基于负荷历时曲线法的长江经济带洈水水库纳污能力研究

Study on the Pollution Load Capacity of the Weishui Reservoir in the Yangtze River Economic Belt Based on the Duration Curve Method

本文依据沙溪坪水文站2010—2020年水文与水质数据,应用负荷历时曲线法(LDC)计算洈水水库对TP、NH3-N和CODMn的纳污能力,并分析了纳污能力的变化特征。结果表明,洈水水库纳污能力季节变化明显,纳污量为夏季>秋季>春季>冬季;根据超标率的计算,TP为主要超标污染物,2010—2020年超标年份占比为73%,超标月份占比为91%;NH3-N与CODMn剩余负荷均为正数无须削减;TP没有剩余负荷,需要严格控制,在高流量期、丰水期、平水期、枯水期和低流量期TP的削减量分别为77.93kg/d、22.51kg/d、9.53kg/d、1.59kg/d、1.36kg/d。研究结果可为洈水水库流域水环境治理提供参考。

Based on the hydrological and water quality data from Shaxiping Hydrological Station for the period 2010—2020,this paper employs the Load Duration Curve(LDC)method to calculate the pollution load capacity of the Weishui Reservoir for TP,NH_(3)-N,and COD_(Mn).It also analyzes the variations in pollution load capacity.The results indicate that the pollution load capacity of the Weishui Reservoir exhibits significant seasonal variations,with pollution load being highest in summer,followed by autumn,spring,and winter.TP is identified as the primary pollutant exceeding the standards,accounting for 73% of the years and 91% of the months during the period 2010-2020.Both NH_(3)-N and COD_(Mn) have positive remaining loads and do not require reduction.However,TP has no remaining load and requires strict control.The reduction amounts for TP during high flow periods,flood periods,normal flow periods,low flow periods,and very low flow periods are 77.93kg/d,22.51kg/d,9.53kg/d,1.59kg/d,and 1.36kg/d,respectively.This research can provide valuable insights for water environmental management in the Weishui Reservoir watershed.