Flood Potential Assessment in the Kuzet-Topraqi Watershed Sub-basins Using the Extended Flash Flood Model

Madadi, Aghil; Pasban, Amirhesam; Nezafat Taklhe, Behrouz

Flood Potential Assessment in the Kuzet-Topraqi Watershed Sub-basins Using the Extended Flash Flood Model

Document Type : Extract article from research project

Authors

Aghil Madadi ¹

Amirhesam Pasban ²

Behrouz Nezafat Taklhe ³

¹ 1 Professor of Geomorphology, Department of Natural Geography, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran.

² Phd student of geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran. a.hesam773@gmail.com

³ Phd student of geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili. Ardabil, Iran

Abstract

Background and Objective: In recent years, with the increase in the frequency and intensity of flash floods, zoning the risk of this phenomenon has become essential. The Extended Flash Flood Model (MFFPI) is one of the modern and effective methods for assessing and zoning flash flood risk in watersheds. The aim of this study is to assess the flood potential in the Kuzet-Topraqi Watershed Sub-basins using the Extended Flash Flood Model.
Methodology: In this regard, first, information layers including slope, flow accumulation, land use, rock permeability, slope curvature, and soil texture were extracted in the GIS environment using base maps, and in the next step, all these parameters were weighted and weighted maps were produced using the Raster Calculator tool. Then, by overlapping these layers, the flash flood potential map for the Kozeh-Toparqi watershed was divided and extracted into five risk categories: very low (55 km2), low (126.10 km2), medium (266.15 km2), high (219.50 km2), and very high (138.03 km2).
Results and Findings: The results show that the northern and central parts of the basin are mainly in the low to medium risk range, while the southern and western areas experience the highest flood risk. The distribution pattern of these areas can be affected by geomorphological parameters such as slope, elevation, and drainage density, as well as hydrological and land use characteristics. In particular, areas with steep slopes, low permeability, and runoff-sensitive land uses are susceptible to flash floods. On the other hand, low-slope areas, which are mainly located in the middle areas, can become critical points in the development of floods due to the accumulation of incoming runoff from upstream areas. The results also showed that sub-basins 2 and 3 with areas of 0.02 and 0.15 km2, and in contrast, sub-basins 14 and 17 with areas of 29.27 and 14.98 km2, are located in very low and very high flood risk zones, respectively.
Conclusion: As a result, flood management in this basin requires adopting solutions appropriate to the topographic conditions. In steep areas, implementing watershed management operations such as constructing sedimentation dams and developing vegetation cover can help reduce runoff velocity and increase permeability. Also, in low-slope areas, creating flood control reservoirs and appropriate drainage can play an effective role in reducing flood risks.

Keywords

MFFPI

vegetation cover

land use

Kuzhet-e-Toprak sub-basin

Subjects

Physical geogeaphy

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