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Geosciences 2018, 8(12), 450; https://doi.org/10.3390/geosciences8120450

Coastal Flood Modeling Challenges in Defended Urban Backshores

Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA
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Received: 1 November 2018 / Revised: 25 November 2018 / Accepted: 26 November 2018 / Published: 1 December 2018
(This article belongs to the Special Issue River, Urban, and Coastal Flood Risk)
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Abstract

Coastal flooding is a significant and increasing hazard. There are multiple drivers including rising coastal water levels, more intense hydrologic inputs, shoaling groundwater and urbanization. Accurate coastal flood event prediction poses numerous challenges: representing boundary conditions, depicting terrain and hydraulic infrastructure, integrating spatially and temporally variable overtopping flows, routing overland flows and incorporating hydrologic signals. Tremendous advances in geospatial data quality, numerical modeling and overtopping estimation have significantly improved flood prediction; however, risk assessments do not typically consider the co-occurrence of multiple flooding pathways. Compound flooding refers to the combined effects of marine and hydrologic processes. Alternatively, multiple flooding source–receptor pathways (e.g., groundwater–surface water, overtopping–overflow, surface–sewer flow) may simultaneously amplify coastal hazard and vulnerability. Currently, there is no integrated framework considering compound and multi-pathway flooding processes in a unified approach. State-of-the-art urban coastal flood modeling methods and research directions critical to developing an integrated framework for explicitly resolving multiple flooding pathways are presented. View Full-Text
Keywords: coastal flooding; wave overtopping; infrastructure; overland flow; compound flooding; multi-pathway flooding coastal flooding; wave overtopping; infrastructure; overland flow; compound flooding; multi-pathway flooding
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Gallien, T.W.; Kalligeris, N.; Delisle, M.-P.C.; Tang, B.-X.; Lucey, J.T.D.; Winters, M.A. Coastal Flood Modeling Challenges in Defended Urban Backshores. Geosciences 2018, 8, 450.

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