鄱阳湖作为通江湖泊,其洪水大小由多因素共同决定,湖区洪灾频繁。鄱阳湖水利枢纽工程建设后将对洪期复杂水动力过程造成影响。为评估其影响,建立了包括鄱阳湖湖区和尾闾以及长江九江到八里江段在内的平面二维水动力模型,对1954年大洪水和1991年倒灌2种灾害型洪期过程进行情景模拟,分析了枢纽对长江和湖区可能造成的影响。结果表明:枢纽工程使湖口出流过程更加平缓,具有一定的削峰作用,对长江洪水位基本无影响;1954年大洪水过程,枢纽使湖区水位升高,代表水文站水位壅高最大值为0.021 m;1991年倒灌过程,枢纽使湖区水位降低,湖区水位变化的趋势与湖口流量变化趋势一致,相位稍滞后于流量过程。研究成果可为江湖水安全管理提供技术支撑。
Abstract
Poyang Lake, which connects to the Yangtze River, has historically suffered from frequent flooding, with the flood process being influenced by various factors. The construction of the Poyang Lake Project (PLP) will bring about alterations to the complex hydrodynamic processes in flood periods. This study aims to examine the impacts of PLP using a two-dimensional hydrodynamic model. The severe flood in 1954 and the backward flow in 1991 were selected as scenarios to simulate the potential impacts with and without the PLP. The findings indicate that the PLP will moderate the discharge process at Hukou and reduce the peak flood value, while leaving the water level in the Yangtze River unchanged. In the scenario of the severe flood in 1954, PLP raises the water level in Poyang Lake, resulting in a maximum water level increase of 0.021 m at representative hydrological stations. Conversely, in the scenatio of backward flow in 1991, PLP reduces the water level in the lake region. The fluctuation pattern of water level aligns with the discharge process at Hukou, while the phase of water level slightly lags behind the flow process. The research outcomes offer technical support for ensuring the safety of both the Yangtze River and Poyang Lake.
关键词
水动力过程 /
鄱阳湖 /
水利枢纽 /
洪期 /
MIKE21 FM 模型 /
数值模拟
Key words
hydro-dynamic process /
Poyang Lake /
Water Conservancy Hub Project /
flood period /
MIKE21 FM model /
numerical simulation
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基金
国家自然科学基金项目(11972265);中国水利水电科学研究院水利部泥沙科学与北方河流治理重点实验室开放研究基金项目(IWHR-SEDI-2022-04);中央级公益性科研院所基本科研业务费项目(CKSF2021530/HL)
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