城市人工湖泊引调水方案优化评估指标体系研究及应用

Application and Study on Optimization Assessment Indicator System for Water Diversion Project of Urban Artificial Lakes

针对龙湖这一具有复杂边界的城市人工湖泊,建立基于无结构网格的二维水流水质耦合计算模式,并进行守恒性验证。提出适用于湖泊引调水方案优化的评估指标体系,包括反映调水流态的流场评价指标和反映水质改善效果的水体置换评价指标。利用该评估指标体系进行龙湖引调水方案的优化研究,对不同进水口位置、进水口水量分配和水下地形的调水方案评价指标进行了计算分析,得到推荐的优化方案,即:3个进水口分别布置在水湾4,水湾6和水湾10;进水口水量依次为4.5 m3/s,8.5 m3/s和3.5 m3/s;水下地形在满足龙湖湖区区域水体功能的前提下尽量采用平底或缓坡地形。

Based on the unstructured meshes, a 2D flow- pollutants coupled numerical model is established to simulate the flow and concentration fields for Loughu lake, an urban artificaial lake with complex irregular＇ boundaries. Conservation is validated to the model. An indicator system is established to assess optimization for water diversion project, including flow fields indicators and water replacement indicators. The assess system is adopted to study optimization for project of water diversion of Longhu lake. Assessment indicators of water diversion schemes with different inlets, flux and topography are calculated and compared. The final optimized scheme shows that： the three inlets are inlet 4, inlet6 and inletl0; the corresponding flux are 4.5 m3/s,8.5 m3/s and 3.5 m3/s;the plain topography is preferential according to region water function in lake.