Impacts of sea level rise, strong typhoon and storm surge on extreme sea level in coastal waters of Xiamen and hazards estimation
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摘要: 气候变化背景下海平面上升、强台风和风暴潮对我国东南沿海地区的洪涝灾害影响日益严重,为应对气候变化的影响,本文以位于我国东南沿海的厦门地区为例,应用多种海洋大气观测资料和数理统计及模拟方法,分析了历史上9914号和1614号两次台风对厦门海域极端海面高度(极值水位)的影响,预估了未来海平面上升情景下厦门海域极值水位的变化及其危险性。结果表明:(1) 9914号台风期间,天文大潮、风暴增水和强降水的同时出现造成了厦门沿海地区超警戒极值水位(732 cm)的出现;(2) 风(向岸强风)、雨(强降水)、浪(巨浪)、潮(高潮位)、流(急流)等多致灾因子的共同作用是厦门沿海地区发生严重灾情的重要原因;(3) 在温室气体中等和高排放(RCP4.5和RCP8.5)情景下,到2050年(2100年),当前百年一遇的极值水位将分别变为30年(2年)一遇(RCP4.5)和25年(低于1年)一遇(RCP8.5)的频繁极端事件。这表明未来厦门沿海极值水位的危险性将显著上升,应采取充分的适应措施降低洪涝灾害风险。Abstract: Sea level rise, strong typhoon and storm surge have increasingly serious impacts on coastal flood disasters in the southeastern China in the context of climate change. To address the climate change and estimate the hazard of extreme sea level in the future, based on the multiple data of oceanographic and atmospheric observation and methods of mathematical statistics, the impact of historical strong typhoon No.9914 (Dan) and No.1614 (Meranti) on the extreme sea level in coastal waters of Xiamen and estimates the changes and return of extreme sea level at scenarios of future sea level rise under RCP4.5 and RCP8.5 was analyzed in this paper. The results show that: (1) astronomical tide, storm surges and heavy precipitation induced the extreme sea level event (732 cm) during the period of strong typhoon No.9914; (2) the combined impacts of multiple hazards such as wind (ashore gale), rainfall (heavy precipitation), waves (giant waves), tides (high tide) and current (torrents) is an important cause of serious disasters in coastland of Xiamen; (3) under the medium and high greenhouse gas emission scenarios (RCP4.5 and RCP8.5), by 2050 and 2100, recent 1-in-100-year extreme sea level event will become 1-in-30-year (1-in-2-year) and 1-in-25-year (1-in-less than 1-year). It shows that the hazards of extreme sea level on coastland of Xiamen will increase significantly, and high adaptation measures in Xiamen should be taken to reduce the risk on coastal flood hazards in the future.
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Key words:
- sea level rise /
- typhoon /
- storm surge /
- extreme sea level /
- hazards
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表 1 1989−2018年我国沿海各省因风暴潮造成损失情况
Tab. 1 The losses caused by storm surges in each coastal provinces of China from 1989 to 2018
省份 死亡及失踪人数 直接经济损失/亿元 辽宁 3 22.33 河北 2 41.92 天津 9 3.43 山东 170 102.86 江苏 53 103.19 上海 22 39.92 浙江 1942 691.16 福建 1291 983.97 广东 487 990.56 广西 160 94.83 海南 221 371.48 表 2 不同气候(RCP4.5、RCP8.5)情景下厦门验潮站50年一遇和100年一遇的极值水位的变化(相对于1954−1999年)
Tab. 2 1-in-50-year and 1-in-100-year extreme sea level events at Xiamen tidal gauge station, referenced to 1954−1999 for RCP (4.5, 8.5) scenarios
气候情景 时间 重现期/a 对应极值水位高度/cm 当前 50 737 100 751 RCP4.5 2030年 50 750 100 764 2050年 50 762 100 776 2100年 50 798 100 812 RCP8.5 2030年 50 751 100 765 2050年 50 765 100 779 2100年 50 822 100 836 表 3 不同气候(RCP4.5、RCP8.5)情景下厦门验潮站当前50年一遇和100年一遇极值水位的重现期的变化(相对于1954−1999年)
Tab. 3 The return period of recent 1-in- 50-year and 1-in-100-year extreme sea level events at Xiamen tidal gauge station, referenced to 1954−1999 for RCP (4.5,8.5) scenarios
气候情景 当前重现期/a 时间 相同高度未来重现期/a RCP4.5 50 2030年 26 2050年 10 2100年 <1 100 2030年 55 2050年 30 2100年 2 RCP8.5 50 2030年 25 2050年 8 2100年 <1 100 2030年 53 2050年 25 2100年 <1 -
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