Geographical planning of space quarterly journal

Geographical planning of space quarterly journal

Analysis and zoning of urban vulnerability against natural hazards The Case study of Ilam city

Document Type : Article extracted From phd dissertation

Authors
Department of Geography and Urban Planning,Malayer Branch, Islamic Azad University, Malayer, Iran
Abstract
Due to the increasing incidence of floods, particularly in urban areas, and their associated risks to life, finance, and the environment, zoning flood-prone locations is of utmost importance. Therefore, current descriptive-analytical research aims to identify effective variables in flood risk zoning and assess the vulnerability of Ilam City to flood risk. The study identified factors affecting flood vulnerability zoning based on 11 variables sourced from different studies. The AHP method was then used to assess the opinions of 73 experts and weight experts, in relation to each variable, through the Export Choice software. Finally, the FAHP method was employed alongside GIS software to generate maps showing Ilam city's flood risk vulnerability zoning. When zoning Ilam city's vulnerability to floods, we examined 11 variables. Of these, three variables stand out: distance from waterways, with a weight of 0.244; distance from the river, with a weight of 0.126; and slope direction, with a weight of 1.102. These variables play a key role in determining the vulnerability of Ilam city to floods. A significant portion of Ilam city, spanning 1687 hectares, exhibits a high susceptibility to flood hazards due to its unique topographic and geologic features. The analysis of flood risk zoning in Ilam city indicates that the northwest, west, southwest, and south regions experience a lower level of vulnerability than other parts of the city. Conversely, a significant portion of the central, eastern, and northeastern regions of Ilam are vulnerable to such risks. In the following, suggestions have been made to reduce the vulnerability of Ilam city to floods.
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