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| Evaluations of water environment carrying capacity: A case study in the Baiyangdian watershed, China |
| Received:February 25, 2020 |
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| KeyWord:water environment carrying capacity;Baiyangdian watershed;analytic hierarchy process;entropy value method;variable fuzzy recognition model |
| Author Name | Affiliation | E-mail | | BAI Jie | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | WANG Huan-huan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | LIU Shi-cun | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | TIAN Kai | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHAO Yan-wei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | awei1974@bnu.edu.cn | | LI Chun-hui | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| Evaluation of water environment carrying capacity can provide an important basis for management of the ecological environment. This study took the Baiyangdian watershed as an example and established an evaluation indicator system and standards for the carrying capacity of water resources, the aquatic, and aquatic ecology. It proposed an indicator weight determination method based on an analytic hierarchy process (AHP)and entropy value method and used these to calculate the carrying capacities of water environment in the last 20 years; the results were evaluated using a variable fuzzy recognition model. The results showed that the comprehensive characteristic values of the water environment carrying capacity in the Baiyangdian watershed increased from 1.84 to 3.16 during the period 1998-2017 and showed an upward trend. The carrying capacity was at a low level from 1998-2012 and at a medium level from 2013-2017. Based on different parameters, the characteristic values of water resources and the aquatic environment increased from 1.18 and 1.92 to 2.72 and 3.36 respectively, with an increasing trend, while the characteristic values of aquatic ecological elements decreased from 3.44 to 2.31 with a decreasing trend. The protection and restoration of water ecology based on controlling water pollution and conserving water resources should be the focus in the future. |
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