波浪作用下近岸区污染物输移扩散的数学模型及其实验验证

在近岸缓坡浅水海岸,波浪破碎产生沿岸流是近岸海域流场的重要组成部分,它对污染物输移扩散规律的影响重大,在高阶近似抛物化缓坡方程求解大面积波浪场基础上,建立了波浪作用下污染物输移扩散数学模型.计算结果与不同坡度均匀斜坡地形上具有不同波高、周期的规则波及不规则波浪作用下污染物输移扩散实验结果进行了比较,分析了各种因素对波浪作用下沿岸流分布规律影响,所得结论认为地形坡度及入射波高对污染物输移扩散的影响较大,波浪作用将使缓坡海滩上污染物的输移扩散平行岸线方向.

Numerical modelling and experimental verification of pollutant transport under waves in the nearshore zone

Wave-induced longshore current is an important flow in the nearshore zone. It is very important to understanding and predicting pollutant dispersion under the wave-induced longshore current especially on mild slope. The model simulating pollutant dispersion under waves is proposed. Wave transformation is simulated based on the higher-order approximate parabolic mild-slope equation. Model tests of different incident waves acting on two plane beaches with different slopes are conducted. The numerical results are compared with the experimental data. The result of analysis indicates that the effect of the slope and the incident wave height on the pollutant dispersion is greater than others based on the comparison between the different cases. Pollutant transport is parallel approximately to the shoreline on the effect of waves for a mild-slope beach.