Investigation of storm variability using the Gordji method (case study: Mazandaran province)

Document Type : Research Article

Authors

• Saina Vakili Azar ¹
• Yagob Dinpashoh ²
• said jahanbakhsh ³

¹ Dept. of Water Eng., University of Tabriz

² Dept. of Water Engineering, University of Tabriz

³ Dept. of Climatology, University of Tabriz

10.22067/geoeh.2024.89692.1518

Abstract

The study of different rainfall patterns in different stations is crucial from the view of the hydrologic process. In the present study, by using the 564 storms recorded in three rain gauge stations namely, Sari, Abbas Abad, and Firuzjah, the Huff curves were plotted in three rainfall classes which are, i) less than 6 hrs, ii) 6-12 hrs, and iii) more than 12 hrs. According to the 50% Huff curves, the storms were analyzed using the quartile approach. Then, the design storm hyetographs were plotted for the selected stations in different rainfall classes. Next, to investigate the variability of the storms, a new method was used based on the vertical distances obtained between the Huff curves of 80 and 20 percent (V) and also the values of 50% Huff curve (d50) in three different percent of time, (25,50 and 75). Results showed that types of the most of storms in different rainfall classes were in the second quartile. Also, the results indicated that in most of the classes, a significant percentage of precipitation (more than 80%) falls until the seventh decile of the duration. By moving towards the last deciles, the percentage of rainfall decreased. According to the results, it was found that the highest variability of storms in the rainfall classes of less than 6 hrs, 6-12, and more than 12 hours are related to stations Sari, Abbas Abad, and Firuzjah, respectively. It seems that the results of this study will be helpful in the scientific management of water resources and on-time warning of floods in the region.

Keywords

• Storm
• Rainfall temporal distribution
• Huff curve
• Hyetograph
• Mazandaran province

Main Subjects

• Climatic and atmospheric hazards

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