长山河水质评价及变化趋势分析

Water Quality Evaluation and Change Trend Analysis of Changshan River

以2015~2019年长山河4个水质监测站的监测数据为基础,采用综合水质标识指数法对其历年水质进行评价,利用季节性kendall检验法对各监测断面的高锰酸盐指数,氨氮,总磷等3个监测指标变化趋势进行分析。结果表明:长山河各断面的综合水质均达到或优于水功能区目标要求,水质污染总体呈下降趋势,其中长山河大桥和长山闸一号桥综合水质下降趋势明显。长山河监测断面中高锰酸盐指数浓度变化趋势为上游呈高度显著上升,中下游为高度显著下降。氨氮浓度为上游无显著变化,中下游为高度显著下降。总磷浓度除长山闸一号桥为显著下降外,其余断面均呈高度显著下降。

Based on the monitoring data of 4 water quality monitoring stations in Changshan River from 2015 to 2019,the comprehensive water quality identification index method was used to evaluate the water quality over the years.The seasonal Kendall test method was used to analyze the change trends of CODMn,NH_(3)-N and TP of each monitoring section.The results indicated that:the comprehensive water quality of each section of Changshan River reached or exceeded the target requirements of water function zone.The overall water quality pollution showed a downward trend,among which the comprehensive water quality of Changshan River Bridge and the First Bridge of Changshan Sluice showed a significant downward trend.The concentration of CODMn showed a significant increase trend in the upper reaches of Changshan river,and a significant decrease trend in the middle and lower reaches.There was no significant change in the concentration of NH_(3)-N in the upstream,but in the middle and lower reaches,it decrease significantly.The concentration of TP decreased in the First Bridge of Changshan Sluice,and decreased significantly in the other three monitoring sections.