基于跨界断面水质达标的嘉善污染总量控制

Total amount control of pollutants in Jiashan region based on water quality standard at border-crossing section

为保证地处苏浙沪交界中心的嘉善县水环境质量健康,在考虑嘉善县地理位置特殊性的基础上,提出了以重要跨界断面作为水质达标控制因子的总量控制方法。基于嘉善断面勘测与水质、水文同步监测数据等基础资料构建了嘉善小流域一维水环境数学模型,确定了嘉善区域的水动力和水质模型参数,并选取嘉善地区4个重要跨界断面作为控制断面,利用已率定验证合理的一维水环境数学模型分别对不同削减方案下的水环境进行了水质模拟。模拟结果表明,为满足以跨界断面水质达标为控制因子的总量控制要求,嘉善区域CODMn需削减14.2%,NH3-N需削减37.7%。

In order to ensure the water environment quality to be healthy in Jiashan, the center of border-crossing section of Jiangsu, Zhejiang and Shanghai, the total amount control method using important border-crossing sections as the water quality control factors is promoted, considering the particularity of the location of Jiashan. A one- dimensional mathematical model of water environment in Jiashan region was established based on the data including survey in Jiashan section and hydrology and water quality monitoring data. Hydrodynamic and water quality model parameters in Jiashan region are determined. 4 border-crossing sections in Jiashan region are selected as the control sections. Water quality simulations are conducted under different cutting schemes for the water environment, using one-dimensional mathematical model of water environment, which is calibrated and proved to be reasonable. The results of the simulation indicate that ： the total amount of ammonia nitrogen needs to be reduced by 14. 2% and the total amount of COD needs to be reduced by 37.7% in Jiashan region, to guarantee the water quality in the important border-crossing sections reaching the standard.