Ecological control of non-point source pollution based on small watershed in the water source of the Middle Route of South-to-North Water Diversion Project
WANG Chao 1, , JIA Haiyan 1, LEI Junshan 1, XU Jianfeng 1, LEI Pei 2, YIN Wei 1, , 1.Changjiang Water Resources Protection Institute, Wuhan 430051, China 2.State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210046, China
Abstract:Danjiangkou Reservoir, as the water source of the middle route project, water quality protection is very critical. The basic way to control the non-point source pollution is to build the ecological control system of non-point source pollution in the watershed unit. Based on the current situation of Danjiangkou reservoir area, the general idea of five-in-one ecological control for the non-point source control in the watershed unit: ‘controlling mountains’,’purifying water’, ‘protecting forests’,’protecting farmland’, ‘governing villages’ was put forward. The measures at catchment basin, catchment channel and pond node are connected and functionally complementary to form non-point source pollution control system in small watershed. The implementation of ecological control scheme of non-point source pollution includes background investigation, problem identification of small watershed, measures layout and design, project construction and operation monitoring. The application practice of technological approaches were carried out at Qianjiagou small watershed in Danjiangkou Reservoir, after the construction of the non-point source resistance control system, the total nitrogen and total phosphorus in the small watershed decreased by 33.9% and 49.1% on average. The overall resistance control effect of small watershed was good, which can provide reference for pollution control of non-point source in Danjiangkou Reservoir area. Key words: Middle Route of South-to-North Water Diversion Project/ Danjiangkou Reservoir/ water source/ small watershed/ non-point source pollution/ ecological control.
图1丹江口水库位置图 Figure1.Location of Danjiangkou Reserovir
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图2小流域面源生态阻控总体思路和技术框架 Figure2.General idea and technical framework of ecological control of non-point source in small watershed
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图3小流域面源生态阻控实施流程 Figure3.Implementation process of ecological control for non-point source pollution in small watershed
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图4钱家沟小流域面源污染生态阻控措施布局 Figure4.Layout of ecological control measures for non-point source pollution in Qianjiagou Watershed
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图5钱家沟小流域面源生态阻控典型工程设计 Figure5.Design of typical ecological control measures for non-point source pollution in Qianjiagou Watershed
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表1钱家沟小流域主要生态工程措施面源污染阻控效果 Table1.Non-point source pollution control effect of main measures in Qianjiagou Watershed
Ecological control of non-point source pollution based on small watershed in the water source of the Middle Route of South-to-North Water Diversion Project
WANG Chao 1, , JIA Haiyan 1, LEI Junshan 1, XU Jianfeng 1, LEI Pei 2, YIN Wei 1, ,
Corresponding author: YIN Wei, 2000yinwei@163.com
1.Changjiang Water Resources Protection Institute, Wuhan 430051, China 2.State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210046, China Received Date: 2020-02-14 Accepted Date: 2020-07-06 Available Online: 2020-10-14 Keywords: Middle Route of South-to-North Water Diversion Project/ Danjiangkou Reservoir/ water source/ small watershed/ non-point source pollution/ ecological control Abstract:Danjiangkou Reservoir, as the water source of the middle route project, water quality protection is very critical. The basic way to control the non-point source pollution is to build the ecological control system of non-point source pollution in the watershed unit. Based on the current situation of Danjiangkou reservoir area, the general idea of five-in-one ecological control for the non-point source control in the watershed unit: ‘controlling mountains’,’purifying water’, ‘protecting forests’,’protecting farmland’, ‘governing villages’ was put forward. The measures at catchment basin, catchment channel and pond node are connected and functionally complementary to form non-point source pollution control system in small watershed. The implementation of ecological control scheme of non-point source pollution includes background investigation, problem identification of small watershed, measures layout and design, project construction and operation monitoring. The application practice of technological approaches were carried out at Qianjiagou small watershed in Danjiangkou Reservoir, after the construction of the non-point source resistance control system, the total nitrogen and total phosphorus in the small watershed decreased by 33.9% and 49.1% on average. The overall resistance control effect of small watershed was good, which can provide reference for pollution control of non-point source in Danjiangkou Reservoir area.