长江口强盐水入侵后期盐度分布规律分析  

Observation And Analysis of Saltwater Intrusion in the Changjiang Estuary

作　　者：吴宇帆 朱建荣[2] 顾靖华[2] Wu Yufan;Zhu Jianrong;Gu Jinghua(Shanghai Investigation,Design ＆ Research Institute Co.,Ltd.Shanghai 200434;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062})

机构地区：[1]上海勘测设计研究院有限公司,上海200434 [2]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《上海水务》2018年第3期1-5,共5页Shanghai Water

基　　金：国家自然科学基金项目(41676083);"上海崇明生态研究院"和上海教委高峰学科"岛屿大气与生态"项目资助

摘　　要：2014年2月长江河口发生强盐水入侵事件,本文利用该盐水入侵后期的观测资料分析了盐度的空间分布和时间变化。结果表明,严重盐水入侵事件后期南支中下段、整个北港、南港盐度均严重超过饮用水标准,且出现垂向分层现象,只有南支上段出现淡水。盐度沿横向断面的分布,除了南支中段断面因前期北港严重正面入侵导致盐水通过新桥通道上溯而表现为盐度值南高北低外,其它所有断面都在涨潮流科氏力右偏的作用下表现为北侧盐度大于南侧。在南槽横断面,强烈的盐水楔产生向陆的斜压压强梯度力,出现表层落潮、底层涨潮的现象。The severe saltwater intrusion occurred in the Changjiang Estuary in February 2014. The author analyzed the spatial distribution and temporal variation of salinity in this paper., North Passage and South Passage in the case that the river discharge approaches monthly mean value. The result shows there existed severe salinity exceeds to the drinking water salinity standard and salinity stratification at the middle and lower reaches of the South Branch, the whole North and South Channel except at the upper reaches of the South Branch during the observation period because there was a severe saltwater intrusion event before the observation. The salinity was higher on the north side than on the south side along the transections due to the right avertence effect of Coriolis force on the flood current, except along the transection at the middle reaches of the South Branch,where the salinity on the south side was higher than on the north side due to the saltwater upstream intrusion through the Xinqiao waterway caused by the severe saltwater intrusion happened in the North Channel in early days. There appeared ebb current at surface layer and flood current at bottom layer along the transection in the South Passage due to the landward baroclinic pressure gradient force induced by the strong saltwater wedge.

关 键 词：长江河口 现场观测 盐水入侵 持续偏北大风 盐度层结 

分 类 号：TV148.4[水利工程—水力学及河流动力学]