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| Determination of wetland water-blocking cofferdams based on hydrodynamic simulation： A case study of Baiyangdian wetland |
| Received:June 11, 2021 |
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| KeyWord:hydrodynamic simulation;cofferdam;streamline;Baiyangdian Lake |
| Author Name | Affiliation | E-mail | | BAI Jie | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | CHEN Jiaqi | 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 | | | MA Xiaomei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | WANG Huanhuan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | ZHAO Yanwei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | awei1974@bnu.edu.cn |
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| Abstract: |
| Owing to the requirements of aquaculture and other social and economic activities, many cofferdams have been built in wetlands, which hinder the connection of the water system and affect the hydrodynamics and self-purification of wetlands. In order to facilitate the restoration of the wetland, it is necessary to determine and remove cofferdams. This study introduces the determination method of key water-blocking cofferdams in wetlands, which includes the following four steps:(1) the distribution diagram of streamlines is extracted using the simulation results of a hydrodynamic model; (2) the indexes of distribution density, distribution uniformity, and mean meandering of streamlines are calculated;(3) the key cofferdams are preliminarily determined; and(4) the key cofferdams are determined according to the topography and land use results. Taking the Baiyangdian wetland as an example, we used this method to determine the key water-blocking cofferdams and to simulate the hydrodynamic changes after their demolition. The results showed that there were eight key water-blocking cofferdams with a total area of approximately 9.93 km2. After their demolition, the streamlines were abundant and more evenly distributed. The proportion of water surface area increased from 90.42% to 94.70%, whereas the proportion of stagnant water area decreased by approximately 4.20%. |
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