黄世昌,董伟良,赵帅康,等. 杭州湾嘉兴海塘水文要素重现期组合数值分析[J]. 水利水运工程学报,2023(6):57-66.. doi: 10.12170/20220708001
引用本文: 黄世昌,董伟良,赵帅康,等. 杭州湾嘉兴海塘水文要素重现期组合数值分析[J]. 水利水运工程学报,2023(6):57-66.. doi: 10.12170/20220708001
(HUANG Shichang, DONG Weiliang, ZHAO Shuaikang, et al. Numerical analysis on combination of return periods of hydraulic elements for Jiaxing seawall in Hangzhou bay[J]. Hydro-Science and Engineering, 2023(6): 57-66. (in Chinese)). doi: 10.12170/20220708001
Citation: (HUANG Shichang, DONG Weiliang, ZHAO Shuaikang, et al. Numerical analysis on combination of return periods of hydraulic elements for Jiaxing seawall in Hangzhou bay[J]. Hydro-Science and Engineering, 2023(6): 57-66. (in Chinese)). doi: 10.12170/20220708001

杭州湾嘉兴海塘水文要素重现期组合数值分析

Numerical analysis on combination of return periods of hydraulic elements for Jiaxing seawall in Hangzhou bay

  • 摘要: 近年来强台风频数增加,对杭州湾北岸安全造成严重威胁,提升海塘工程的防护能力,开展潮浪重现期组合计算十分必要。通过天文潮-风暴潮-台风浪数值模型,模拟登陆型历史和设计台风产生的潮位和波浪过程,以此构建嘉兴段海塘前沿潮位和波高样本。研究结果表明:历史台风产生逐时潮位和波高组合基本小于10年一遇潮位与同频波高组合,仅出现1次高于10年一遇的高潮位,呈现为“潮高浪低”重现期组合;设计台风时,当海塘处于100~300年一遇潮位时,海塘东、西两段前沿逐时潮位和波高组合会出现“潮浪等同”“潮高浪低”和“潮低浪高”3种重现期组合,中段则为“潮浪等同”和“潮高浪低”两种重现期组合。最高潮位与最大有效波高组合中,出现“潮高浪低”和“潮浪等同”重现期组合。因此,嘉兴海塘防潮标准为100~300年一遇时,防浪标准应不低于防潮标准。

     

    Abstract: In recent years, the increase of strong typhoon frequency has posed a serious threat to the safety of the northern coast of Hangzhou Bay. It is necessary to improve the protection ability of seawalls and investigate the combination of return periods of hydraulic elements. Based on the numerical model of astronomical tide, storm surge and typhoon wave, we simulated the tide level and wave process generated by historical typhoons landing along the real route and assumed typhoons landing along the assumed route, and constructed a sample of tide level and wave height in front of Jiaxing seawall of the north coast of Hangzhou Bay. The results show that the majority of combinations of tide levels and corresponding wave heights caused by the historical typhoon are less than the combination of tide levels once-in-10-year and wave heights of the same frequency. There is only one above the once-in-10-year among the highest storm tidal levels during the landing of historical typhoons. The combination of return periods shows a combination of “high tide and low wave” return period. During the landing of the designed typhoon on the predicted path, according to the combination of hourly tide level and its corresponding wave height, when the tide level of Jiaxing seawall in Hangzhou Bay is once in 100 to 300 years, it will appear to have three kinds of phenomena about combination of returns: “equal tide and wave”, “low tide and high wave” and “high tide and low wave”. There will be two phenomena of “equal tide and wave” and “high tide and low wave” in the middle section of the seawall. In the combination of the highest tide level and maximum significant wave height in the typhoon process in front of the seawall, when the tide level return period is once in 100 to 300 years, only the phenomena of “high tide and low wave” and “equal tide and wave” appear. Therefore, the tidal level design standard for seawalls is once in 100 to 300 years, and the wave design standard should not be lower than the tide-proof standard.

     

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