北部湾及广西近海潮流数值模拟

该文采用二维浅水模型模拟分析了北部湾海域潮流系统,并在此基础上建立了广西沿海一、二维耦合水动力模型,模型中考虑了广西沿岸6条主要入海河流对近岸水动力的影响,进一步分析了广西近海海域潮致余流场及其对近海污染物输移扩散的影响。模型潮位计算值和实测值符合良好。结果显示:K1分潮在北部湾口形成一个逆时针旋转潮波系统,M2分潮在湾顶越南海防附近形成逆时针旋转潮波系统,广西近海海域K1分潮占优。广西沿海海域内,离岸较近的海域余流场相对较强,余流速度受浅水效应及湾口等地形缩窄影响而增强;离岸较远海域余流明显减弱,水体交换能力降低。

Numerical simulation of tides and tidal currents in the Beibu Gulf and Guangxi coastal areas

A two-dimensional numerical model was used to simulate the tides in the Beibu Gulf.A 1-D and 2-D coupled numerical model was then used to simulate the tidal currents to analyze pollutant transport in Guangxi coastal areas,north of the Beibu Gulf.The simulations of the tides and tidal currents are in good agreement with observationss.In the Beibu Gulf,K1 is a counterclockwise rotating system with the amphidromic point located in the baymouth.M2 is also a counterclockwise rotating system with the amphidromic point in the north,close to Hai Phong,Vietnam.In the Guangxi coastal areas,the tide-induced residual currents in the areas near the shore are much stronger than those further away.The shallow water and narrowed baymouth strengthen the residual currents.