Studying Trends in Annual Dry Periods Using the AMDSL, ANDSPs and SPI Indices

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BABAEI S.; GHAZAVI R.; Hosseinkhah M.

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Journal: WATER AND SOIL SCIENCE (AGRICULTURAL SCIENCE) Year:2020 | Volume:29 | Issue:4 Page(s): 121-133

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Title

Studying Trends in Annual Dry Periods Using the AMDSL, ANDSPs and SPI Indices

Author(s)

BABAEI S. | GHAZAVI R. | Hosseinkhah M. | Issue Writer Certificate

Keywords

AMDSLQ2

ANDSPsQ2

DroughtQ2

Mann-Kendall testQ1

SPIQ1

Trend analysisQ2

Abstract

Study of the changes in precipitation regimes is very important in proper water resources management. In this research, in order to analyze the state of precipitation and annual dry spell periods, the trends of SPI, Annual Maximum Dry Spells length and Annual Number of Dry Spell Periods indices were studied. For this purpose, daily precipitation data of five synoptic stations in northwest of Iran (Urmia, Tabriz, Ardebil, Khoy and Maragheh) having a 34-year data record (1981-2014), were used. After examining the homogeneity and normality of the data, the significance of autocorrelation in each of the time series was tested. According to outcome of Mann-Kendall test, all three indices had a decreasing trend in the most of stations. Decreasing trend in the two AMDSL and ANDSPs indices reflects improvement of spell and number of dry periods, and decreasing trend of SPI index indicates reduction of precipitation. So, we can conclude that deSPIte of the reduction in precipitation in the region, rainfall distribution has improved over the years. Decreasing trend of the two SPI, and ANDSP indices is significant in Maragheh and MannKendall test criteria (Zm) for SPI, and ANDSP indices were-3. 622 and-2. 408 respectively (P<0. 05). In order to identify the change points of the trends of series, sequential Mann-Kendall technique were used. The results indicated the occurrence of significant jump in Maragheh station.

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APA: Copy

BABAEI, S., GHAZAVI, R., & Hosseinkhah, M.. (2020). Studying Trends in Annual Dry Periods Using the AMDSL, ANDSPs and SPI Indices. WATER AND SOIL SCIENCE (AGRICULTURAL SCIENCE), 29(4 ), 121-133. SID. https://sid.ir/paper/411085/en

Vancouver: Copy

BABAEI S., GHAZAVI R., Hosseinkhah M.. Studying Trends in Annual Dry Periods Using the AMDSL, ANDSPs and SPI Indices. WATER AND SOIL SCIENCE (AGRICULTURAL SCIENCE)[Internet]. 2020;29(4 ):121-133. Available from: https://sid.ir/paper/411085/en

IEEE: Copy

S. BABAEI, R. GHAZAVI, and M. Hosseinkhah, “Studying Trends in Annual Dry Periods Using the AMDSL, ANDSPs and SPI Indices,” WATER AND SOIL SCIENCE (AGRICULTURAL SCIENCE), vol. 29, no. 4 , pp. 121–133, 2020, [Online]. Available: https://sid.ir/paper/411085/en

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