
Research on Reservoir Operation Based on the Ecological Flow Process Level
Guo-yu GU, Guo-hua FANG, Xian-feng HUANG, Min YAN, Ling-hui DAI
Research on Reservoir Operation Based on the Ecological Flow Process Level
Based on the ME-Tennant method, this paper defines the ecological flow process level, and constructs an ecological operation model with the highest ecological flow process level and maximum power generation as the operation goal. The improved NSGA-Ⅱ algorithm is used to solve this model, which is used to repair the dewatering reaches of the downstream ecological degradation of the dam. The model is applied to the Kuaizilou-Shuikou Cascade Hydropower Station in Hunan Province, and the results show that the ecological flow and the power generation flow are in a competitive relationship. As the level of the ecological flow process increases, the power generation will also decrease. The power output of the selected reservoir scheduling schemes for the wet year, the normal year, and the dry year are 114.87, 84.44, and 61.39 million kWh respectively, the ecological flow process levels are all at the “very good” level, ensuring the power generation and meeting the high-level ecological water demand for the restoration of ecologically degraded rivers to a healthy state. The research results can provide reference for the ecological operation of reservoirs with ecological degradation problems.
dehydrated river reaches / ME-Tennant method / ecological flow process level / ecological operation {{custom_keyword}} /
Tab.1 Ecological flow process level interval表1 生态流量过程等级区间 |
生态流量过程等级 | 差 | 一般 | 较好 | 好 | 很好 | 最佳 | 最大 |
---|---|---|---|---|---|---|---|
区间 | 0 | (2,3] | (3,4] | (4,5] | (5,6] | (6,7] | 5 |
Tab.2 Evaluation criteria of river ecological flow process表2 河流生态流量过程评价标准 |
等级 | 生态流量占多年平均流量的百分比/% | ||
---|---|---|---|
枯水期(11-次年1月) | 平水期(2-5月,8-10月) | 丰水期(6-7月) | |
最大 | [100,200] | [100,200] | [100,200] |
最佳 | [60,100) | [70,100) | [80,100) |
很好 | [40,60) | [50,70) | [60,80) |
好 | [30,40) | [40,50) | [50,60) |
较好 | [20,30) | [30,40) | [40,50) |
一般 | [10,20) | [20,30) | [30,40) |
差 | [0,10) | [0,20) | [0,30) |
Tab.3 The weight of each month's ecological flow index表3 各月生态流量指标权重 |
| | | | | | | | | | | |
---|---|---|---|---|---|---|---|---|---|---|---|
0.123 | 0.114 | 0.081 | 0.078 | 0.052 | 0.049 | 0.051 | 0.056 | 0.076 | 0.086 | 0.115 | 0.119 |
Tab.4 Typical year operation schemes表4 典型年调度方案集 |
编号 | 丰水年 | 平水年 | 枯水年 | |||
---|---|---|---|---|---|---|
梯级年发电量/万kWh | 生态流量过程等级 | 梯级年发电量/万kWh | 生态流量过程等级 | 梯级年发电量/万kWh | 生态流量过程等级 | |
1 | 12 516 | 2.557 | 9 684 | 2.571 | 7 395 | 2.527 |
2 | 12 416 | 2.587 | 9 581 | 2.613 | 7 306 | 2.575 |
3 | 12 345 | 2.620 | 9 474 | 2.656 | 7 194 | 2.621 |
4 | 12 195 | 2.647 | 9 289 | 3.506 | 7 097 | 3.520 |
5 | 12 096 | 3.498 | 9 188 | 3.529 | 6 838 | 3.560 |
6 | 11 980 | 3.552 | 8 893 | 4.444 | 6 710 | 3.581 |
7 | 11 875 | 4.467 | 8 779 | 4.478 | 6 582 | 4.481 |
8 | 11 775 | 4.502 | 8 651 | 4.501 | 6 475 | 4.507 |
9 | 11 651 | 4.528 | 8 545 | 4.518 | 6 309 | 4.545 |
10 | 11 566 | 5.473 | 8 444 | 5.443 | 6 139 | 5.464 |
11 | 11 487 | 5.492 | 8 316 | 5.463 | 6 030 | 5.479 |
12 | 11 404 | 5.503 | 8 208 | 5.481 | 5 918 | 5.491 |
13 | 11 309 | 5.516 | 8 044 | 5.496 | 5 787 | 5.510 |
14 | 11 236 | 5.525 | 7 909 | 5.506 | 5 681 | 5.521 |
15 | 11 124 | 5.542 | 7 773 | 5.525 | 5 558 | 5.530 |
16 | 11 036 | 5.559 | 7 666 | 5.546 | 5 464 | 5.546 |
17 | 10 954 | 5.573 | 7 550 | 5.560 | 5 359 | 5.556 |
18 | 10 853 | 5.593 | 7 373 | 5.575 | 5 250 | 5.564 |
19 | 10 752 | 5.611 | 7 244 | 5.584 | 5 144 | 5.571 |
20 | 10 647 | 5.623 | 7 054 | 5.598 | 5 022 | 5.586 |
Tab.5 Index weight value表5 指标权重值 |
典型年 | 梯级年发电量 | 生态流量过程等级 |
---|---|---|
丰水年 | 0.530 | 0.470 |
平水年 | 0.512 | 0.488 |
枯水年 | 0.463 | 0.537 |
Tab.6 Typical year ideal operation scheme index set表6 典型年理想方案指标集 |
典型年 | 梯级年发电量/万kWh | 生态流量过程等级 |
---|---|---|
丰水年 | 12 516 | 5.623 |
平水年 | 9 684 | 5.598 |
枯水年 | 7 395 | 5.586 |
Tab.7 Ecological flow process level before and after the construction of the database in the typical year表7 典型年建库前后生态流量过程等级 |
典型年 | 未建库天然河道 | 最优调度方案 |
---|---|---|
丰水年 | 6.496 | 5.492 |
平水年 | 5.365 | 5.443 |
枯水年 | 4.427 | 5.464 |
Tab.8 Comparison of operating status and optimal scheduling plan in the typical year表8 典型年运行现状与最优调度方案对比 (万kWh) |
典型年发电量 | 运行现状 | 最优调度方案 |
---|---|---|
丰水年 | 10 886 | 11 487 |
平水年 | 7 614 | 8 444 |
枯水年 | 6 518 | 6 139 |
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