Open AccessTide-rainfall flood quotient: an incisive measure of comprehending a region’s response to storm-tide and pluvial flooding
Author(s) -
Mohit Prakash Mohanty,
Mazhuvanchery Avarachen Sherly,
Subimal Ghosh,
Subhankar Karmakar
Publication year - 2020
Publication title -
environmental research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.37
H-Index - 124
ISSN - 1748-9326
DOI - 10.1088/1748-9326/ab8092
Subject(s) - coastal flood , pluvial , flood myth , storm , flooding (psychology) , storm surge , environmental science , climatology , tropical cyclone , 100 year flood , hydrology (agriculture) , meteorology , climate change , geography , oceanography , geology , sea level rise , psychology , geotechnical engineering , archaeology , psychotherapist
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 prove useful in rationalizing long-term flood management strategies customizable for storm-tide and pluvial dominated global coastal regions.