风浪扰动下的太湖悬浮物实验与模拟

采用太湖湖区底泥,根据波浪水槽实验总结了各种扰动强度下太湖底泥的起动切应力.波浪水槽可以系统地模拟太湖常见的波浪强度.通过实验确定了太湖底泥的临界切应力为0.050 Pa,采用国外先进的FVCOM模型计算模拟了太湖流场和悬浮物分布并和太湖实测资料进行了对比,结果较为合理,证明了模型的有效性.由于目前太湖的野外监测资料存在较明显的时空不一致性.模型参数率定的精度受到了较大影响,太湖悬浮物与太湖底泥的内源释放以及水体的透明度有较大关系,因此通过室内实验研究太湖的悬浮物规律对太湖的富营养化治理具有重要意义.

Experiment and Model Simulation of Suspended Solids in Taihu Lake Under Wind-Wave Disturbance

The bottom mud in Taihu Lake was simulated indoors in a wave tank. The rules of starting principle of the bottom mud were analyzed under different kinds of disturbing intensity in this paper. The common wave intensity of Tai Lake could be systematically simulated in the wave tank. The critical sheer stress of bottom mud in Tai Lake is 0.050Pa by the experiment. The calculated result of the flow field and suspended solids from the advanced model of FVCOM conforms to the observation data in Taihu Lake very well, which proves validity of the model. Because the conflict of field observation data in time and space greatly influences the accuracy of model parameters, simulating the suspended solids indoors is very important to the cure of Eutrophication in Taihu Lake.