A Bayesian-based system to assess wave-driven flooding hazards on coral reef-lined coasts

Journal of Geophysical Research C: Oceans
By: , and 

Links

Abstract

Many low-elevation, coral reef-lined, tropical coasts are vulnerable to the effects of climate change, sea level rise, and wave-induced flooding. The considerable morphological diversity of these coasts and the variability of the hydrodynamic forcing that they are exposed to make predicting wave-induced flooding a challenge. A process-based wave-resolving hydrodynamic model (XBeach Non-Hydrostatic, “XBNH”) was used to create a large synthetic database for use in a “Bayesian Estimator for Wave Attack in Reef Environments” (BEWARE), relating incident hydrodynamics and coral reef geomorphology to coastal flooding hazards on reef-lined coasts. Building on previous work, BEWARE improves system understanding of reef hydrodynamics by examining the intrinsic reef and extrinsic forcing factors controlling runup and flooding on reef-lined coasts. The Bayesian estimator has high predictive skill for the XBNH model outputs that are flooding indicators, and was validated for a number of available field cases. It was found that, in order to accurately predict flooding hazards, water depth over the reef flat, incident wave conditions, and reef flat width are the most essential factors, whereas other factors such as beach slope and bed friction due to the presence or absence of corals are less important. BEWARE is a potentially powerful tool for use in early warning systems or risk assessment studies, and can be used to make projections about how wave-induced flooding on coral reef-lined coasts may change due to climate change.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title A Bayesian-based system to assess wave-driven flooding hazards on coral reef-lined coasts
Series title Journal of Geophysical Research C: Oceans
DOI 10.1002/2017JC013204
Volume 122
Issue 12
Year Published 2017
Language English
Publisher AGU
Contributing office(s) Pacific Coastal and Marine Science Center
Description 19 p.
First page 10099
Last page 10117