Analysis of Ecological Water Replenishment Cycle and Flow Field Distribution Characteristics of Datong Lake
In the post-Three Gorges period,the deep evolution of the relationship between the Yangtze River and Dongting Lake breaks the hydraulic pattern that the water flows into Datong Lake from the northwestern corner and discharges from the southeastern corner of Datong Lake.To study the ecological water...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2022-01-01
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| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2022.06.010 |
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| Summary: | In the post-Three Gorges period,the deep evolution of the relationship between the Yangtze River and Dongting Lake breaks the hydraulic pattern that the water flows into Datong Lake from the northwestern corner and discharges from the southeastern corner of Datong Lake.To study the ecological water replenishment cycle and the characteristics of flow field distribution of Datong Lake under variant environment,we build a two-dimensional hydrodynamic model of water systems based on MIKE 21FM and simulate the hydrodynamic conditions for the project of river-lake connection and ecological water replenishment of Datong Lake.Then,the water replenishment cycle and flow field morphological characteristics of Datong Lake are studied under six scenarios,such as different ecological water replenishment flow and different gate control,and the critical point of ecological water replenishment efficiency is presented.The results reveal that the flow rate distribution of the control scheme of “single in-double out” is more uniform than that of the control scheme of “single in-single out.” During the non-irrigation period,when the flow of ecological water replenishment is 20.48 m<sup>3</sup>/s,and the pump flow of the Mingshan Station is 10.5 m<sup>3</sup>/s,the percentage of the lake area with a flow rate of 0.5~5.0 mm/s to the total area is about 79.96%,with a replenishment cycle of 95 d;during the irrigation period,when the flow of ecological water replenishment is 28.92 m<sup>3</sup>/s,and the pump flow of the Mingshan Station is 10.5 m<sup>3</sup>/s,the percentage of the lake area with a flow rate of 0.5~5.0 mm/s is about 87.82%,with a replenishment cycle of 80 d. |
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| ISSN: | 1001-9235 |