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Predicting wave overtopping thresholds on coral reef-island shorelines with future sea-level rise

机译:预测未来海平面上升时珊瑚礁岛海岸线的波浪超顶阈值

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摘要

Wave-driven flooding is a serious hazard on coral reef-fringed coastlines that will be exacerbated by global sea-level rise. Despite the global awareness of atoll island vulnerability, little is known about the physical processes that control wave induced flooding on reef environments. To resolve the primary controls on wave-driven flooding at present and future sea levels, we present a globally applicable method for calculating wave overtopping thresholds on reef coastlines. A unique dataset of 60,000 fully nonlinear wave transformation simulations representing a wide range of wave energy, morphology and sea levels conditions was analysed to develop a tool for exploring the future trajectory of atoll island vulnerability to sea-level rise. The proposed reef-island overtopping threshold (RIOT) provides a widely applicable first-order assessment of reef-coast vulnerability to wave hazards with sea-level. Future overtopping thresholds identified for different atoll islands reveal marked spatial variability and highlight distinct morphological characteristics that enhance coastal resilience.
机译:波浪驱动的洪水对珊瑚礁繁茂的海岸线构成严重危害,全球海平面上升将加剧该威胁。尽管全球都对环礁岛的脆弱性有了认识,但对于控制波浪在礁石环境中引发洪水的物理过程知之甚少。为了解决当前和未来海平面上波浪驱动洪水的主要控制措施,我们提出了一种全球适用的方法来计算礁石海岸线上波浪超顶阈值。分析了一个独特的数据集,该数据集代表了广泛的波能,形态和海平面条件,包含60,000个完全非线性的波转换模拟,以开发一种工具来探索环礁岛对海平面上升的脆弱性的未来轨迹。拟议中的礁岛超标阈值(RIOT)为礁海岸对海平面波浪危害的脆弱性提供了广泛适用的一阶评估。为不同的环礁岛确定的未来超车阈值揭示了明显的空间变异性,并突出了增强沿海弹性的独特形态特征。

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