Impact of climate change on tropical cyclone wind and wave hazards and structural reliability of offshore wind turbines along the southeast coast of China

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
C. Sheng , Y.B. Zhang , H. Cheng , K.S. Dai
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引用次数: 0

Abstract

Climate change is expected to influence tropical cyclone (TC) activity, posing risks to offshore wind turbine (WT) structural reliability and codified design. However, few studies have assessed the joint TC wind and wave hazards along the southeast coast of mainland China under projected climate change, and their implications for reliability-based offshore WT design have not been explored. This study developed a computationally efficient, physics-based TC modelling framework and applied it to an ensemble of climate projections from six general circulation models (GCMs) under the Shared Socioeconomic Pathway 5–8.5 scenario. Results indicate a robust statistically significant (95% confidence level) upward trend in the annual occurrence rate of strong TCs, although inter-model variability remains substantial. Spatial-temporal analyses of TC track density and 0.75-quantile maximum winds consistently show increasing trends. Regionally averaged 50- and 500-year return period values for both wind and wave are projected to rise by 6% and 5%, respectively, from the near future (2015–2044) to the long-term future (2073–2100). A Gaussian copula is identified as an appropriate model for modelling joint TC wind and wave annual maxima, and the obtained environmental contours reveal escalated multi-hazard risks——primarily driven by increased TC severity rather than changes in correlation strength. Reliability analysis demonstrates that neither current International Electrotechnical Commission-recommended TC design values nor historically derived 50-year site-specific return period values could adequately ensure target offshore WT structural safety. However, implementing long-term future wind and wave hazards for the design can achieve sufficient reliability. This study provides important insights into future TC multi-hazards for the southeast coast of mainland China and establishes a basis for improving reliability-based offshore WT design to mitigate climate change risks.
气候变化对中国东南沿海热带气旋风浪危害及海上风力机结构可靠性的影响
气候变化预计会影响热带气旋(TC)的活动,给海上风力涡轮机(WT)的结构可靠性和规范化设计带来风险。然而,很少有研究评估预测气候变化下中国大陆东南沿海的联合TC风浪危害,并且尚未探讨其对基于可靠性的海上WT设计的影响。本研究开发了一个计算效率高、基于物理的TC建模框架,并将其应用于共享社会经济路径5-8.5情景下六个环流模式(GCMs)的气候预估组合。结果表明,尽管模式间变异仍然很大,但强tc的年发生率在统计上显著(95%置信水平)呈上升趋势。TC路径密度和0.75分位最大风的时空分析一致显示出增加的趋势。从近期(2015-2044年)到长期(2073-2100年),区域平均50年和500年的风和浪回归期值预计分别上升6%和5%。高斯耦合模型被认为是模拟联合TC风浪年极大值的合适模型,得到的环境等高线显示了多灾害风险的升级——主要是由TC严重程度的增加而不是相关强度的变化驱动的。可靠性分析表明,无论是目前国际电工委员会推荐的TC设计值,还是历史上得出的50年现场特定回复期值,都不能充分确保海上WT结构的目标安全。然而,考虑到未来长期的风浪危害,设计可以获得足够的可靠性。该研究为未来中国大陆东南沿海的多灾害灾害提供了重要见解,并为改进基于可靠性的海上WT设计以减轻气候变化风险奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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