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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : Study on Control Treatment for Non-point Source Pollution of the Upper-river Basin of Miyun Reservoi...
Study on Control Treatment for Non-point Source Pollution of the Upper-river Basin of Miyun Reservoir Based on Empirical Statistical Models
Author : Jian Jiao and Pengfei Du
Miyun reservoir has become the most important source of drinking water for Beijing. In the past 30 years, with the economic growth and increase of population, the nutrient load of Miyun reservoir increased gradually, which increased the risk for the bloom of harmful algae. This study collected water samples from the river basins at different scales to analyzed the concentration of total - + nitrogen (TN), nitrate (NO -N), ammonium (NH -N), total phosphorus (TP) and index of potassium 3 4 permanganate (COD ) in the water body. And the characteristics of spatial distribution of nutrients were Mn analyzed. Based on establishing the statistical relationship with concentration of nutrients in the water body and the influencing factors, the empirical statistical models were established to adequately address the management for nutrient load reduction in the upper-river basin of the Miyun reservoir. The results - + were as follows. The annual mean concentration of TN, NO -N, NH -N, TP and COD of the rivers in 3 4 Mn - the upper -river basin were 3.86, 2.59, 0.110, 0.027 and 2.03 mg\L. The concentration of TN and NO -N 3 in the Chao River were higher than others. The concentrations of COD in the rivers of the surrounding Mn area of Miyun Reservoir were higher than others. The annual mean concentration of TP (C ) had a TP(a) good linear function with annual concentration of suspended solids(C ): C = 0.025C + 0.024, for S(a) TP(a) S(a) suspended solids are carriers for the transportation of phosphorous. Because of the sands from the croplands, the annual mean concentration of TP also had a good linear function with the ratio of cropland area to the total basin area (R ): C = 0.002R + 0.017. The annual mean concentration of COD C TP(a) C Mn -0.098 (C ) had a good power function with the drainage area(S): C = 4.677S , for organic COD(a) COD(a) compound and reducing substances in the water body were liable to be deposited or evaporated when being transported. Because of more influence of human activities, the annual mean concentration of TN (C ) had a good linear function with the density of people (D) of the basins: C = 0.051D +1.339, TN(a) TN(a) - and the annual concentration of NO -N also had a good linear function with the density of people of the 3 + basins. The differences of the annual mean concentration of NH -N were not obvious between basins, 4 + and much of the NH -N were lost when being transported in the land surface runoff. For sediment 4 particles were carriers for phosphorus transported in rivers, soil conservation may play an important role for phosphorus load reduction. For nitrogen were liable to be transported in water body without carriers, comprehensive control treatment that consist of nutrient, tillage, irrigation, drainage and manure management practices are necessary for reducing nitrogen load. The knowledge gained from this study may provide important suggestion for the ecological plan of the upper-river basin of Miyun reservoir.
File Size : 836,570 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 4 - HYDRO-ENVIRONMENT
Date Published : 18/07/2016
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