Investigating Changes of Land Use and Hydroclimatic Extreme Indices in Minab River Basin

Document Type : Research

Authors

1 Ph.D. Graduated, Department of Natural Resources Engineering, Faculty of Agricultural Science and Natural Resources, University of Hormozgan, Bandar Abbas, Iran

2 Professor, Department of Natural Resources Engineering, Faculty of Agricultural Science and Natural Resources, University of Hormozgan, Bandar Abbas, Iran

10.22092/wmrj.2023.362493.1543

Abstract

Introduction and Goal
In the last three decades, land use in the Minab river basin has undergone significant changes and these changes along with climate change in the basin can affect the trend of hydroclimatic variables. Due to the changes that have occurred in the climate and land use of the Minab River Basin in the past decades until now, the investigation of trends and changes in the threshold indicators of precipitation, temperature and flow rate becomes particularly important. Therefore, the aim of the current research is to investigate the trend of land use changes and hydroclimatic variables in the Minab basin.
Materials and Methods
In the current research, the data of hydrometric, rain gauge and evapotranspiration stations in the Minab watershed were analyzed to extract threshold indices based on the ETCCDI standard including precipitation, temperature and river flow. Trend analysis was done using a non-parametric Mann-Kendall test. Also, land use changes were extracted using TM series Landsat satellite images in 1989, 2004, and 2020 from TM, ETM+, and OLI sensors, respectively, and the accuracy of the extracted images was confirmed with Kappa statistics.
Results and Discussion
The finding showed that all the temperature limit indices, including tropical nights, hot days, hot nights and the range of day and night temperature, have an increasing trend. The extreme precipitation indices, heavy precipitation of 10, 20, and 30 mm in some stations has an increasing trend, but the annual average precipitation has an increasing trend. The number of wet days is decreasing and the number of dry days is increasing. The investigation of the changes in the rainfall regime of the region showed that the intensity of the rainfall is increasing in the duration of 15 and 45 minutes. According to the changes that have occurred, the change in the precipitation situation in the region is inevitable. The survey of land use changes over the past three decades showed that 22% of the pasture land area has decreased, and residential and agricultural land has increased by 280 and 220%, respectively.
Conclusion and Suggestion
The findings of this research showed that despite the increase in the average annual rainfall (16 mm per year), and other rainfall indicators that had no significant trend, the trend of 15 and 45 minute rainfall intensity was increasing and significant. Contrary to the trend of precipitation, which cannot be proven with great certainty, the increasing trend of all temperature indices (on average 0.9°C per year) confirmed the climatic changes in the Minab watershed. On the other hand, the trend of minimum and maximum stream flow and maximum discharge was also increasing in the watershed, and it can be one of the reasons for the changes in rainfall, construction of dams, and changes in land use from pasture and war lands to agriculture and residential. Based on the results of this research, it is suggested to investigate the effect of future climate changes on meteorological and hydrological variables and use its findings in natural resources management.

Keywords

Main Subjects

References

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History

  • Receive Date: 19 June 2023
  • Revise Date: 28 July 2023
  • Accept Date: 21 September 2023

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