It is undeniable that coastal regions worldwide are facing unprecedented damages from catastrophic floods attributable to storm-tide (tidal) and extreme rainfall (pluvial). For flood-risk assessment, although recognizing compound impact of these drivers is a conventional practice, the marginal/individual impacts cannot be overlooked. In this letter, we propose a new measure, Tide-Rainfall Flood Quotient (TRFQ), to quantify the driver-specific flood potential of a coastal region arising from storm-tide or rainfall. A set of inundation and hazard maps are derived through a series of numerical and hydrodynamic flood model simulations comprising of design rainfall and design storm-tide. These experiments are demonstrated on three different geographically diverse flood-affected coastal regions in India. The new measure throws light on existing knowledge gaps on the propensity of coastal flooding induced by the marginal/individual contribution of storm-tide and rainfall. It shall prov...

中文翻译：

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潮汐洪水商：了解该地区对风暴潮和暴雨洪水的反应的一种敏锐措施

不可否认，由于风暴潮（潮汐）和极端降雨（暴雨），全球沿海地区正遭受灾难性洪水的前所未有的破坏。对于洪水风险评估，尽管通常会认识到这些驱动因素的复合影响，但边际/个体影响却不能忽略。在这封信中，我们提出了一种新的措施，即潮汐雨量洪水商数（TRFQ），以量化由风暴潮或降雨引起的沿海地区特定驾驶员的洪水潜力。通过一系列包括设计降雨和设计风暴潮的数值和水动力洪水模型模拟，得出了一组淹没图和灾害图。这些实验已在印度三个受不同地理因素影响的沿海地区得到证明。这项新措施揭示了由风暴潮和降雨的边际/个体贡献引起的关于沿海洪灾倾向的现有知识空白。它应提供...