Document Type : Research Paper

Authors

1 International Desert Research Center, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

2 Department of Physical Geography, Faculty of Geography, University of Tehran, Tehran, Iran

3 Vice-Chancellor for Research and Technology, University of Tehran, Tehran, Iran

4 International Desert Research Center, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. Crisis Management Directorate, Alborz Governorate, Karaj, Iran.

10.22059/jrwm.2024.371670.1745

Abstract

Hydrological drought is used to show the reduction of surface flows and the drop in the level of underground water reservoirs, lakes, and rivers. The present research was carried out to determine the basic flow index values and to check its efficiency in determining the type of flow regime and regional analysis of hydrological drought in the Halil-Rood watershed. For this purpose, three homogeneous hydrological drought zones were determined based on the threshold level and cluster analysis, and then the base flow index was calculated on a daily scale using the daily discharge data in 10 hydrometric stations in the homogeneous zones. The results showed that the regional average of the annual base flow index is 0.38 with a standard deviation of 0.193 in the long-term statistical period and the range of the base flow index is 0.12-0.29. Based on the 70th, 80th, and 90th percentiles, the river flow regime was divided into four classes, and it was found that 100% of the watershed sub-basins of the study area had an unstable regime. Also, the results of drought zoning showed that hydrological drought occurred at the threshold level of 70 in the southeast of the region in the area of the Dehroud hydrometric station and in the levels of 80 and 90 in the northwest of the region in the area of Baft and Cheshme-Arus stations. The results of the present research can be used in the assessment of underground water supply, water supply systems, irrigation management, hydrological drought monitoring, and regional models in the estimation of water resource reserves in areas without statistics.

Keywords

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