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Storm surges and storm wind waves in the Caspian Sea in the present and future climate
Natural Hazards and Earth System Sciences ( IF 4.6 ) Pub Date : 2021-09-02 , DOI: 10.5194/nhess-2021-244
Anna Pavlova , Stanislav Myslenkov , Victor Arkhipkin , Galina Surkova

Abstract. This study is devoted to the analysis of the storm surges and wind waves in the Caspian Sea for the period from 1979 to 2017–2020. The models used are the circulation model ADCIRC and the wave model WAVEWATCH III with wind and pressure forcing from the NCEP/CFSR reanalysis. The modeling is performed on the unstructured grid with spacing to 300–700 m in the coastal zone. Mean and extreme values of surges, wave parameters, and storm activity are provided. The maximum significant wave height for the whole period amounts to 8.2 m. The average long-term SWH does not exceed 1.1 m. No significant trend in the storm activity was found. The maximum surges height amounts to 2.7 m. Analysis of the interannual variability of the surges occurrence showed that 7–10 surges with a height of more than 1 meter were obtained per year and the total duration of all these surges was 20–30 days per year. Assessment of the risk of coastal flooding was carried out by calculating the extreme values of the Sea for different return periods 5, 10, 25, 50, and 100 years. The extreme sea level values in the northern part of the Caspian Sea for the return period 100 years is close to 3 m and the areas with big surges are located along the eastern and western coasts. Based on climatic scenarios of CMIP5, a forecast is made for the recurrence of storm wind waves in the 21st century. A statistically significant increase of storm waves recurrence in the future was found, but it is not dramatically growing.

中文翻译:

当前和未来气候下里海的风暴潮和风暴风浪

摘要。本研究致力于分析 1979 年至 2017-2020 年期间里海的风暴潮和风浪。使用的模型是环流模型 ADCIRC 和波浪模型 WAVEWATCH III,其中包含来自 NCEP/CFSR 再分析的风和压力强迫。建模是在非结构化网格上进行的,沿海地区的间距为 300-700 m。提供了浪涌、波浪参数和风暴活动的平均值和极值。整个时期的最大有效波高为8.2 m。平均长期 SWH 不超过 1.1 m。没有发现风暴活动的显着趋势。最大浪涌高度为 2.7 m。对浪涌发生年际变化的分析表明,每年有 7-10 次高度超过 1 米的浪涌,所有这些浪涌的总持续时间为每年 20-30 天。通过计算不同重现期 5、10、25、50 和 100 年的海洋极值,对沿海洪水风险进行了评估。回溯期100年里海北部极端海平面值接近3 m,大潮区位于东西海岸。基于CMIP5的气候情景,对21世纪风暴风浪的重现进行了预测。发现未来风暴波复发的统计显着增加,但并没有显着增加。通过计算不同重现期 5、10、25、50 和 100 年的海洋极值,对沿海洪水风险进行了评估。回溯期100年里海北部极端海平面值接近3 m,大潮区位于东西海岸。根据CMIP5的气候情景,对21世纪风暴风浪的重现进行了预测。发现未来风暴波复发的统计显着增加,但并没有显着增加。通过计算不同重现期 5、10、25、50 和 100 年的海洋极值,对沿海洪水风险进行了评估。回溯期100年里海北部极端海平面值接近3 m,大潮区位于东西海岸。基于CMIP5的气候情景,对21世纪风暴风浪的重现进行了预测。发现未来风暴波复发的统计显着增加,但并没有显着增加。回溯期100年里海北部极端海平面值接近3 m,大潮区位于东西海岸。基于CMIP5的气候情景,对21世纪风暴风浪的重现进行了预测。发现未来风暴波复发的统计显着增加,但并没有显着增加。回溯期100年里海北部极端海平面值接近3 m,大潮区位于东西海岸。基于CMIP5的气候情景,对21世纪风暴风浪的重现进行了预测。发现未来风暴波复发的统计显着增加,但并没有显着增加。
更新日期:2021-09-02
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