Study of a diagnosis method of watershed water problems based on control units-- Taking Ashihe river basin as an example. Issue 1 (February 2020)

• Record Type: Journal Article
• Authors: Ya, Tao; Liang, Cheng; Zhao, Xiliang; Song, Lingling; Yi, Xu
• Is Part Of: IOP conference series. Volume 450:Issue 1(2020)
• Publication Date: 2020-02
• Subjects: control unit -- diagnosis of water problems -- improved Nemerow comprehensive pollution index method -- Equivalent Load Duration Curve Method; Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/450/1/012117
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: The water quality often showed obvious spatial and temporal changes characteristics of a river system in the basin. However, the conventional water quality diagnosis method which based on the standard of cross-section, easily overlook the spatial-temporal characteristics of pollution load in the basin. Under the concept of ecological environment spatial management and control, the method for diagnosing water environmental problems which had been named the Equivalent pollution Load Duration Curve method was proposed. Combining the hydrological process of the main stream with the water quality concentration of the section, it could been used to effectively identify the main over standard pollutants and their sources in different control units of the river basin. From the results of the application evaluation of a certain basin, it showed that the excessive period was concentrated in the flood season. The main excessive factor was total phosphorus (TP) in the upstream area of the basin, which indicates that for the upstream control unit of the Basin, agricultural and other non-point sources were the main pollution sources. Meanwhile the main over standard pollutant was NH3-N, which was over standard in the whole period in the river estuary area. The pollution reduction control scheme of this control unit should focus on the industrial and living sources.