Evaluation of the fractal dimension flood hydrograph and WinTR-55, NRCS, HEC-HMS models of the Malayer Kalan Dam Basin

Articles in Press

Document Type : Original Article

Authors

1 faculty of Natural resourcesandenvironment, MalayerUniversity,Malayer Iran

2 Professor of Natural Engineering Department, Faculty of Natural Resources and Environment, Malayer University, Malayer, Iran

3 Faculty of Natural Resources and Environment, Malayer University, Iran.

Abstract

One of the methods for estimating floods in these basins is to use hydrological modeling.The purpose of this study is to analyze the maximum flood discharge using fractal dimensionandWinTR-55, NRCS, and HEC-HMS models in some sub-basins of the Malayer Dam inHamedan usinggeomorphological data.The study shows that in the Acsub-basin there is an acceptable agreement between the NRCS unithydrographs and the fractal dimensionunit, and the HEC-HMS model output also indicates that there is anacceptable agreement between the observational data and the modeloutput in the Ac sub-basin, which is observed in the fractal dimension and the HEC-HMS output as a single NRCS hydrograph. The results of calculating peak discharge using theGeomorphological Unit Hydrograph method, despite the small size and small changes in the basin's geomorphological parameters, show that the peak discharge values estimated in the GIUH method differ little from the observed and calculated discharges using the WinTR-55 model, which means that geomorphological parameters play an important and effective role in estimating peak discharge. Studies have shown that the hydrographs of the WinTR-55 model provide acceptable measurements of observational data in return periods of less than 5 years, and as the return periodincreases, the accuracy of the model decreases. In addition, the model is more sensitive to the values of the CNcurve number, indicating that the model provides acceptable results for sub-basins and isnot suitable for larger basins. Therefore, it is suggested that for small basins, the winTR-55 model and the fractal dimension with higher and more accurate drainage density be used.

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Journal of Hydrogeomorphology

Articles in Press, Accepted Manuscript
Available Online from 28 September 2025

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History

  • Receive Date: 26 July 2025
  • Revise Date: 28 September 2025
  • Accept Date: 28 September 2025

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