基于自动监测的台风“利奇马”降雨对城市地表水水质影响分析

Analysis of the Impact of Typhoon“Lekima”Rainfall on Urban Surface Water Quality Based on Automatic Monitoring

以小清河济南段为受纳水体研究对象,利用水质自动监测数据研究2019年8月台风"利奇马"降雨期间地表水水质的变化规律及影响趋势。研究表明,降雨量与CODMn相关性较差,与NH_(3)-N,TP,TN,DO呈正相关,与电导率呈负相关。8月10日~13日睦里庄断面NH_(3)-N,TN均超出地表水Ⅲ类标准;辛丰庄断面NH_(3)-N,TP,TN均超出地表水Ⅲ类标准。睦里庄断面降雨后1~2 d污染物质量浓度出现激增,NH_(3)-N,TP,TN日均值分别升高4.7,1.4,2.8倍,降雨结束5 d后NH_(3)-N,TP,TN降至前期水平;辛丰庄断面降雨当天NH_(3)-N,TP,TN日均值出现不显著增长;降雨结束1~2 d后NH_(3)-N,TP降至前期水平。降雨引起小清河水质变化的首要污染物为NH_(3)-N。

The Jinan section of the Xiaoqing River was listed as the research object of the receiving water body,and the water quality automatic monitoring datas were used to study the change law and influence trend of surface water quality during the rainfall of typhoon"Lekima"in August 2019.Studies have shown that the correlation between rainfall and CODMnwas poor,which was positively correlated with NH_(3)-N,TP,TN and DO,and negatively correlated with EC.From August10 th to 13 th,NH_(3)-N and TN at Mulizhuang section exceeded the surface water ClassⅢstandard;Xinfengzhuang section NH_(3)-N,TP,TN exceeded ClassⅢstandards.The Mulizhuang section saw a sharp increase in the concentration,1~2 days after the rainfall.The daily average concentrations of NH_(3)-N,TP,and TN increased sharply by 4.7,1.4 and 2.8 times respectively,and 5 days after the rain ended,the concentration of NH_(3)-N,TP,TN decreased to the previous level;the daily average concentrations of NH_(3)-N,TP,and TN did not increase significantly on the day of rainfall in Xinfengzhuang section;the concentration of NH_(3)-N and TP dropped to the previous level after 1~2 days of the rainfall.NH_(3)-N was the primary pollutant caused by rainfall to change the water quality.