| Popis: |
In view of the economic, social, environmental and human damage caused, the study of the risk of marine submersion is becoming a necessity for the protection of coastal communities. Today, submersion is one of the main environmental constraints on coastlines, especially urbanized ones. It would therefore be useful to identify areas where the coastline is likely to be crossed by storm waves. To determine crossing thresholds, we have compared the values of NM + Rmax (maximum sea level during the episode at the Dakar tide gauge + extreme runup potential) of modelled marine submersions and the altitude of the coast line (edge of the land level above the sea or top of a protective wall), in order to identify sectors that appear to be at potential risk of submersion by crossing according to our data. This approach is relevant for studying the risk of overtopping. If we focus on the potential for wave overtopping, which depends on the physical characteristics of the coastline under study, notably the height of the coastline, our results from modelling the extreme water level for the 5 events selected show unequal exposure to the risk of coastal flooding and potential overtopping in some places, while in others the coastline is high enough to make overtopping difficult or even impossible. |
