The Role of Land Use Changes on Run-off and Flood Properties in the Doab Catchment

Document Type : Research Article

Authors

1 PhD Student in Geomorphology, Mohaghegh Ardabili University, Ardabil

2 Associate Professor, Department of Natural Geography, Mohaghegh Ardabili University, Ardabil

3 Professor, Department of Natural Geography, Mohaghegh Ardabili University, Ardabil

Abstract

Deforestation and pastures, invasion of privacy and riverbanks, flooding of the Doab catchment during recent years, especially the downstream flood of 2019, raise the possibility of impacts of land use changes on flood characteristics.The purpose of this study was to evaluate the impact of land use changes on flooding in Doab catchment using HEC-HMS model. For this purpose, first land use map of Doab catchment was prepared for the years 1995 and 2019. SCS method was used to calculate initial rainfall and basin run-off height and Muskingum method was used for flood routing. In order to investigate the effect of land use changes on flood characteristics, precipitation data and discharge for the year 2019 were implemented in the model created with land use conditions of 1995. Evaluation of land use maps showed reduction of forest area and Pastures area to the 56.71 and 28.25 square kilometers equivalent to 7.39 and 3.68 percentage of total basin area, dryland, irrigated and residential areas respectively 58.30, 19.88, and 6.78 square kilometers increased equivalent to 7.60, 2.59, and 0.89 percent. The results of this comparison showed that the average run-off peak increased by an average of 15.46 percent and the volume of run-off by an average of 19.74 percent. This indicates a decrease in the initial amount of rainfall losses and an increase in run-off. Therefore, it can be said that land use changes in the Doab catchment have increased the peak and volume of run-off and ultimately increased flooding in this basin.

Keywords

References

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Iranian journal of Ecohydrology
Volume 7, Issue 2
July 2020
Pages 331-344

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History

  • Receive Date: 10 January 2020
  • Revise Date: 17 May 2020
  • Accept Date: 17 May 2020
  • First Publish Date: 21 June 2020
  • Publish Date: 21 June 2020

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