The suitable method for rainfall hyetograph extracting in dry areas via hourly rainfall and under the climate change scenarios

Document Type : Research Article

Authors

1 Professor, Department of Nature Engineering, Faculty of Natural Resources and Geoscience, University of Kashan, Kashan, Iran

2 M.S. student,, Department of Nature Engineering, Faculty of Natural Resources and Earth Sciences, University of Kashan, Kashan, Esfahan, Iran

Abstract

Objective: In this research, triangular (Yen and Chao) and periodic block methods were used to calculate and draw precipitation hyetograph in Kashan synoptic station as an indicator station of dry areas.
Method: In order to investigate the effect of climate change on precipitation in the study area, the general circulation model of the atmosphere and different climate scenarios were used. Then the frequency intensity curves for the base period (1993-2017) and the Znear future (2030-2011) and distant future (2050-2031) periods were drawn by using Kahraman-Abkhader relationship. In the following, the curves of intensity, duration, frequency of extraction and corresponding rainfall hyetograph were drawn based on triangular (Yen and Chau) and periodic block methods, and the results were compared with the rainfall patterns measured at the Kashan synoptic station.
Results: The results showed that in the study area, the maximum amount of precipitation occurred within 30 minutes after the beginning of the precipitation. The results showed that the precipitation hyetograph of the measured and predicted precipitation data is similar to the hyetograph drawn by the triangulation method (Yen and Chau).
Conclusions: According to the results, the triangular method (Yen and Chau) can be introduced as a suitable method for investigating the distribution of precipitation in dry areas.

Keywords

Main Subjects

References

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Iranian journal of Ecohydrology
Volume 11, Issue 3
October 2024
Pages 355-373

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History

  • Receive Date: 23 July 2024
  • Revise Date: 18 August 2024
  • Accept Date: 27 August 2024
  • First Publish Date: 22 September 2024
  • Publish Date: 22 September 2024

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