盐度层化对长江口水动力的影响

摘要

基于FVCOM三维水动力及盐度模型，在考虑盐度层化和不考虑盐度层化两种条件下对长江口附近海域进行了水动力盐度数值模拟。计算结果表明，盐度层化产生的紊动抑制对垂向紊动粘滞系数和水平流速有较明显的影响。与不考虑盐度层化的计算结果相比，考虑盐度层化后，垂向紊动粘滞系数变小，流速垂向平均值变大，表层流速变大，底层流速变小，与实测值更为吻合。%Based on the three dimensional FVCOM model, hydrodynamics of the Yangtze River estuary was simulated with and without salinity. The results show that, the turbulence suppression by salinity stratification de⁃creases the vertical eddy viscosity coefficient and affects the velocity obviously. It is also known that the depth⁃aver⁃aged velocity increases, the surface velocity becomes larger, the bottom velocity becomes smaller. The velocity with salinity is in better agreement with the measured data.