传输时间尺度的季节变化规律研究  

Numerical Study on Seasonal Variation of Transport Time Scales

作　　者：杨洁[1] 余锡平[1] 

机构地区：[1]清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《南水北调与水利科技》2010年第3期48-51,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金资助项目(10772099)

摘　　要：传输时间尺度是表征水体中物质运动特性的重要参数。海湾内水体运动受潮汐、河流径流、风等多方面因素的影响。这些影响因子在季节间存在差异,相应地使得水体的传输时间尺度也存在一定的季节性差异。基于三维水动力模型COHERENS,采用拉格朗日粒子追踪的方法对游弋时间和滞留时间这两个传输时间尺度分别进行了模拟,并以日本东京湾为例,分析了传输时间尺度呈现出的季节变化特征差异。研究表明,传输时间尺度在分布特征上的季节差异与河流径流及气象因素等都有着密切的联系,并且河流径流量会影响传输时间尺度的量值。Transport time scales are important parameters in studying mass transport characteristic of a water body system.The seasonal variation of transport time scales exists according to variation of current,which is forced by tide,meteorological forcing and river discharge,etc.The residence time and age,as the generally used transport time scales,are simulated by using the Lagrangian particle tracing algorithm in Tokyo Bay,based on the Three-dimensional COupled Hydrodynamical Ecological model for REgionNal Shelf seas（COHERENS）.And the seasonal variation of the two transport time scales is studied and discussed.The seasonal variation of transport time scales is shown to be in close relationship with the river discharge and meteorological forcing,moreover the river discharge do effect the horizontal distribution of transport time scales and their magnitude in all seasons.

关 键 词：传输时间尺度 季节特征 数值模拟 粒子追踪 东京湾 

分 类 号：TV148[水利工程—水力学及河流动力学]