Identification of flood-prone areas is a fundamental step for flood risk management. This work focuses on a fast procedure for hazard zoning within the flood-prone areas at a meso-scale in the absence of detailed hydrologic and hydraulic calculations for large areal extents. To this end, a probabilistic methodology for hazard zoning of the potentially flood-prone areas is presented. The main output consists of prompt GIS-compatible maps for the hazard zoning (by flood height) of the potentially flood-prone areas. A flood height-dependent extension of the Topographic Wetness Index (TWI) threshold is proposed as the lower-limit TWI for zones with flood height greater than a given value. This procedure, that starts from a consolidated geomorphic algorithm, relies on calibrating the flood height-dependent TWI threshold through maximum likelihood estimation and inundation maps carried out at micro-scale level for a given spatial window. This calibration is performed for different values of flood depth in order to investigate the correlation between the flood height-dependent TWI threshold and the flood depth conditioned on return period, through simple linear regression. The resulting regression model is used in order to up-scale the results from the micro-scale to the meso-scale level. The procedure is applied for the City of Addis Ababa, Ethiopia and the resulting map of flood hazard zoning is validated for a spatial window not used for calibration purposes.

Meso-scale hazard zoning of potentially flood prone areas / DE RISI, Raffaele; Jalayer, Fatemeh; DE PAOLA, Francesco. - In: JOURNAL OF HYDROLOGY. - ISSN 0022-1694. - 527:(2015), pp. 316-325. [10.1016/j.jhydrol.2015.04.070]

Meso-scale hazard zoning of potentially flood prone areas

DE RISI, RAFFAELE;JALAYER, FATEMEH;DE PAOLA, FRANCESCO
2015

Abstract

Identification of flood-prone areas is a fundamental step for flood risk management. This work focuses on a fast procedure for hazard zoning within the flood-prone areas at a meso-scale in the absence of detailed hydrologic and hydraulic calculations for large areal extents. To this end, a probabilistic methodology for hazard zoning of the potentially flood-prone areas is presented. The main output consists of prompt GIS-compatible maps for the hazard zoning (by flood height) of the potentially flood-prone areas. A flood height-dependent extension of the Topographic Wetness Index (TWI) threshold is proposed as the lower-limit TWI for zones with flood height greater than a given value. This procedure, that starts from a consolidated geomorphic algorithm, relies on calibrating the flood height-dependent TWI threshold through maximum likelihood estimation and inundation maps carried out at micro-scale level for a given spatial window. This calibration is performed for different values of flood depth in order to investigate the correlation between the flood height-dependent TWI threshold and the flood depth conditioned on return period, through simple linear regression. The resulting regression model is used in order to up-scale the results from the micro-scale to the meso-scale level. The procedure is applied for the City of Addis Ababa, Ethiopia and the resulting map of flood hazard zoning is validated for a spatial window not used for calibration purposes.
2015
Meso-scale hazard zoning of potentially flood prone areas / DE RISI, Raffaele; Jalayer, Fatemeh; DE PAOLA, Francesco. - In: JOURNAL OF HYDROLOGY. - ISSN 0022-1694. - 527:(2015), pp. 316-325. [10.1016/j.jhydrol.2015.04.070]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/623060
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