三维理想河口盐水入侵对径潮驱动变化的响应  

Response of three-dimensional ideal estuarine salt intrusion to changes in river and tidal forcing

作　　者：张钊汇 危小艳 张蔚[1,2] ZHANG Zhaohui;WEI Xiaoyan;ZHANG Wei(Key Laboratory of Ministry of Education for Coastal Disaster and Protection,Hohai University,Nanjing 210098,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;National Oceanography Centre,Liverpool L35DA,United Kingdom)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]河海大学港口海岸与近海工程学院,江苏南京210098 [3]英国海洋研究中心,默西塞德利物浦L35DA

出　　处：《河海大学学报（自然科学版）》2024年第3期96-102,共7页Journal of Hohai University(Natural Sciences)

基　　金：河海大学海岸灾害及防护教育部重点实验室开放基金项目(J202201);英国自然环境研究委员会CHAMFER项目(NE/W004992/1);英国皇家学会中英交流项目(IEC/NSFC/223066);国家自然科学基金长江水科学研究联合基金重点支持项目(U2040203)。

摘　　要：为探究在人类活动与气候条件改变的影响下,径潮动力以及水深的改变对河口区域盐水入侵的影响,建立了三维理想河口盐水入侵数值模型,分析了纵向环流及盐度的垂向与横向沿程分布,研究了垂向与横向剪切作用以及潮泵效应引起的纵向盐输运对盐水入侵的影响以及盐分输运过程对径潮动力与水深变化的响应。结果表明:盐水上溯程度对流量与潮振幅的变化有明显响应,流量增大与潮振幅增大对盐水入侵均有抑制作用;在较浅的河口,潮驱动增大在河口上下游引起相反的潮平均盐度变化趋势,这与横向、纵向剪切与潮泵效应分别引起的纵向盐输运对径潮水深条件的响应相关。In order to explore the response of estuarine salt intrusion to river and tidal forcing as well as water depth under the influence of human activities and climatic changes,a three-dimensional numerical salinity model for three-dimensional ideal estuaries was established.By analyzing the vertical and lateral distributions of longitudinal circulation and salinity,the effects of vertical salt transport induced by the vertical and lateral shear as well as the tidal pumping on saline intrusion,and the response of salt transport to radial tidal dynamics and water depth were studied.The results show that the salt intrusion is sensitive to changes in the river runoff and tidal forcing.In a relatively deep estuary,increasing the runoff or tidal forcing can reduce salt intrusion throughout the estuary.In shallower estuaries,the increase of tidal drive causes the opposite trend of tidal-averaged salinity change in the upstream and downstream of the estuary,which can be explained by the response of longitudinal salt transport to radial tide depth conditions caused by transverse shear,longitudinal shear and tidal pump respectively.

关 键 词：理想河口 盐水入侵 剪切输运 河口环流 数值模型 

分 类 号：P731.23[天文地球—海洋科学]