What controls physical vulnerability to geo-hydrological hazards?: a contribution to quantitative assessment of landslide and flood risk in western Uganda

dc.contributor.authorSekajugo, John
dc.contributor.authorKagoro-Rugunda, Grace
dc.contributor.authorMutyebere, Rodgers
dc.contributor.authorKabaseke, Clovis
dc.contributor.authorMubiru, David
dc.contributor.authorNamara, Esther
dc.contributor.authorKanyiginya, Violet
dc.contributor.authorBwambale, Bosco
dc.contributor.authorJacobs Jacobs, Liesbet
dc.contributor.authorDewitte, Olivier
dc.contributor.authorKervyn, Matthieu
dc.date.accessioned2024-05-16T13:05:31Z
dc.date.available2024-05-16T13:05:31Z
dc.date.issued2023-05
dc.description.abstractGeo-hydrological hazards (landslides and floods) are often associated with significant damages on physical infrastructure like buildings and roads. Understanding the factors controlling the extent of damage is a prerequisite for quantitatively estimating risk and its spatial distribution, and advising on measures to reduce vulnerability. In this study we document the impact of 64 landslide and six flood events in four selected districts in western Uganda for the period May 2019 - March 2021 through extensive fieldwork. We quantify in economic value the physical damage of landslide and flood hazards on exposed buildings, roads and bridges. We then analyse the physical vulnerability based on damage ratios and determine the factors (building material, hazard characteristics and age of the building) that control the degree of damage using fractional logistic regression. Out of the 91 buildings affected by landslides, 54% were totally destroyed, and only 10% not or minorly damaged, for an average damage cost of 3,179 USD/building. For the 212 documented buildings affected by floods, 35% were totally destroyed, 28% had severe to moderate damage and the rest were minorly or not affected, with an average damage costs of 1,755 USD/building. The physical vulnerability of buildings to landslides depends on the size of the landslide, age of the building, type of building wall material and the steepness of the slope cut to establish an artificial foundation platform. On the other hand, the physical vulnerability of buildings to flood hazards is largely controlled by the flood depth, the distance from the river channel, slope, size of flooded area and type of floor material. The physical vulnerability functions developed in this study are being used as a new inputs into a regional quantitative model of geo-hydrological risks. Combining the hazard estimates with the most accurate information on exposure of physical infrastructure, will facilitate the identification of the types of events and the locations that require most attention for risk reduction.en_US
dc.identifier.otherDOI: 10.5194/egusphere-egu23-4537
dc.identifier.urihttp://hdl.handle.net/20.500.12280/3159
dc.language.isoenen_US
dc.publisherEuropean Geosciences Unionen_US
dc.relation.ispartofseries25th EGU General Assembly;
dc.subjectGeohydrological hazardsen_US
dc.subjectLandslides hazardsen_US
dc.subjectFloods hazardsen_US
dc.subjectBuildingsen_US
dc.subjectRoadsen_US
dc.subjectBridgesen_US
dc.subjectPhysical vulnerabilityen_US
dc.titleWhat controls physical vulnerability to geo-hydrological hazards?: a contribution to quantitative assessment of landslide and flood risk in western Ugandaen_US
dc.typeOtheren_US

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