海平面上升对珠江口咸潮入侵的影响  

Impact of sea level rise on saltwater intrusion in the Pearl River Estuary

作　　者：黄光玮 匡翠萍[1] 顾杰 黄洪城 HUANG Guang-wei;KUANG Cui-ping;GU Jie;HUANG Hong-cheng(School of Civil Engineering,Tongji University,Shanghai 200240,China;College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 200240,China)

机构地区：[1]同济大学土木工程学院,上海200240 [2]上海海洋大学海洋生态与环境学院,上海200240

出　　处：《水动力学研究与进展（A辑）》2021年第3期370-379,共10页Chinese Journal of Hydrodynamics

基　　金：国家重点基础研究发展计划(2012CB957704);上海教委重点学科建设项目(J50702)。

摘　　要：该文基于MIKE21软件建立珠江口二维水动力-盐度输运数学模型,采用实测潮位、流速和盐度资料对模型进行验证,利用验证好的数学模型模拟海平面上升0.5 m、1 m和2 m三种情况下珠江口枯季盐度分布的变化,探究咸潮入侵对海平面上升的响应特征。结果表明,随着海平面上升,珠江口枯季大潮期间盐度整体呈现上升趋势,但在局部地区盐度变化分布存在一定的差异;涨憩时刻磨刀门、落憩时刻磨刀门和洪奇门的等盐度线较为密集,盐度变化梯度较大。最大盐度变化发生在磨刀门口门附近,海平面上升0.5 m、1 m和2 m,涨憩时刻最大盐度增加分别为1.8 ppt、3.6 ppt和7.2 ppt,落憩时刻最大盐度增加分别为2.2 ppt、4.8 ppt和9.6 ppt,这表明海平面上升愈高,河口盐度增加愈大。A two-dimensional hydrodynamic and salinity transport mathematical model of the Pearl River Estuary(PRE)is established based on MIKE21.The mathematical model,which is verified well by the measured tidal level,velocity and salinity data,is used to simulate the change of salinity distribution in the dry season of PRE when sea level rise(SLR)by 0.5 m,1 m and 2 m,and to explore the response of saltwater intrusion to sea level rise.The numerical results show that the salinity of the PRE during the spring tide in the dry season generally increases with the SLR,but the salinity change distributions in different branches of the estuary are different.The isohalines are relative dense,i.e.,the salinity gradient is larger,in Modaomen at the flood slack and in Modaomen and Hongqimen at the ebb slack.With 0.5 m,1 m and 2 m SLR,the maximum salinity increases in Modaomen are 1.8 ppt,3.6 ppt and 7.2 ppt respectively at the flood slack,and 2.2 ppt,4.8 ppt and 9.6 ppt respectively at the ebb slack,i.e.,the higher of SLR is,the larger of salinity increase is.

关 键 词：海平面上升 咸潮入侵 珠江口 数值模拟 

分 类 号：P76[天文地球—海洋科学]