Vulnerability Analysis of Flood in Rangelands Using Multi Criteria Decision Analysis and Geographic Information System (Case Study: Gilard Basin, Damavand, Iran(

Document Type: Research and Full Length Article

Authors

1 ITVHE Academic Member, Ph.D. Student in Combat Desertification, Semnan University

2 Postgraduate M.Sc. in Geophysics, Islamic Azad University, Tehran Branch

Abstract

Flood disaster is considered as a major natural hazard due to its devastating
effects on the affected areas. Determining the flood vulnerable areas is important for
decision makers in order to perform planning and management activities. Geographical
Information System (GIS) is integrated with Multi Criteria Decision Analysis (MCDA)
used to analyze the flood vulnerable areas. The aim of this research was to provide more
flexible and accurate decisions to evaluate the causative factors for planning and
management of rangelands of Gilard, Damavand. So, effective factors influencing flood
occurrence in the study area was first surveyed. Some of the causative factors for flood in
the watershed such as mean annual precipitation, basin area, basin slope, drainage density,
land uses and soil type were taken into account. Then, through assembling spatial and
descriptive information related to the study area and using Analytic Hierarchy Process
(AHP), the criteria have been grouped and weighted. At the end, as regards of ultimate
weight, the basin was classified into five classes. Results of this research show that mean
annual precipitation and Sedimentation Rate with the average values of 26.5% and 2.01%
had maximum and minimum effects on flood occurrence in rangeland of Gilard in
Damavand, respectively.

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