Analysis Of Pollution Characteristics And Pollution Sources Of Rainfall Runoff From Different Underlying Surfaces In A Typical Campus In Hangzhou

In this paper,four different rainfall runoff underlying surface of East Lake Campus of Zhejiang Agriculture and Forestry University for the study of heavy metal contaminants and conventional pollutants in runoff sampling and testing.Determine the runoff water quality characteristics of different underlying surfaces by calculating the EMC value of runoff pollutants,studying the change law of runoff pollutants concentration,analyzing the initial scour effect,and exploring the correlation between rainfall characteristics and pollutant concentrations,and between pollutants and pollutants;the Nemero method based on the entropy weight method is used to evaluate water quality,and the water quality pollution degree of different underlying surface runoff is divided,and By calculating the pollution load of each pollutant in the runoff of the study area,the runoff pollution in the study area is clarified;the method based on principal component analysis is used to distinguish the source of runoff water quality pollution in the study area,and the potential pollution sources of runoff water quality are identified.The results show that the runoff pollutants on each underlying surface both have first flush effect,and the concentration of runoff pollutants is relatively high at the initial stage,and there is a certain correlation between rainfall characteristics and pollutant concentration,and between pollutants and pollutants;different underlying surfaces Rainfall runoff water quality category: roof runoff water quality is grade IV,tile pavement water quality is grade V,asphalt pavement and green land runoff water quality is inferior to grade V,water quality roof> tile pavement> green space> asphalt pavement,runoff water quality in the study area The overall situation is poor;the runoff pollution load in this study area is significantly higher than other areas except TP and Cd,at least twice the pollution load of other areas,and at most 30 times,the pollution is heavy;principal component analysis shows that the study area There are two types of potential pollution sources of runoff water quality;the first is the application of green phosphate fertilizer,the wear of motor vehicle brakes,nearby wire and cable factories and other heavy metal industrial activities;the second is the wear of motor vehicle tires,fuel use,atmospheric dry and wet deposition and the application of compound fertilizer.