Towards an Integrated Approach for Coastal Flood Impact Assessment

Thomalla, Frank; Brown, James Dean; Kelman, Ilan; Möller, Iris; Spence, Robin; Spencer, Tom

doi:10.1061/40605(258)14

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Gallien [34] collected wave overtopping flood validation data and showed that empirical and numerical estimates performed similarly despite order of magnitude differences in total overtopped volume, suggesting that a few large waves in succession (likely resulting from the combined effects of incident and infragravity waves) dominated backshore flooding. Indeed, wave overtopping is considered a significant deficiency in the current modeling methodology [28,121,122], and multiple studies stress the need for field validation data [29,32,62,168,211,212].…”

Section: Overtopping Flood Validationmentioning

confidence: 99%

“…However, there are no known quantitative hydrodynamically field-validated coastal flooding models. Multiple studies stress the need for field validation data [21,29,32,168,211,212]. A paucity of in-situ hydrodynamic validation (depth, velocity, flood arrival time) inhibits accurate urban coastal flood modeling and prediction [34,169].…”

Section: Hydrodynamic Validationmentioning

confidence: 99%

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Coastal Flood Modeling Challenges in Defended Urban Backshores

et al. 2018

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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.

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