人民珠江2024，Vol.45Issue(2)：53-59,7.DOI:10.3969/j.issn.1001-9235.2024.02.007
长江中游荆江水沙过程变异与三口洪道通流能力响应分析
Water and Sediment Process Variation in Jingjiang River in the Middle Reaches of the Yangtze River and Response Analysis of Flow Capacity of Three Outlets
摘要
Abstract
The Jingjiang reach of the middle reaches of the Yangtze River is connected to Dongting Lake through three outlets,forming an extremely complex and far-reaching relationship between the rivers and lakes.The operation of the Three Gorges Project has changed the natural water and sediment process in the Jingjiang River downstream of the dam.This leads to"flattening"flood processes in the main stream,extended middle water period,and an increase in low flow,which has promoted the continuous response of the three outlets to the above water and sediment conditions.Meanwhile,this paper employs a series of long-term measured hydrological consolidation data and river channel terrain observation results from nearly 70 years.Based on this,the response characteristics of the three outlets to the water and sediment variation process of the Jingjiang River are analyzed,and the flow and sediment diversion,river regime,and erosion and sedimentation evolution laws in the entrance area are summarized.The results show that in the same inflow conditions before and after the operation of the Three Gorges Project,the diversion ratio of three outlets decreases,and the sediment diversion corresponds to the sediment from the upstream branch city.Additionally,the sediment diversion ratio continues its gradually increasing trend.After the impoundment and operation of the Three Gorges Reservoir,the riverbed of three outlets is generally in a state of erosion,with a total erosion amount of 51.47 million m3 from 2003 to 2011 and 99 million m3 from 2011 to 2016.The entrance areas have been expanded,but the actual flow capacity has not been significantly improved.关键词
三口洪道/河道演变/通流能力/荆江Key words
three outlets/channel evolution/flow capacity/Jingjiang River分类
建筑与水利引用本文复制引用
沈健,原松..长江中游荆江水沙过程变异与三口洪道通流能力响应分析[J].人民珠江,2024,45(2):53-59,7.基金项目
国家重点研发计划资助(2022YFC3201801) （2022YFC3201801）
