长江口盐通量估算的数值模拟研究  

Salt flux computation and numerical simulation study in the Yangtze River Estuary

作　　者：范新峰[1] 刘洪生[1] 杨红[1] 

机构地区：[1]上海海洋大学海洋科学学院

出　　处：《上海海洋大学学报》2010年第4期521-528,共8页Journal of Shanghai Ocean University

基　　金：上海市近海海洋综合调查与评价专项(ST1/ST2;PJ1-2;HD3)

摘　　要：基于三维数值模式ECOM,建立了长江口以及近岸海域的水动力耦合盐度数值模式。该模式考虑了移动潮滩边界和深水航道等地形特点。计算结果与实测值比较符合良好,较好地放映了长江口区域盐度场的时空分布特点。模式模拟长江口盐水入侵的三维特征,表层盐度较低而底层盐度较高。利用此模式计算了2003年2月枯季大、小潮时期,在长江口代表性的断面处2个连续潮周期内的盐通量情况。2月1-2日大潮期间北支SEC01、SEC02断面分别为3333600t、957600t,崇头SEC03、SEC04断面分别为-270000t、-71640t,南支SEC05、SEC06断面分别为1364400t、1512000t;2月7-8日小潮期间北支SEC01、SEC02断面分别为205200t、82800t,崇头SEC03、SEC04断面分别为-36360t、-12960t,南支SEC05、SEC06断面分别为309600t、28800t。计算结果显示长江口枯季大、小潮期间盐量变化明显,枯季大潮时期外海向长江口区域输送了巨量的盐分,盐水直接入侵十分明显。此计算结果可为以后在长江口建立相应的挡咸蓄淡工程方案提供重要的科学依据。A three-dimension numerical model to simulate the distribution of salt with a mobile boundary in the Yangtze River estuary is established in this paper. The model is based on an international three-dimension coastal ocean circulation model （ECOM model）.Some complex topography is taken into account,including the deep waterway and the artificially enclosed tideland. The computed results match well with the observed ones,which imply that the model is capable of describing the temporal and spatial distribution of salt current in the Yangtze River estuary. The model imitates the 3D characteristics of saltwater intrusion,salt in the surface layer is lower and salt in the bottom layer is higher. From measurements during two tidal cycles by this model in February 1-2,7-8,2003,the sectional salt fluxes from the North Branch and the South Branch were calculated. The result shows that salt changes obviously during spring-neap tidal cycle. The sea transports a huge amount of salt into Yangtze River estuary during spring tidal cycle. This research provides the necessary data for prediction of saltwater intrusion and aproposed project for avoiding saltwater intrusion in the Yangtze River estuary.

关 键 词：盐通量 长江口 潮周期 三维数值模式 

分 类 号：TV148[水利工程—水力学及河流动力学]