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Published on: September 26, 2017
Water quality assessment in a megacity river: Water chemical analysis integrated with AHP-Entropy weighted fuzzy
Jie Ren1, Guilin Han1, Xi Gao1
1State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences (Beijing), Beijing 100083, China; Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China; Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences (Beijing), Beijing 100083, China.
Abstract:
Megacity rivers face growing pollution pressures from multiple anthropogenic sources, posing challenges to traditional water quality assessment methods. This study investigated the water chemistry of the Yongding River (YDR) and its controlling factors. A fuzzy comprehensive evaluation (FCE) model, integrated with Analytic Hierarchy Process (AHP) and Entropy weighting, was applied to assess water quality. The results classified water quality into five grades, with 82 % of samples falling within Grades I to III, indicating generally good conditions. Reservoir discharge significantly improved water quality in the Beijing urban section, while agricultural and domestic wastewater caused deterioration in Huailai and Tianjin. Compared with conventional irrigation assessment indices, the improved FCE model more effectively captures overall pollution status, and offers a robust framework for water quality evaluation in urban rivers impacted by complex natural and anthropogenic factors. The findings support sustainable management and ecological restoration of the YDR and demonstrate the broader applicability of the FCE model to other megacity rivers.
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