利枢纽上下游河道演变与原因分析

River evolution and analysis of the upstream and downstream of the Feilaixia Hydraulic Project in the Beijiang River

根据北江飞来峡水利枢纽上下游2001年、2011年和2020年实测河道地形资料,从河道深泓线、河床高程、宽深比及卫星影像图等方面着手,定量分析北江飞来峡水利枢纽上下游近二十年河道演变规律。结果表明:近20年来河道岸线及河势基本稳定;上游河床以轻微淤积为主,下游以冲刷为主;影响河道演变的因素主要包括采砂、水利枢纽建设、航道整治工程等。

According to the measured river course topographic data of the upstream and downstream of the Feilaixia Hydraulic Project in 2001,2011 and 2020,the evolution law of the upstream and downstream of the Feilaixia Hydraulic Project in the recent 20 years is quantitatively analyzed from the aspects of river thalweg,river bed elevation,width depth ratio and satellite image map,etc.The results show that the river shoreline and the river regime is stable in the past 20 years;the riverbed in the upstream of the hydroproject is mainly subject to slight siltation,while the downstream is subject to scouring;the factors affecting the river course evolution mainly include sand mining,water conservancy project construction,waterway regulation project,etc.