南方中等城市水环境治理研究——以浙江省义乌市为例

Research on environment improvement scheme of medium-sized cities in southern China——Taking Yiwu City in Zhejiang as an example

建立了义乌市河道水质模型,根据现状污染排放条件,计算结果表明义乌市河道实际已无环境容量。即使在10%保证率最枯月平均流量条件下,义乌市河道也无法达到Ⅲ类水体要求。进一步提出河道水环境治理方案,计算各治理方案下义乌市河道水质变化,为义乌市水环境治理提供科学依据。另外,研究表明针对我国南方,类似义乌境内丰、枯径流悬殊比较大的山溪性河流,采用90%保证率最枯月平均流量作为水环境容量计算的设计水文条件,超越现实状况太多,实现难度很大。

With the river water quality modeling of Yiwu City, there is no water environment capacity in the status quo of pollution discharge. Even with 10% guarantee efficiency of the average discharge in driest month, the river water quality of Yiwu City can not be up to m standard. River water quality is calculated with different improvement schemes put forward in this paper. It provides scientific foundation for water environment improvement in Yiwu City. In addition, as for mountain river in southern China with character of much difference in high- flow runoff and low- flow runoff, it is discussed that it is not realistic for 90% guarantee efficiency of the average discharge in driest month to be regarded as the design discharge for the water environment capacity.