太湖湖流、波浪、沉积物的三维数值模拟

Three-dimensional numerical simulation of current,waves and sediment transport in Taihu Lake

运用ECOMSED模拟风速为6.5 m/s定常东南风作用下太湖流场及波浪场,对模型的适用性及可靠性进行验证;在此基础上进行波流共同作用下沉积物再悬浮数值模拟,得出沉积物-水界面切应力及水体中悬浮物浓度分布。结果表明：太湖有效波高范围在9-29 cm之间,有效波高的空间分布与风速、风向和水深有很大的关系,同时波浪对切应力会产生很大影响,而切应力的分布决定了悬浮物浓度的分布,风浪及地形要素是导致太湖悬浮物浓度变化的重要因子。模拟结果与现有实验成果较吻合,说明运用该模型模拟太湖沉积物再悬浮的结果可靠。

The Estuary Coastal Ocean Model incorporated with Sediment（ECOMSED） model was used to simulate the flow and wave field under a steady southeast wind of 6.5 m/s in Taihu Lake,and the suitability and reliability of the model was verified.Based on this,numerical simulation of sediment re-suspension was carried out with the joint action of waves and currents,and the distributions of shear stress and suspended matter concentration on the water-sediment interface were obtained.The results show that significant wave height was in the range of 9 to 29 cm,and the spatial distribution of significant wave height had a strong relationship with wind speed,wind direction,and water depth.Meanwhile,waves had a significant impact on shear stress,and the shear stress distribution determined the distribution of suspended matter concentration.Therefore,wind and topography are two important factors leading to changes of the concentration of suspended matter in Taihu Lake.The simulation results agreed with existing experimental results,proving that this model can reliably simulate sediment re-suspension.