人民长江2024，Vol.55Issue(6)：98-105,8.DOI:10.16232/j.cnki.1001-4179.2024.06.014
极端干旱下长江口咸潮入侵成因及压咸补淡措施
Causes analysis of saltwater intrusion in Yangtze River Estuary during extreme drought and countermeasures
摘要
Abstract
In 2022,the upper reaches of the Yangtze River suffered extreme drought,and the saltwater intrusion in the Yangtze River Estuary(YRE)was intensified,leading to a severe test on regional water security.To investigate the causes and counter-measures of saltwater intrusion under extreme drought,this paper analyzed salinity,tide level,wind speed and direction data during low water periods between 2019 and 2023,as well as runoff data from upstream Datong Station during the same period.Spearman correlation analysis and Chi-square analysis were employed to examine the process of saltwater intrusion in September 2022 and identify key influencing factors.The analysis results revealed that:① Due to extreme drought,the dry conditions of the main stream of the Yangtze River advanced to August 2022.Combined with typhoons and astronomical spring tides,the salinity of Chongmingzhoutou Station,Yanglin Station and Liuyao station in the YRE greatly exceeded the limit from September 2022 to April 2023,reaching 1.922‰,0.585‰ and 2.134‰.②The three salinity monitoring stations located in the YRE experienced varying degrees of saltwater intrusion based on their respective upstream incoming water conditions.When the discharge at Datong Station fell below 15 000 m3/s,different regions along the estuary would be affected by saltwater intrusion accordingly.③ In October 2022,recharging fresh water for repelling saltwater intrusion were implemented during neap tide periods within the YRE.These measures resulted in an increase of discharge at Datong Station to over 12 000 m3/s after water replenishment and effectively com-pressed saline levels in the upper part of the southern branch.These findings provide theoretical support for analyzing factors con-tributing to saltwater intrusion across various areas within the YRE,and developing strategies for managing recharging fresh water for repelling saltwater intrusion.关键词
咸潮入侵/盐度/径流量/潮差/压咸补淡/长江口Key words
saltwater intrusion/salinity/streamflow/tidal range/recharging fresh water for repelling saltwater intrusion/Yan-gtze River Estuary分类
海洋学引用本文复制引用
陈致远,吴敬文,乔红杰,陈鹤翔,金光球..极端干旱下长江口咸潮入侵成因及压咸补淡措施[J].人民长江,2024,55(6):98-105,8.基金项目
国家自然科学基金项目(U2040205) （U2040205）
国家重点研发计划项目(2022YFC3202602) （2022YFC3202602）
