三峡工程蓄水以来九江-湖口河段河道冲淤分析

Analysis of scouring and silting in Jiujiang-Hukou reach Since the impoundment of the Three Gorges Project

三峡工程于2003年6月进入围堰发电期。汛期按135.0m运行,枯季按139.0m水位运行;2006年汛后实施二期蓄水。为动态了解三峡水库蓄水后坝下游河道的冲淤变化情况,同时为更好地满足三峡水库科学调度的需要,本文系统的分析了宏观环境的改变及河道地形的冲淤:三峡工程蓄水前后大通水文站及九江水文站水、沙变化情况,并依据2016年10月九江至湖口河段固定断面观测资料,和2017年河道地形观测资料,分析2017年度九江至湖口河段河床冲淤变化情况。结果表明:三峡工程蓄水以来,上游来水量略减、来沙量锐减,该段河道近期略有微淤,但总体处于冲刷态势,主要冲淤发生在河槽部位。

the Three Gorges project entered the cofferdam power generation period in June 2003.The flood season runs according to 135 m and runs according to the 139 m water level in dry season.The two phase of impoundment is implemented after flood season in 2006.In order to dynamically understand the scouring and silting changes of the lower reaches of the dam after impoundment of the Three Gorges Reservoir and to better meet the needs of scientific operation of the Three Gorges Reservoir,this paper systematically analyzes the changes of macro-environment and the scouring and silting of the river topography:the water and sediment changes of Datong Hydrological Station and Jiujiang Hydrological Station before and after impoundment of the Three Gorges Project,and according to Based on the observation data of fixed section of Jiujiang-Hukou reach in October 16,and the observation data of river course topography in 2017,the erosion and deposition changes of Jiujiang-Hukou reach in 2017 were analyzed.The results show that since the impoundment of the Three Gorges Project,the upstream inflow has decreased slightly and the sediment inflow has decreased sharply.The river course in this section has slightly silted in the near future,but it is generally in a state of scouring and silting,mainly in the channel position.