湍黏系数对浅滩海域三维风暴潮的影响  

Effects of turbulent viscosity coefficient on 3-D storm surge within shallow seas

作　　者：熊伟[1,2] 朱志夏[1,2] 董佳[1,2] 齐庆辉[1,2] 

机构地区：[1]江苏省交通规划设计院股份有限公司,江苏南京210014 [2]江苏省水运工程技术研究中心,江苏南京210014

出　　处：《水利水运工程学报》2014年第6期45-51,共7页Hydro-Science and Engineering

基　　金：国家高新技术研究发展计划(863计划)资助项目(2012AA112509)

摘　　要：利用WRF大气模式和基于有限体积法的三维海洋数值模型FVCOM,建立了连云港及其附近浅滩海域的三维风暴潮流数学模型。运用k-ε和MY-2.5两种不同的湍流模型,对"韦帕"台风作用下的三维风暴潮流进行了数值模拟,并对计算得到的三维风暴潮流流场结果和垂向湍流黏性系数结果进行了对比分析。计算分析结果表明,两种不同湍流模型计算所得的风暴潮增水差别很小,可以忽略;但在风生流较强的时间段内,MY-2.5湍流模型计算所得的水平流速流向沿垂向分布并不一致,而k-ε湍流模型的计算结果较好,与实测分层潮流资料更为符合。研究结果表明,垂向湍流黏性系数沿水深的垂向分布对浅滩海域风暴潮流水平流速的垂向结构至关重要,建议选用k-ε湍流模型计算垂向湍流黏性系数和湍流扩散系数。Using a WRF atmospheric model and a 3-D ocean numerical model FVCOM based on finite volume method,a three-dimensional numerical model of storm surge within Lianyungang shallow waters is developed. The3-D storm surge during typhoon WIPHA is simulated by use of different turbulence models such as k-ε and MY-2. 5. The simulation results of the 3-D storm surge flow and vertical turbulence viscosity coefficient are analyzed in the study. The analysis results show that,compared with the poor results from MY-2. 5 model,the vertical velocity and direction distribution of the storm surge calculated by k-ε model has a good agreement with the measured data,and the values of the vertical turbulence viscosity coefficient are crucial for the vertical structure of the storm surge,therefore a right turbulence model is preferred. The k-ε turbulence model is suggested for simulation of the 3-D storm surge in the future.

关 键 词：湍黏系数 浅滩海域 三维数值模型 风暴潮 垂向分布 

分 类 号：P731.23[天文地球—海洋科学]