人工岛内湖水体交换数值模拟研究

Numerical simulation study on water exchange between inner lake of artificial island and sea

以海口人工岛工程为例,采用Mike21中的Flow-Model-FM模块建立水动力和保守物质对流-扩散数值模型,模拟节制闸门控制下人工岛内湖水系的流态和水体交换情况。根据设计方案计算结果,结合理论分析,通过调整节制闸门个数、位置以及局部内湖水系边界对设计方案进行优化。优化后方案有效节约了投资成本,减小了闸门附近旋转流,避免了引、排水过程中,水质较差的中湖北侧水系水体流入对水质要求较高的"大圆湖"水系的问题,为内湖景观水系设计和节制水闸设计提供了科学依据。

Taking the Haikou artificial-island project as an example, the hydrodynamics characteristics andwater exchange of inner-lake were numerically simulated by hydrodynamics and transport-diffusion models. The numerical models were built by using Mike21-Flow-Model-FM module. The regulating gates were used to regulate theinner-lake water level. Based on the simulated results of designed scheme and theoretical analysis, the number andposition of regulating gate, the local boundary of inner-lake were optimized. The optimization results in decrease incosts and eddy currents near the 2# regulating gate. For the optimization scheme, less water from northern inner-lake goes into the ＂circular＂ lake located in artificial-island′s south side, during water exchange. The water qualityin the northern inner-lake is not good enough for ＂circular＂ lake. It provides scientific advice to the landscape andregulating gates design.