Calculation of extreme water level with the effect of sea level rise
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摘要: 本研究基于非平稳序列极值理论,定量分析极端水位事件年超越概率受海平面上升的影响;以工程设计使用年限内极端水位发生概率作为控制条件,构建考虑海平面上升的极值水位计算方法;结合平均海平面的长期变化过程,推算海平面上升下的极值水位。基于全球10个验潮站历史水位观测资料,验证历史平均海平面长期变化与高、低水位耿贝尔分布位置参数变化的一致性以及构建方法的合理性。结合政府间气候变化专门委员会对海平面上升的预测,推算和对比分析不同海平面上升情景下的极值水位,并评估相应极值水位在当前极值分布中的重现期。Abstract: Based on the extreme value theory of non-stationary sequences, this study carried out the quantitative analysis of the effect of sea level rise on the exceedance probability of extreme water levels. A new method for the estimation of extreme water level with sea level rise was proposed by adopting the overall exceedance probability of extreme water level within the design lifetime of coastal facilities as a critical constraint. With the incorporation of sea level rise in the location parameter of Gumbel distribution, the new method allows the adjustment of the annual exceedance probability of extreme water levels along with sea level rise over time. The validity of the proposed method was examined using the long term sea level measurement data at 10 tide gauge stations globally. Using the five global mean sea level rise scenarios projected by IPCC, the extreme water levels for different design lifetime of coastal facilities with sea level rise were estimated, and the return periods of the extreme water levels were also evaluated.
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图 4 62 a滑动时窗下澳门验潮站平均海平面和高、低水位耿贝尔分布位置参数历时曲线
图中平均海平面和高、低水位耿贝尔分布位置参数均为减去相应历时范围内平均值的结果
Fig. 4 Time series of mean sea level and location parameters of Gumbel distribution with the 62 a running time window at Macao tide gauge station
The mean sea level and location parameters of Gumbel distribution are results subtracted by the corresponding time averaged values
图 5 62 a滑动时窗下各验潮站高水位位置参数(实线)与去除年平均海平面的高水位位置参数和相应平均海平面线性叠加(虚线)的比较
图中各高水位位置参数为减去相应历时范围内平均值的结果
Fig. 5 Comparison between location parameters of the Gumbel distribution for the annual high water levels (solid lines) and the linear summation of mean sea level and location parameters of the Gumbel distribution for the annual high water levels subtracted by annual mean sea level (dash lines)
The location parameters of Gumbel distribution are results subtracted by the corresponding time-averaged values
图 7 不同温室气体排放情景下全球海平面相对于2020年的上升预测
根据IPCC第6次评估报告[1]中图SPM.8(d)修改,仅给出各温室气体排放情景下海平面上升预测中值
Fig. 7 Prediction of the global mean sea level rise relative to the year of 2020 under different greenhouse gas emission scenarios
The plot is adapted from Figure SMP.8(d) in the IPCC AR6[1] and only the medium values of the prediction results for different greenhouse gas emission scenarios were given
图 8 不同温室气体排放情景下澳门验潮站处各工程设计使用年限极值高、低水位比较
实线为采用本文构建方法计算的考虑海平面上升的极值水位(结合IPCC第6次评估报告中对海平面上升的预测),虚线以当前极值水位线性叠加工程设计使用年限内IPCC对海平面上升的预测值作为极值水位,黑色圆点线(NoSLR)为不考虑海平面上升的极值水位
Fig. 8 Comparion of extreme high and low water levels for different design lifetime under different greenhouse gas emission scenarios at Macao tide gauge station
The solid lines represent results using the method constructed in this paper; the dash lines represent results by adding the predicted mean sea level rise within the design lifetime to the current extreme water level without considering sea-level rise; the black dotted lines represent results without considering sea level rise
图 9 工程设计使用年限为50 a时不同温室气体排放情景下各验潮站极值高、低水位比较
图中极值高/低水位差值为各验潮站极值高/低水位减去相应验潮站处温室气体极低排放情景(SSP1-1.9)下本文构建方法计算的“IPCC预测趋势”下极值高/低水位的值
Fig. 9 Comparison of extreme high and low water levels for the design lifetime of 50 a under different greenhouse gas emission scenarios
The difference of extreme high/low water levels are the extreme high/low water levels subtracted by the results calculated by the method constructed in this paper under the greenhouse gas emission scenario SSP1-1.9 at the corresponding tide gauge stations
图 10 工程设计使用年限为50 a时各验潮站处不同方法推算的极值高、低水位在当前极值分布(2020年)中的重现期
白色填充部分由2020年极值高、低水位线性叠加工程设计使用年限内IPCC海平面上升预测值作为极值水位推算得到;阴影部分由采用本文构建方法、结合IPCC海平面上升预测计算的极值水位推算得到
Fig. 10 Return periods of extreme high and low water levels with the design lifetime of 50 a in the current extreme value distribution (the year of 2020) estimated by different methods
The white-filled area denotes the summation of extreme high/low water level and the predicted sea-level rise within the design lifetime of coastal facilities by IPCC; the shaded area denotes extreme high/low water level estimated by the method proposed in this study based on the predicted sea-level rise by IPCC
表 1 验潮站及相应水位资料信息
Tab. 1 Tide gauge stations and the corresponding water level data information
序号 验潮站 位置 水位数据覆盖年限 水位数据序列长度/a 1 哈利法克斯(Halifax) 44.667°N, 63.583°W 1920–2013 94 2 波士顿(Boston) 42.353°N, 71.053°W 1922–2019 98 3 纽波特(Newport) 41.505°N, 71.327°W 1931–2019 89 4 波特兰(Portland) 43.657°N, 70.247°W 1912–2019 108 5 查尔斯顿(Charleston) 32.782°N, 79.925°W 1922–2019 98 6 维多利亚(Victoria) 48.417°N, 123.367°W 1909–2018 110 7 洛杉矶(Los Angeles) 33.720°N, 118.272°W 1924–2019 96 8 旧金山(San Francisco) 7.807°N, 122.465°W 1898–2016 119 9 库克斯港(Cuxhaven) 53.867°N, 8.717°E 1918–2018 101 10 澳门(Macao) 22.200°N, 113.550°E 1925–2017 93 表 2 62 a滑动时窗下各验潮站平均海平面与高、低水位位置参数的皮尔逊相关系数
Tab. 2 Pearson correlation coefficient of mean sea level and location parameters for the annual high and low water level with the 62 a running time window at the 10 tide gauge stations
验潮站 高水位位置参数 低水位位置参数 哈利法克斯(Halifax) 0.992 0 0.998 2 波士顿(Boston) 0.994 8 0.991 6 纽波特(Newport) 0.997 2 0.991 4 波特兰(Portland) 0.997 0 0.974 9 查尔斯顿(Charleston) 0.996 6 0.918 9 维多利亚(Victoria) 0.944 5 0.805 2 洛杉矶(Los Angeles) 0.984 8 0.814 1 旧金山(San Francisco) 0.995 6 0.985 4 库克斯港(Cuxhaven) 0.969 7 0.890 2 澳门(Macao) 0.978 5 0.966 5 表 3 62 a滑动时窗下各验潮站平均海平面和高、低水位位置参数线性上升速率
Tab. 3 Linear trends of mean sea-level and location parameters for the annual high and low water level with the 62 a running time window at the 10 tide gauge stations
验潮站 线性上升速率/(cm·a−1) 平均海平面 高水位位置参数 低水位位置参数 哈利法克斯(Halifax) 0.317 0.305 0.387 波士顿(Boston) 0.262 0.341 0.256 纽波特(Newport) 0.271 0.385 0.245 波特兰(Portland) 0.187 0.281 0.164 查尔斯顿(Charleston) 0.316 0.325 0.145 维多利亚(Victoria) 0.084 0.114 0.075 洛杉矶(Los Angeles) 0.085 0.072 0.047 旧金山(San Francisco) 0.200 0.247 0.148 库克斯港(Cuxhaven) 0.200 0.606 0.266 澳门(Macao) 0.163 0.319 0.217 表 4 各验潮站2020年高水位极值的耿贝尔分布拟合结果
Tab. 4 The fitting results of location parameters of Gumbel distribution in the year of 2020 for the annual high water level at the 10 tide gauge stations
参数验潮站 位置参数/cm 尺度参数/cm 极值水位/cm 25 a一遇 50 a一遇 80 a一遇 100 a一遇 哈利法克斯(Halifax) 234.4 12.0 272.8 281.2 286.9 289.6 波士顿(Boston) 496.6 15.7 546.8 557.9 565.3 568.8 纽波特(Newport) 233.5 14.4 279.6 289.7 296.5 299.7 波特兰(Portland) 634.0 12.1 672.7 681.2 686.9 689.7 查尔斯顿(Charleston) 311.4 14.9 359.1 369.5 376.6 379.9 维多利亚(Victoria) 330.3 12.2 369.3 377.9 383.7 386.4 洛杉矶(Los Angeles) 336.2 5.3 353.2 356.9 359.4 360.6 旧金山(San Francisco) 405.6 9.6 436.3 443.1 447.6 449.8 库克斯港(Cuxhaven) 837.0 44.2 978.4 1 009.5 1 030.4 1 040.3 澳门(Macao) 340.2 30.4 437.4 458.8 473.2 480.0 表 5 各验潮站2020年低水位极值的耿贝尔分布拟合结果
Tab. 5 The fitting results of location parameters of Gumbel distribution in the year of 2020 for the annual low water level at the 10 tide gauge stations
参数验潮站 位置参数/cm 尺度参数/cm 极值水位/cm 25 a一遇 50 a一遇 80 a一遇 100 a一遇 哈利法克斯(Halifax) –26.5 7.7 –35.5 –37.0 –37.9 –38.3 波士顿(Boston) 26.0 9.5 14.9 13.0 12.0 11.5 纽波特(Newport) –7.5 10.6 –19.9 –22.0 –23.2 –23.7 波特兰(Portland) 186.5 7.9 177.3 175.7 174.8 174.4 查尔斯顿(Charleston) 7.6 11.3 –5.6 –7.8 –9.1 –9.7 维多利亚(Victoria) –24.1 10.5 –36.4 –38.4 –39.6 –40.1 洛杉矶(Los Angeles) 57.0 4.9 51.3 50.3 49.8 49.5 旧金山(San Francisco) 119.5 6.7 111.7 110.4 109.6 109.3 库克斯港(Cuxhaven) 212.4 30.4 176.9 170.9 167.5 166.0 澳门(Macao) 28.4 12.3 14.0 11.6 10.2 9.6 -
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