The 21st august 2020 flood in Douala (Cameroon) : a major urban flood investigated with 2D HEC-RAS modeling

Iroume, J. Y. A.; Onguene, R.; Koffi, F. D.; Colmet-Daage, A.; /Stieglitz, Thomas; Sone, W. E.; Bogning, S.; Olinga, J. M. O.; Ntchantcho, R.; Ntonga, J. C.; /Braun, Jean-Jacques; Briquet, J. P.; Etame, J.

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dc.creator	Iroume, J. Y. A.
dc.creator	Onguene, R.
dc.creator	Koffi, F. D.
dc.creator	Colmet-Daage, A.
dc.creator	/Stieglitz, Thomas
dc.creator	Sone, W. E.
dc.creator	Bogning, S.
dc.creator	Olinga, J. M. O.
dc.creator	Ntchantcho, R.
dc.creator	Ntonga, J. C.
dc.creator	/Braun, Jean-Jacques
dc.creator	Briquet, J. P.
dc.creator	Etame, J.
dc.date	2022
dc.date.accessioned	2022-10-14T18:38:28Z
dc.date.available	2022-10-14T18:38:28Z
dc.identifier	https://www.documentation.ird.fr/hor/fdi:010085267
dc.identifier	oai:ird.fr:fdi:010085267
dc.identifier	Iroume J. Y. A., Onguene R., Koffi F. D., Colmet-Daage A., Stieglitz Thomas, Sone W. E., Bogning S., Olinga J. M. O., Ntchantcho R., Ntonga J. C., Braun Jean-Jacques, Briquet J. P., Etame J.. The 21st august 2020 flood in Douala (Cameroon) : a major urban flood investigated with 2D HEC-RAS modeling. 2022, 14 (11), p. 1768 [19 p.]
dc.identifier.uri	https://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/169910
dc.description	A major flood event occurred on 21 August 2020 in the densely populated Makepe Missoke neighborhood in the city of Douala (Cameroon, Africa). Nearly 2210 buildings and 12,376 victims spread over 82 hectares were affected. A 2D HEC-RAS model is applied to simulate and characterize this event. A cross analysis of flood depth and flow velocity is used to classify the flood risk and identify areas exposed from low to high hazard. The simulations provide detailed information on the flood characteristics (extent, depth, velocity, arrival time, and duration). The simulated maximum water surface profiles are consistent with the floods marks with differences ranging from 0.02 m to 0.44 m, indicating a good agreement between the observed and simulated water levels at the peak flow (NSE = 0.94, Erel = 0.92, RMSE = 0.21 m). The maximum inundation level is 4.48 m and the flow velocity is globally low at less than 1 m/s. The average flood arrival time and duration are 5 h and 26 h, respectively, for a threshold height of 0.5 m. These results indicate a fast mobilization of the major river channel for the evacuation of this flood. The level of accuracy of the developed model of the 21 August 2020 flood event is appropriate for flood hazard assessment in the city of Douala and is designed to find operational application in future events.
dc.language	EN
dc.subject	flood hazard assessment
dc.subject	HEC-RAS
dc.subject	hydraulic modeling
dc.subject	Tongo Bassa
dc.subject	watershed
dc.subject	urban floods
dc.title	The 21st august 2020 flood in Douala (Cameroon) : a major urban flood investigated with 2D HEC-RAS modeling
dc.type	text
dc.coverage	CAMEROUN
dc.coverage	DOUALA