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Assessment of the Vulnerability of the Southwestern Coast of Benin to the Risk of Coastal Erosion and Flooding

Journal of Water Resource and Protection 2023年第1期15卷 1-22页

作者： Tinonkiyè Sylvestre Yantikoua Christophe Kaki Moussa Bio Djara Gerard Alfred Franck d’Ameida Laboratory of Geology Mines and Environment Department of Earth Sciences University of Abomey-Calavi (LGME/FAST/UAC) Abomey-Calavi Benin Postgraduate School of Life and Earth Sciences University of Abomey-Calavi (ED-SVT/UAC) Abomey-Calavi Benin

The coastal zone of Benin is inherited from the last marine oscillations of the Quaternary. A rich and very fragile environment, it presented until the 1960s, a shoreline in dynamic equilibrium over the entire 125 km of coastal line. Since the 1960s, with the construction of important development infrastructures (ports, dams, groins), the Beninese coast is now subject to risks of coastal erosion and seasonal flooding due to the overflow of lagoon water bodies. The present study, based on socio-economic surveys in the communes of Ouidah, Comè and Grand Popo, exposes the extent of coastal risks and socio-economic and environmental damage in the southwestern coastal zone of Benin. The results show that in terms of land, 2.9 ha and 5.7 ha of land have been permanently lost to coastal erosion in the communes of Ouidah and Grand Popo respectively. Similarly, 212 ha of crops of all types were affected by the flooding, including 35 ha destroyed, i.e. 6.67 ha, 11.3 ha in Comè, 4.67 ha Ouidah and 14 ha Grand Popo. Also, 6435 buildings were affected, and 4235 huts were damaged. In addition, working tools, food stocks and other items are counted among the losses recorded by coastal hazards with their corollaries of diseases. The cost of losses and damages in the 08 districts amount to 418,000,000f cfa of which 266,000,000f cfa of damage and 152,000,000f cfa of loss.

关键词： Beninese Coast Coastal Erosion Floods socio-economic surveys Impacts of Coastal Risks

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