涪江绵阳段河流水环境容量测算

为了缓解西部大开发对涪江绵阳段造成的河流污染，用标准指数法对涪江绵阳段进行了水质评价．将河流划分为9个水域功能区，针对不同河段的特点建立河流水质模型，采用一维和二维模型计算涪江绵阳段河流水环境容量，以减小计算误差，并按照行政区划分配剩余水环境容量．研究结果表明：涪江绵阳段有机污染严重，部分河段水质严重超标；涪江绵阳段的水环境容量化学需氧量为56142t／a，氨氮为3109t／a．研究结果为绵阳市河流水环境管理决策和总量控制提供了依据．

Water Environment Capacity Calculation of Fujiang River in Mianyang

To decrease the water pollution of the Fujiang river within the administrative district of Mianyang, the standard exponent method was used to appraise the water quality. Nine functional water areas were partitioned, different models based on the characteristics of each area were constructed, and the water environmental capacity (WEC) of the river was calculated respectively using one- and two-dimensional models to decrease the error of calculation. Finally, the residual WEC was distributed in administrative districts. The research results show that the water quality of the Fujiang river has been polluted by organic objects, and its chemical oxygen demand and ammonia-nitrogen are respectively 56 142 and 3 109 t/a. The research provides a reference for water environmental management and control of the Fujiang river.