Abstract
In recent years, marine flooding and its impacts have become a question of growing interest, since coastal areas are the most heavily populated and developed land zones in the world. This paper presents a rapid tool for mapping at regional scale the hazard associated with coastal flooding due to overflow. The tool merges a recently developed numerical model that solves a simplified form of the Shallow-Water Equations and is suited for Graphic Processing Unit (GPU) acceleration, with a Level II reliability method that allows producing hazard maps of inland flooding propagation. The procedure was applied to two stretches of the Venetian littoral, i.e., Valle Vecchia and Caorle, located in the northern Adriatic Sea. The application includes the site descriptions and the resulting hazard maps that show the probability of failure in each point of the coast for a given inland inundation level.
Highlights
The EU water flood directive (2007/60/EC) points out the importance of evaluating coastal flooding hazard maps
The application includes the site descriptions and the resulting hazard maps that show the probability of failure in each point of the coast for a given inland inundation level
This paper presents a numerical model for the inland flood propagation and an approach for the assessment of coastal flooding vulnerability
Summary
The EU water flood directive (2007/60/EC) points out the importance of evaluating coastal flooding hazard maps. Some authors predicted that sea-levels and subsidence will rise [1] and storm surge intensity will increase [2,3]. It is possible that, in the near future, many human infrastructures will be affected by marine flooding and, assuming the coastal population will grow [4], tools for risk mitigations are deemed necessary. Coastal flooding may be triggered by many causes, possibly in combination: (i) high sea level (and wave run-up) overtopping the artificial dikes/barriers or natural dunes; (ii) breaching of cliffs, dunes or more generally erosion of the coastal defence; (iii) river overflow; and (iv) rain excess or insufficient drainage system. Breaching is very difficult to predict, since it reasonably depends on the (spatially distributed) geotechnical characteristics of the coastal dunes and, for instance, on the presence of vegetation or type of revetment
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