Author(s): Wang Hua; Yan Huaiyu; Pang Min; Deng Yanqing
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Keywords: No Keywords
Abstract: The river-lake system located to the northwest of Lake Taihu and heavily polluted by human activities, was selected as the research area. Given its inner-and inter-annual variations of water quantity and complicate material transportation, a 1-2D coupled water quality model was established and validated against the field monitoring data to quantify the impacts of the varied artificial pollutant control projects, which have been implemented by the local government during the recent seven years (2010-2016), on regional water quality. The following results stood out: (1) The COD, TN, and TP concentrations at the evaluation sections after the emplacement of the projects were respectively reduced by 9.06%, 12.76%, and 12.24% than before on average; (2) Due to the types, densities, and distributions of the artificial projects, their impacts on water quality markedly varied with space-time conditions. During the flood seasons (May to October), the improvement rates of TN and TP could reach 13.47% and 12.86% for the efficient prevention on agricultural non-point sources. Owing to the stable reduction on municipal point sources, COD was reduced more significantly in the dry seasons from November to April; (3) As more artificial projects were distributed in the upstream, water quality at S2 and S3 in the middle was ameliorated more obviously than other sections, and the average improvement rates could reach 12.23% and 10.48% respectively.
Year: 2018