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Title

Reconstituting past flood events: the contribution of citizen science

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Published in Hydrology and Earth System Sciences. 2020, vol. 24, no. 1, p. 61-74
Abstract Information gathered on past flood events is essential for understanding and assessing flood hazards. In this study, we present how citizen science can help to retrieve this information, particularly in areas with scarce or no authoritative measurements of past events. The case study is located in Yeumbeul North (YN), Senegal, where flood impacts represent a growing concern for the local community. This area lacks authoritative records on flood extent and water depth as well as information on the chain of causative factors. We developed a framework using two techniques to retrieve information on past flood events by involving two groups of citizens who were present during the floods. The first technique targeted the part of the citizens' memory that records information on events, recalled through narratives, whereas the second technique focused on scaling past flood event intensities using different parts of the witnesses' bodies. These techniques were used for three events that occurred in 2005, 2009 and 2012. They proved complementary by providing quantitative information on flood extents and water depths and by revealing factors that may have contributed to all three flood events.
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Full text
Structures
Research groups Envirospace Lab
Global Resource Information Database (GRID)
ISE Pôle Sciences
ISE Pôle Informatique environnementale
TIGERS
Laboratoire InfoGéo
Pôle/Institut Gouvernance de l'environnement et développement territorial (PI-GEDT)
Physical Volcanology and Geological Risk
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(ISO format)
SY, Bocar et al. Reconstituting past flood events: the contribution of citizen science. In: Hydrology and Earth System Sciences, 2020, vol. 24, n° 1, p. 61-74. doi: 10.5194/hess-24-61-2020 https://archive-ouverte.unige.ch/unige:128670

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Deposited on : 2020-01-13

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