Water environmental capacity and total water pollution quantity control of Chaping River, Sichuan Province

以流经四川绵阳市安县河流茶坪河为研究对象,在对该河流水污染负荷、水环境现状及水环境功能充分调查的基础上,结合该河流的水文特征和排水规划以及四川省绵阳市环境监测站2005年实测的数据,采用二维浅水水动力学—水质模型方程组对茶坪河的各监测断面CODCr和NH3-N的浓度场进行了计算模拟和对比,并用一维水环境容量计算模型计算了该河流的水环境容量,提出了具体的总量控制措施.结果表明:用二维浅水水动力学—水质模型方程组计算各监测断面的CODCr和NH3-N与实测值相差不大;茶坪河水环境容量CODCr为123.96t/a,NH3-N为42.95t/a,所排放的CODCr量、NH3-N量已经超过该流域容量,出水水质已超过水质保护目标Ⅲ类标准.;The object of research is Chaping River which flows over Anxian County in Mianyang City, Sichuan Province. Based on agreat number of investigations on the load of water pollutants, the situation and function of water environment of the river, theriver-basin hydrological character, the river draining plan, and observation date at environmental monitoring station of MianyangCity Sichuan Province in 2005, two-dimensional hydrodynamic shallow-water model equations were used for monitoring COD and NH3-N concentrations in section of the Chaping River and the simulations were compared. A one-dimensional model was used tocalculate the water volume capacity of the river's water environments and the ways controlling the total quantity were provided.Results indicated that using two-dimensional hydrodynamic shallow-water model equations to calculate the monitoring sectionshowed a small measured difference for COD and NH3-N. For the water environmental capacity of Chaping River, COD was 123.96t/a and NH3-N 42.95 t/a. The COD and NH3-N emission volume would exceed the capacity in the basin, and the quality of outputwater would exceed the III grades of water protecting standards.