长江南通段污染带影响因素研究

Study on Affected Factors of Nantong Reach of Yangzi River Pollution Zone

通过建立应用贴体坐标系和有限体积法求解的二维水流—水质方程的模型,对潮汐河口南通段污染带的影响因素进行研究。揭示了水深、水面比降、纵向及横向混合系数以及污染物的排放时段与污染带范围的相关关系,并进行了各影响因素的灵敏度分析,对灵敏度大小进行了排序:水深>水面比降>横向混合系数>纵向混合系数>排放时段。

This article intended to explore the affected fac-tors of Nantong reach of Yangzi River pollution zonethrough establishing a depth averaged two-dimen-sional flow-quality model. It is not only revealed cer-tain relation between the pollution zone and severalaffected factors, such as waterdepth, water slope, lon-gitudinal and lateral mixing coefficients, as well as thedischarging time, but also offered the sensitivity analysisof each factor and their sequence.