Flood Vulnerability Assessment in Tehran City (Iran) (PAP014309)

Código

PAP014309

Autores

Manijeh Ghahroudi Tali, A. Afshari, Soheil Ghyasvand, P. Sahebalzamani, M.A. Nezammahalleh

Tema

Flood risk management in mega cities

Resumo

Vulnerability assessment of urban areas against flooding, as a complicated hazard, in Tehran City has been conducted in this research. The flooding has temporal and spatial variability and also increasing trend with enormous financial and life damages. Occurrence of the flood hazard is greatly dependent upon natural conditions, characteristics of urban areas, and also the culture of society. The objective of this research is to find a pattern for the differences of the vulnerability in the urban areas. Variables of old texture blocks, population concentration, land use, and distance to bridges as physical agents and variables of slope and drainage network density as intensifying agents have been included for the analysis. The variables have been prioritized and the relations between these and the vulnerability determined by Analytical Hierarchy Process (AHP). The agents of population concentration and drainage network density have been revealed to have the highest and the lowest weights, respectively. The results have indicated that the regions of 10, 17, 8, and 11 are the most vulnerable and the regions of 22, 21, 18, and 5 are the least vulnerable. The vulnerability map indicates that 138 square kilometers of Tehran area is categorized as very high and high vulnerable. Based on the results from zonal statistic, regions of 10 and 22 have the highest and the lowest vulnerability, respectively. Greatly vulnerable areas are coincident with highly populated regions of old textures.