Drought assessment based on the long-term stability of temperature and precipitation in Ardabil DareRood basin

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FARIDPOUR M.; ZEINALI B.; ASGHARI S.; GHORBANI A.; REZAEI BANAFSHEH M.

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Journal: Journal of Water and Soil Conservation Year:2020 | Volume:26 | Issue:6 Page(s): 31-57

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Title

Drought assessment based on the long-term stability of temperature and precipitation in Ardabil DareRood basin

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DarehRood Ardabil basinQ2

Drought indicesQ1

Linear regressionQ1

LOWESS curveQ1

Potential evapotranspirationQ1

Abstract

Background and Objectives: Drought is one of the most important natural hazards that affect a significant number of people due to extensive damage. Drought is also a phenomenon that directly related to the issue of water scarcity and because of its reversibility, can affect the various aspects of human life and the environment. The drought affects almost all the determinants of the hydrological cycle from the onset of precipitation and then the surface water flow and eventually storage in groundwater. Therefore, in this research, due to the results of the stable process of precipitation and temperature in the Ardabil DareRood basin, SPI Index which relies on precipitation, with the RDI index which combines the parameters of Potential evapotranspiration and precipitation, were compared and evaluated in different time intervals. Materials and Methods: In this study, in order to identify drought and wet periods, monthly precipitation data, Minimum and maximum monthly temperature for seven stations were used during the period of 30 years (1985-2014) in the Ardabil valley northwest of Iran. In order to identify the trend in the precipitation and temperature series in this research Man-Kendall (MK) and Sen's slope (Sen) models were used. Also, to assess the long-term stability of the trend in the time series LOWESS curve (at a significant level of 5%) was used. Also, using Aridity index, four stations in the arid area and three stations in the semi-arid region were established. In order to calculate the RDI index, Potential evapotranspiration values were used. The PET value in the RDI index was obtained using monthly temperature data and Hargreaves method. Finally, SPI and RDI indices were compared in 3, 6, 9 and 12-month scales. Results: The results of the LOWESS curve showed that the annual temperature at all stations follows an incremental scenario. While the precipitation behaves differently and often is decreasing. The results also showed that SPI and RDI indices are very similar in different time scales, and R2 is in most cases greater than 0. 90. The most severe drought observed in the SPI and RDI models of the Ardabil station in 2010-2011 on a 3-month scale, whose values were respectively-3/11 and-3/09. Also, the results showed that the RDI index that extreme and severe wet values it’ s larger than SPI. Eventually, both indices are many similarities with each other but because of RDI's use of PET, it can be used more widely for arid and semi-arid regions of Iran Conclusion: This research, two SPI and RDI indices were used to compare the drought events in the DarehRood Ardabil basin of the northwest of Iran. Due to the dry and semi-arid climate of most regions of Iran, it is very probable that the amount of precipitation is zero in some seasons. Therefore, precipitation-based indices such as SPI may have less efficiency than RDI index, which, in addition to rainfall, uses Potential evapotranspiration (PET) in their formulation. Considering the importance of PET parameter in agriculture and water resources management in Iran, it is necessary to examine the RDI index in other regions of Iran, such as the northwest and mountainous regions of Iran and its results can be compared with other indicators such as the important and highly applicable SPI indicator.

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APA: Copy

FARIDPOUR, M., ZEINALI, B., ASGHARI, S., GHORBANI, A., & REZAEI BANAFSHEH, M.. (2020). Drought assessment based on the long-term stability of temperature and precipitation in Ardabil DareRood basin. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(6 ), 31-57. SID. https://sid.ir/paper/400282/en

Vancouver: Copy

FARIDPOUR M., ZEINALI B., ASGHARI S., GHORBANI A., REZAEI BANAFSHEH M.. Drought assessment based on the long-term stability of temperature and precipitation in Ardabil DareRood basin. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2020;26(6 ):31-57. Available from: https://sid.ir/paper/400282/en

IEEE: Copy

M. FARIDPOUR, B. ZEINALI, S. ASGHARI, A. GHORBANI, and M. REZAEI BANAFSHEH, “Drought assessment based on the long-term stability of temperature and precipitation in Ardabil DareRood basin,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 6 , pp. 31–57, 2020, [Online]. Available: https://sid.ir/paper/400282/en

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