长江科学院院报 ›› 2018, Vol. 35 ›› Issue (1): 52-56.DOI: 10.11988/ckyyb.20160940

• 防洪减灾 • 上一篇    下一篇

上游水电站围堰漫顶溃决条件下施工中期度汛水位数值模拟

张超, 蒋陶   

  1. 中国电建集团 成都勘测设计研究院有限公司, 成都 610072
  • 收稿日期:2016-09-12 出版日期:2018-01-01 发布日期:2018-01-11
  • 作者简介:张 超(1985-),男,湖北襄阳人,高级工程师,博士,主要从事施工导截流风险决策研究及工程设计。E-mail:hippop888@163.com
  • 基金资助:
    成都勘测设计研究院有限公司科研资助项目(P228-2014);成都勘测设计院研究有限公司青年科技基金项目(P294-2015)

Numerical Simulation of Flood Level During Mid-stage Construction ofHyropower Station in the Presence of Overtopping Failure ofUpstream Cofferdam

ZHANG Chao, JIANG Tao   

  1. Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China
  • Received:2016-09-12 Online:2018-01-01 Published:2018-01-11

摘要: 比邻梯级水电站同期建设条件下,若上游水电站围堰遭遇超标洪水发生漫顶溃决,将严重威胁下游水电站施工中期度汛的安全,因此,对度汛水位变化过程进行数值模拟具有重要意义。基于水动力学理论方法,建立了上游水电站围堰漫顶溃决条件下中期度汛水位变化过程模拟的数学模型,并将该模型应用于大渡河流域某相邻梯级水电工程实例中。通过不同计算方案的数值模拟分析,结果表明:该模型及方法是可行的、有效的;相比于基于天然洪水流量的计算方法,所提方法更加贴近工程实际,且度汛最高水位明显增大,因而更有利于工程安全。研究成果为上游水电站围堰挡水条件下的施工中期度汛方案决策及防洪应急预案的制定提供了重要的理论依据。

关键词: 梯级水电站, 施工中期度汛水位, 围堰漫顶溃决, 数值模拟, 水动力学理论

Abstract: Simulating the flood level at downstream cascaded hydropower station in mid-stage construction is of critical significance once the adjacent upstream cofferdam in simultaneous construction encounters standard-exceeding flood and overtopping failure which severely threatens the construction safety of the downstream plant. In line with the hydrodynamic theory, a mathematical model is built for simulating the process of water level variation in mid-stage construction period under the condition of cofferdam break of the upstream cofferdam. The model is applied to two adjacent cascade hydropower stations in Dadu River valley. Simulation results suggest that the model is feasible and effective. Compared with the calculation method based on natural flood flow, the proposed method is closer to the actual situation, and the obtained maximum water level in flood season is apparently larger, which is more conducive to the safety of the project. This study provides an important theoretical basis for the decision-making and flood emergency planning of downstream plant in mid-stage construction with cofferdam in the upstream.

Key words: cascaded hydropower station, flood water level in mid-stage construction, overtopping failure of cofferdam, numerical simulation, hydrodynamic theory

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