南淝河城市河道水质模型的空间敏感性分析

Spatial Sensitivity Analysis of Urban River Water Quality Model for Nanfeihe River

为认识南淝河的水质特性,在MATLAB/Simulink环境下构建南淝河水质模型,通过敏感性分析,对城市河道的水质过程特征进行深入探究。以污水处理厂为分界点,用Morris敏感性分析方法对总共41个参数,进行上下游的敏感性分析。由结果可知,由于污水处理厂大量尾水的排入,南淝河水质系统从上游以浮游植物生长死亡为主导过程的偏自然系统,转换为下游以反硝化、硝化作用和SOD耗氧等过程为主导的受人类影响严重的系统。该结论为认识河道水质特性和选择恰当的水质修复方法提供理论依据,也为水质模型敏感性分析提供了新的分析思路,同时证明了敏感性分析方法是研究河流系统特征的有效方法之一。

In order to explore water quality characteristics of Nanfeihe River,water quality model was rebuilt in MATLAB/Simulink environment and water quality processes of urban river were investigated through sensitivity analysis.Taking the wastewater treatment plant(WWTP)as a demarcation point,this study took account of41parameters for spatial sensitivity analysis.The results indicated that the upstream of the WWTP which was dominated by the growth and death of phytoplankton,was a natural system.While it was transferred into a human-impacted system in the downstream of the WWTP due to large amount of effluent discharged from the WWTP.The result provided theory basis for understanding water quality characteristics and choosing proper river rehabilitation methods.In addition,the research method of this paper was proved to be an effective tool to study the system features of rivers.