岷江(内江段)典型区域的非点源污染物入河系数估算及应用

Estimation and Application of Non-point Source Pollutant Inflow Coefficient in Typical Area of Minjiang River(Inner River Section)

为得出流域非点源污染物的入河系数,利用流域河流多年水文水质数据及环境统计数据,基于一维水质模型,建立一种计算流域非点源污染物入河系数的统计方法,并选取岷江(内江段)流域作为研究区域,验证统计方法的可行性和准确性。结果表明:岷江(内江段)流域典型区域的黄龙溪双流龙泉驿区控制单元直排污染源和非点源污染物的氨氮入河系数分别为0.11和0.04,直排污染源和非点源污染物的总磷入河系数分别为0.40和0.08。利用所求污染源入河系数推算污染物入河量的计算值与实际监测值平均误差在±30%左右,表明研究所用方法得出的结果精度较高,对流域污染源入河量估算和排污控制具有一定的参考价值。

In order to obtain the inflow coefficient of non-point source pollutants,a statistical method for calculating the inflow coefficient of non-point source pollutants was established based on one-dimensional water quality model using hydrological and water quality data and environmental statistical data for many years.The Minjiang(inner river section)watershed was selected as the study area to verify the feasibility and accuracy of the statistical method.The results showed that the ammonia nitrogen inflow coefficients of direct discharge and non-point pollution sources were 0.11 and 0.04,respectively,and the total phosphorus inflow coefficients of direct discharge and non-point pollution sources were 0.40 and 0.08,respectively,in the typical area of Minjiang River(inner river section).In this study,the average error between the calculated value and the actual monitoring value was about±30%,which indicated that the accuracy of the results obtained by the research method was high,which had certain reference value for the estimation of the inflow coefficients of pollution sources and pollution control.