流域枯水条件下长江口盐水入侵变化特征  

Variation Characteristics of Saltwater Intrusion in the Yangtze Estuary under Dry Water Conditions

作　　者：袁昊 王金华[1] Yuan Hao;Wang Jinhua(Nanjing Hydraulic Research Institute,Nanjing,China)

机构地区：[1]南京水利科学研究院,江苏南京

出　　处：《科学技术创新》2024年第12期54-57,共4页Scientific and Technological Innovation

基　　金：长江口防洪御潮及供水保障对变化条件的响应机制和应对措施(长江水科学研究联合基金U2340225)。

摘　　要：河口地区在枯水季常出现盐水入侵现象,对当地取水用水产生严重影响。本文基于2022年9-11月6个测站的实测盐度、潮位数据及历年大通流量数据分析发现:盐水入侵的发生与径流大小有着密切关系,夏季干旱造成的流域性枯水是造成盐水入侵提前发生的主要因素;长江口盐度大小与径流呈反比,与潮差呈正比;潮汐变化使得盐度具有半月周期变化和日变化特征。Saltwater intrusion often occurs in estuarine areas during the dry season,which has a serious impact on local water intake.Based on the analysis of the measured salinity and tide level data of six stations from September to November in 2022 and Datong station historical flow data,it is found that the occurrence of saltwater intrusion is closely related to the size of runoff,and the flow low water caused by summer drought is the main factor causing the early occurrence of saltwater intrusion.The salinity value was inversely proportional to the runoff and positively proportional to the tidal range.The salinity has the characteristics of semilunar cycle and diurnal variation due to tidal variation.

关 键 词：盐水入侵 大通流量 潮汐 北支倒灌 现场观测 

分 类 号：P731.12[天文地球—海洋科学]