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Research on the Dagangshan Reservoir Operation in Flood Seasons Based on the Cascade Joint Operation in Dadu River
Yan-jun ZHU, Zai-ni CHEN, Yu-ni XU, Wen-jing NIU
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Research on the Dagangshan Reservoir Operation in Flood Seasons Based on the Cascade Joint Operation in Dadu River
In order to improve the flood control capacity of cascade reservoirs in the Dadu River Basin， Dagangshan Reservoir is considered as the main study object to analyze the problems of the current reservoir operation mode. After setting up different inflow scenarios， and analyzing the flood control capacity of cascade reservoirs， the hydrometeorological forecast accuracy of Dagangshan Reservoir， and the safe discharge of the downstream channel， the cascade flood routing algorithm and the improved pre-discharge capacity constraint method are respectively used to study the flood control operation index of Dagangshan Reservoir under the condition of cascade joint operation and the dynamic operation index under the condition of small inflow， based on which the Dagangshan reservoir operation scheme in the flood season can be formulated. According to the flood routing calculation based on the typical flood process， the flood-peak discharge can be reduced by 530 m³/s when the inflow of Dagangshan Reservoir is large， which can reduce the flood control pressure of downstream section； when the inflow is small， the economic benefit of the Dagangshan Reservoir can increase by 6~9 million kWh based on the premise of ensuring its own safety， which improves the utilization of flood resources. In addition， due to scientific nature and rationality， the research method can provide reliable reference for the operation and management of reservoirs with similar regulation capacity.
Dagangshan Reservoir / flood control / real-time operation / dynamic operation {{custom_keyword}} /
Tab.1 Flood routing results of Dagangshan reservoir表1 大岗山水库最高调洪水位计算成果表 (m) |
| 水库 | 设计洪水位 | 校核洪水位 | 原起调水位 | 最高调洪水位 | |
|---|---|---|---|---|---|
| 1 000 年一遇 | 5 000 年一遇 | ||||
| 大岗山 | 1 125.70 | 1 132.73 | 1 123.00 | 1 125.70 | 1 130.00 |
Tab.2 The highest water level of Dagangshan reservoir under different inflow scenarios when the discharge is controlled at 4 480 m3/s表2 上游不同来水情势下按4 480 m³/s控泄大岗山水库最高上浮水位 |
| 上游来水流量/（m³·s-1） | 来水平稳 | 来水上涨 | ||||||
|---|---|---|---|---|---|---|---|---|
| 6 h | 12 h | 6 h可预泄量/亿m³ | 相应库水位/m | 6 h | 12 h | 6 h可预泄量/亿m³ | 相应库水位/m | |
| 2 000 | 2 000 | 2 000 | 0.540 | 1 127.63 | 3 250 | 4 480 | 0.405 | 1 126.50 |
| 2 500 | 2 500 | 2 500 | 0.432 | 1 126.72 | 3 500 | 4 480 | 0.324 | 1 125.82 |
| 3 000 | 3 000 | 3 000 | 0.324 | 1 125.82 | 3 750 | 4 480 | 0.243 | 1 125.11 |
| 3 500 | 3 500 | 3 500 | 0.216 | 1 124.88 | 4 000 | 4 480 | 0.162 | 1 124.41 |
| 4 000 | 4 000 | 4 000 | 0.108 | 1 123.94 | 4 250 | 4 480 | 0.081 | 1 123.70 |
| 4 480 | 4 480 | 4 480 | 0 | 1 123.00 | 4 480 | 4 480 | 0 | 1 123.00 |
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Fig.1 Topological structure of cascade reservoirs in Dadu River Basin
Tab.1 Flood routing results of Dagangshan reservoirFig.2 Calculation flow chart of the dynamic operation index of the Dagangshan reservoirTab.2 The highest water level of Dagangshan reservoir under different inflow scenarios when the discharge is controlled at 4 480 m3/sFig.3 Operation of cascade reservoirs in Dadu River Basin according to the inflow process of “2020.6”Fig.4 Operations of Dagangshan reservoir under the inflow scenarios of “1992.6”、“2018.7”、“2020.6”
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