Journal of Advanced Informatics in Water, Soil, and Structure

Journal of Advanced Informatics in Water, Soil, and Structure

Investigating Changes in River Flow and Concentration of Precipitation in Dez Reservoir Basin

Document Type : Research Article

Authors
Mohammad Hossein Dasht Bozorgi 1
Fereydoon Radmanesh 1
Farshad Ahmadi 1
Mohammad Nazeri Tahroudi 2
1 Department of Hydrology and Water Resources, Shahid Chamran University, Ahvaz, Iran
2 Department of Water Engineering, Lorestan University, Khorramabad, Iran
10.22048/wss.2024.424171.1001
Abstract
In this study, in order to investigate the trend of changes in precipitation and river flow in Dez basin, were used the river flow (1963-2019) and precipitation (1971-2019) values of stations in Dez reservoir basin in two monthly and annual scales. The distribution of precipitation pattern in the region was also investigated using precipitation concentration index (PCI) and for evaluation the trend of changes in studied values the modified Mann-Kendall test were used. The results of the trend of precipitation changes in the study area showed the decreasing trend of precipitation in all studied stations that due to the slope of the trend line, most of the decrease in precipitation in the studied stations occurred in March. These changes are evident on a monthly and annual scale. Decreasing changes in precipitation in the study area have started since 1991. Decreasing changes in precipitation have a direct effect on flow rate and have caused decreasing changes in flow rate in Tele Zang, Sepid Dasht Sezar, Tang Pang Bakhtiari and Tang Pang Sezar stations. On a monthly scale, the decreasing changes were more significant in the first half of the year (April to October) and March. According to the time of change point in the flow rate time series in the studied stations, it is possible to reduce the flow rate changes in Tele Zang, Sepid Dasht Sezar, Tang Pang Bakhtiari and Tang Pang Sezar stations are about 34, 23, 15 and 43% respectively.
Keywords
Extreme values
Precipitation Concentration
Precipitation Pattern
Trend

Subjects

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  • Receive Date 06 November 2023
  • Revise Date 20 November 2023
  • Accept Date 26 November 2023
  • First Publish Date 30 December 2024
  • Publish Date 01 January 2025