基于TITech-WARM的官厅水库三维水质模拟

3D numerical simulation of water quality in Beijing Guanting Reservoir by a TITech-WARM model

采用TITech-WARM模型构建了官厅水库三维水动力及水质模型.通过实测数据对模型进行验证后发现,水位与垂向温度模拟结果较好,水质模拟的结果均在合理范围内.为了改善官厅水库水质,分别从入库污染负荷,出水口位置与调水改变水位等作了情景假设,探讨了其对水质的影响.结果表明:库区污染物质量浓度减少程度与永定河入库污染负荷去除率为线性关系.此外,调出水降低1m水位,中部出水均会减少原库区污染物质量浓度,同时还减少和缩短了原水体相对稳定度的程度和持续时间.本研究模拟结果可以为官厅水库永定河库区水质改善和管理提供依据.

A three-dimensional hydrodynamic/water quality model for Guanting Reservoir was constructed with TITech-WARM.Hydrodynamic simulation and vertical temperature simulation were found to be good. Water quality simulation was also reasonable.To improve water quality in Guanting Reservoir,measures need to be made to control pollution source load,outlet and water level.Reduction in pollutants in the reservoir area was found to be linear with removal rate of pollution load in Yongding River.Reducing water level by 1mand changing to central water outlet will reduce the concentration of pollutants in the original reservoir area.In addition,extent and duration of relative water column stability is reduced and shortened.This study will help to understand water quality improvement and to manage Guanting Reservoir.