The delineation of flood-prone areas is one of the most important steps for flood risk assessment and mitigation. This study uses a probabilistic and DEM-based framework for the delineation of flood-prone areas based on information about the extent of historical flooding in the area of interest. This is particularly useful for the delineation of flood-prone areas in cases where more accurate hydraulic profile calculations are not available. The delineation of flood-prone areas is carried out by using the Topographic Wetness Index (TWI) which allows for the delineation of a portion of a hydrographic basin potentially exposed to flooding by identifying all the areas characterized by a topographic index that exceeds a given threshold. A Bayesian updating framework is used for estimating the TWI threshold for identifying the flood-prone areas based on available information on the spatial extent of historical flooding. An application of the proposed method is demonstrated for the delineation of potentially flood-prone areas in the city of Ouagadougou, based on the observed spatial extent of the 2009 flooding event in the city.

Probabilistic Delineation of Flood-prone areas based on a Digital Elevation Model and the Extent of Historical Flooding: The case of Ouagadougou / DE RISI, Raffaele; Jalayer, Fatemeh; DE PAOLA, Francesco; Giugni, Maurizio. - In: BOLETIN GEOLOGICO Y MINERO. - ISSN 0366-0176. - 125:3(2014), pp. 331-342.

Probabilistic Delineation of Flood-prone areas based on a Digital Elevation Model and the Extent of Historical Flooding: The case of Ouagadougou

DE RISI, RAFFAELE;JALAYER, FATEMEH;DE PAOLA, FRANCESCO;GIUGNI, MAURIZIO
2014

Abstract

The delineation of flood-prone areas is one of the most important steps for flood risk assessment and mitigation. This study uses a probabilistic and DEM-based framework for the delineation of flood-prone areas based on information about the extent of historical flooding in the area of interest. This is particularly useful for the delineation of flood-prone areas in cases where more accurate hydraulic profile calculations are not available. The delineation of flood-prone areas is carried out by using the Topographic Wetness Index (TWI) which allows for the delineation of a portion of a hydrographic basin potentially exposed to flooding by identifying all the areas characterized by a topographic index that exceeds a given threshold. A Bayesian updating framework is used for estimating the TWI threshold for identifying the flood-prone areas based on available information on the spatial extent of historical flooding. An application of the proposed method is demonstrated for the delineation of potentially flood-prone areas in the city of Ouagadougou, based on the observed spatial extent of the 2009 flooding event in the city.
2014
Probabilistic Delineation of Flood-prone areas based on a Digital Elevation Model and the Extent of Historical Flooding: The case of Ouagadougou / DE RISI, Raffaele; Jalayer, Fatemeh; DE PAOLA, Francesco; Giugni, Maurizio. - In: BOLETIN GEOLOGICO Y MINERO. - ISSN 0366-0176. - 125:3(2014), pp. 331-342.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/596968
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