A Model of Coastal Flooding Using Linearized Bottom Friction and Its Application to a Case Study in Caorle, Venice, Italy
- Chiara Favaretto (University of Padova) | Luca Martinelli (University of Padova) | Piero Ruol (University of Padova)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- June 2019
- Document Type
- Journal Paper
- 182 - 190
- 2019. The International Society of Offshore and Polar Engineers
- GPU, raster-based, Venetian littoral, coastal flooding, Caorle, shallow water equations
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- 2 since 2007
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This paper presents a recently developed flood propagation model. In order to use graphics processing unit (GPU) acceleration, (i) the domain shallow water equations are simplified by linearizing bottom friction and neglecting advection, and (ii) an appropriate vectorization method is implemented. The model solves the finite difference scheme for each pixel of large-scale raster maps (i.e., regional or national ones). It was initially tested against a well-known benchmark and was then applied to a coastal flooding event in the Caorle area, Venice, Italy, which occurred in December 2008.
Many available studies (e.g., Hinkel et al., 2014; Weisse et al., 2014), including the most recent assessment by the IPCC (2015), show that European coasts are threatened by rising sea levels and climate change. Coastal areas are subject to the risks of both flooding and erosion. The vulnerability stemming from these hazards needs to be adequately investigated in order to mitigate the risk to human health, economic activities, cultural heritage, and the environment.
Therefore, under the EU Floods Directive, stakeholders need to establish flood maps to determine the risk of present and future levels of inundation. This issue is particularly relevant to the Northern Adriatic coast, where local managers require tools, possibly integrated to geographic information system (GIS), to simulate the complex problem of a coastal flood caused by waves overtopping in an urban area at regional level. This gave impulse to major EU projects, such as THESEUS (Zanuttigh, 2011), MICORE (Ciavola et al., 2011), and RISC-KIT (Armaroli and Duo, 2017).
|File Size||4 MB||Number of Pages||9|