Determining the Flood Hazard Level of Mazandaran Sub-Basins Using a GIS-based Distributed Method

Document Type : Research Article

Authors

1 Water Engineering Dept, IKIU University

2 Water Engineering Dept., IKIU University, Qazvin, Iran

3 Assistant Professor, Imam Khomeini International University

Abstract

The most important step for prevention of flood’s destructive effects is determining the flood-prone areas over the catchment. There are several approaches for flood prioritization and flood hazard mapping when it comes to flood subject, but the distributed and GIS-based methods are one of the best ones and widely used. Most of the studies that have carried out on this topic were based on analytical hierarchy process (AHP) or fuzzy analytical hierarchy process (FAHP) for estimating the weight of factors affecting the formation of the flood. These methods depend on experts comments and owing to their unfamiliarity with all factors that affect the flood formation, it maybe leads to significant biases in the final results and unreasonable analyses. On this basis, a new method which considers the interaction between the effective factors is used in this study. Finally, by using a linear combination the flood hazard map is created for the study area and divided into five classes including very high, high, moderate, low and very low. Verification of this approach by using recorded destructive floods at different hydrometric stations indicates that the performance of this method, especially on
identifying areas with very high and high hazard levels, is very remarkable. For example, the results of distributed approach in Shirgah-Talar, Razan-Noor, SoleimanTange, Ghoran-Talar and Doab-Challos hydrometric stations are completely matched with recorded historical floods that most of them have the return periods higher than 50-year and 100-year. One of the great advantages of this approach is that it can predict and determine the spatial pattern of flood-prone areas which is more important especially for local authorities and persons who are in areas with high danger of floods. After identifying the flood-hazard areas, the local authorities can set preventive measures for reducing flood
damages, design evacuation plans and run campaigns such as posters and maps to inform the residents about the hazardous areas.

Keywords


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  • Receive Date: 11 November 2018
  • Revise Date: 18 January 2019
  • Accept Date: 23 January 2019
  • First Publish Date: 21 March 2019