Vulnerability Assessment in Urban Areas against Flood with Fuzzy Logic (case study: Tehran District 22)

Subject Areas : environmental management

Elham  Esmaeili Alavijeh ¹ (Ph.D Student in Environmental Planning, University of Tehran .*(Corresponding Author))
Saeid  Karimi ² (Assistant professor of faculty of Environment, University of Tehran)
Fatemehsadat  Alavipoor ³ (Ph.D Student in Environmental Planning, University of Tehran.)

Received: 2015-08-03 Accepted : 2016-04-23 Published : 2020-05-21

Keywords: vulnerability, flood, Tehran District 22, Fuzzy Logic,

Abstract :

Background and Objective: In general, in recent decades, due to urban lives on the sidelines of rivers, dwellers of these areas have been the subject of damages caused by flood. The goal of this research is determining the vulnerability level of urban areas against flood in order to reducing human and financial losses. Method: For this purpose, Chung fuzzy analysis hierarchical process method (fuzzy AHP) is used due to the higher degree of possibility for weighting criteria of gradient, soil, distance from river, geology, height, land usage, and population. After weighting, the criteria of vulnerability in the environment ARCGIS were fuzzy and ultimately fuzzy operators were used for overlapping layers. Findings: To amend the obtained maps, algebraic multiplication and algebraic addition operators, Gamma 0.9, Gamma 0.7 and Gamma 0.5 operators were used. Obtained map from Gamma 0.7 operator was chosen as the final map of vulnerability for obtaining more appropriate result. Discussion and Conclusion: Therefore, considering the final map, and that the percentage of population density is over 1.07 in the eastern north of the area near Kan river, the possibility of vulnerability is proposed to be high in that area. Also it is possible that unpermitted constructions in Kan and Vardavard River limits will lead to water aggregation and its sudden release in the area, and if the process of unpermitted constructions and population increase is continued in the area, it can be resulted that the possibility of vulnerability against flood may be high in Tehran District 22.

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