长江口深水航道工程对北槽盐度分布的影响  

Effect of the deep waterway project on the salinities in the north passage of the Changjiang Estuary

作　　者：范中亚[1] 葛建忠[1] 丁平兴[1] 潘灵芝[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《华东师范大学学报（自然科学版）》2012年第4期181-189,共9页Journal of East China Normal University(Natural Science)

基　　金：中荷战略科学联盟计划(2008DFB90240)

摘　　要：基于改进的三维数值模式FVCOM,聚焦于北槽盐度在工程一、二、三期建设过程中的变化情况.考虑径流、潮汐和风场的共同作用,数值模拟和定量分析在各工程阶段特征时刻和半月潮周期平均盐度分布特征.分析计算结果表明:一期工程后,等盐线显著下移.二期工程后,等盐线继续下移;1‰～5‰低盐水控制范围增大;中下段垂向混合变弱,部分时刻盐淡水混合类型从部分混合类型变成高度分层型.三期工程后,1‰～5‰低盐水控制范围继续增大;下段高盐水上溯,相比工程前有少许增加.Unstructured-grid Finite Volume Coastal and Ocean Model （FVCOM） has been applied on the north passage, Changjiang Estuary, to study the salinity distribution and its variations under the impacts of different phases of the deep waterway project （DWP）. Driven by the same forcings of freshwater discharge, tide and wind, the spring-neap-averaged and typical tidal moment＇s salinity distributions under different phases of DWP are simulated and analyzed The modeling results show that the isohaline has been significantly pushed downstream after Phase Ⅰ, and continued moving eastward after Phase Ⅱ. At the same time, the controlling region of isohaline 1‰-5‰ has smoothly increased and the vertical mixing effects seem be weakened from the middle to eastern parts of shipping channel. Strong stratification is revealed along the deep channel. After the Phase Ⅲ, the controlling region of isohaline 1‰-5‰ still increases with the upstream direction. The onshore saltwater intrusion has significantly intensified as the increased baroclinie gradient force due to deepened eastern channel.

关 键 词：长江河口 北槽 深水航道工程 盐度分布 

分 类 号：P731.2[天文地球—海洋科学]