南通市河网格局特征及水环境响应

Drainage pattern characteristics and the effects on water environment

对南通市河网景观格局与地表水污染的关系进行探讨。在对南通市的河网景观格局进行定性分析的基础上,设计并定量计算了南通市河网景观格局指标,据此分析了不同排污功能河流的景观格局特点:①就污染程度来说,工业排污河流最为严重,生活排污河流次之,农业排污河流水质最好;②就河流污染物分布来说,工业排污河流最不均匀,生活排污河流次之,农业排污河流最为均匀。这与实测分析结果基本一致,说明城市河网景观格局是影响污染物分布、运移的主要因素之一。

The relationship between drainage pattern and surface water pollution in Nantong City was studied to provide a reference for urban landscape planning. Based on qualitative analysis of drainage landscape patterns, indices were quantitatively identified. The characteristic landscape patterns of rivers with different discharge functions were analyzed. It is concluded that： （1） the pollution in rivers receiving industrial wastewater is most severe, followed by that of rivers receiving domestic sewage, and the pollution in rivers receiving agricultural wastewater is the least severe; （2） the agricultural wastewater-receiving rivers are the most uniform in terms of the distribution of pollutants, followed by rivers receiving domestic sewage, and, finally, by rivers receiving industrial wastewater. The consistency of the results with analyses of monitoring data indicates that the urban drainage landscape pattern is one of the main factors influencing distribution and transportation of pollutants.