三峡水库蓄水前后荆江河段冲淤与水沙过程响应  

Response of bed evolution in Jingjiang River to water and sediment process before and after operation of Three Gorges Reservoir

作　　者：樊咏阳 胡春燕 陈莫非 FAN Yongyang;HU Chunyan;CHEN Mofei(Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd,Wuhan 430014,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430014

出　　处：《人民长江》2020年第10期1-6,共6页Yangtze River

基　　金：国家重点研发计划项目“长江河道演变的防洪效应与泥沙调控研究”(2016YFC0402306)。

摘　　要：三峡水库蓄水以来,出库沙量(以宜昌水文站实测数据为依据)大幅度降低,坝下游河床冲淤规律也随之发生改变。实测资料表明:荆江河段发生全面冲刷,而沿程冲刷又进一步引起了下游悬沙输移量的变化。基于1992~2017年长江中下游荆江河段各水文站实测流量、含沙量数据,对该河段水沙关系进行了较为系统的分析,初步得出三峡水库蓄水前、蓄水初期以及试验性蓄水后不同时期的水沙关系变化。基于实测资料,利用输沙量法计算荆江不同河段的冲淤量随流量的变化,提出了不同时期荆江河段冲刷强度最大的流量级。The suspended sediment in the lower reach of Jingjiang River was getting less and less after the operation of Three Gorges Reservoir,resulting in the bed evolution change.The bed evolution of Jingjiang River is both the result and the reason of suspended sediment reduction.Based on the data of measured flow discharge and suspended sediment concentration of hydrological stations from 1992 to 2017 in Jingjiang River,the relationship between flow discharge and suspended sediment concentration was analyzed.The variation of water and suspended sediment relationship before and after the operation of Three Gorges Reservoir was studied.The evolution amount of Jingjiang River was calculated by sediment-transport balance method,and the strongest erosion discharges in different reaches were put forward.

关 键 词：水沙过程 河床冲淤 河流动力学 输沙量法 荆江河段 三峡水库 长江 

分 类 号：TV145[水利工程—水力学及河流动力学]