平原河网地区闸泵群联合调度水环境模拟

为探索闸泵联合调度对水环境的改善作用,以苏州城市中心区为研究对象,基于实测数据构建河网一维水动力-水质数值模型,模拟了45个关键水工调控工程;对污染源做了详细的分类计算,采用实测水质资料对模型进行验证。利用该模型研究了平水年现状调度方案下的水质变化规律,结果表明,CODCr和NH+4-N质量浓度变化与水位呈负相关,且枯水期水质呈现西北好东南差的特点。针对此特点,提出利用城市中心区闸泵群对西塘河引水量进行再分配,作为枯水期水质改善的调度方案,模拟结果表明,在新的调度方案下,大部分区域的水质都能达到更优一级的标准,各站点的污染物浓度都有大幅减少,最多减少了49.7%。

Simulation of water environment under joint operation of gates and pumps in plain river network area

In order to investigate the effects of the joint operation of gates and pumps on the improvement of the water environment, using the central area of Suzhou City as an example, a one-dimensional hydrodynamic and water quality model for river networks, including 45 key hydraulic projects, was established based on measured data. The pollution sources were classified and calculated in detail. The measured water quality data were used to validate the model. The law of water quality change under the conditions of normal years and the current operation scheme was studied. The results show that the variations of concentrations of COD_Cr and NH⁺₄-N are negatively correlated with the water level, and the water quality in dry seasons is better in the northwest and worse in the southeast. Therefore, a scheme for reallocating the diverted water from the Xitang River using gates and pumps in the central area of the city is proposed to improve the water quality in dry seasons. The simulation results show that the water quality in most areas can reach a higher grade under the new operation scheme. The concentrations of pollutants in the monitoring sites decreased significantly, and the maximum reduction rate reached 49. 7%.