Investigation of drought characteristics in north-west of Iran using Deciles Index

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SALEHPOUR JAM AMIN; TABATABAEI MAHMOUDREZA; SARRESHTEHDARI AMIR; MOSAFFAIE JAMAL

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Journal: WATERSHED ENGINEERING AND MANAGEMENT Year:2019 | Volume:10 | Issue:4 Page(s): 552-563

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Title

Investigation of drought characteristics in north-west of Iran using Deciles Index

Author(s)

SALEHPOUR JAM AMIN | TABATABAEI MAHMOUDREZA | SARRESHTEHDARI AMIR | MOSAFFAIE JAMAL | Issue Writer Certificate

Keywords

Box-Cox transformationQ1

IntensityQ1

duration and frequencyQ1

Mann-KendallQ2

Normal distributed precipitationQ1

Synoptic stationQ1

Abstract

Investigation of drought event has a great importance in the natural resources management and planning water resources management. In this research, the drought characteristics in the selected Synoptic stations in northwest of Iran, including Ardebil, Khoy, Oroomieh, Tabriz, Zanjan, Sanandaj and Saghez were investigated using the Deciles Index. First, after rebuilding monthly missing data in the period of 1977-2014, time series of precipitation in each station normalized using Box-Cox transformation. Then, the Deciles Index in different time scales of monthly, seasonal and yearly was calculated based on the normalized monthly precipitation of stations in the period of 1977-2014 by MATLAB and DIP software. Then, the drought characteristics, including Intensity, duration and frequency were calculated in each Synoptic station. In this research, to find the trend of precipitation in the 38 years, 1977-2014, First, trends of the selected stations were determined using Mann-Kendall trend test at the different time scales of the 19 year period, 1977-1995, then compared with trend of the 38 years and finally, determined the changes of the mean precipitation values in two subsequent periods, 1977-1995 and 1996-2014. Obtained results show that the mean annual precipitation at the all stations was decreased in the second period than base period. The results also show that the drought occurrence with different Intensity, duration and frequency occurred in selected Synoptic stations in northwest of Iran. The results also indicate that there is the decreasing trend of precipitation at the Synoptic stations of Saghez and Sanandaj in yearly time scales. Although the stations of Saghez and Zanjan have no trend in the period of 1977-1995, they have decreasing and increasing trends in some time scales in the period of 1977-2014.

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APA: Copy

SALEHPOUR JAM, AMIN, TABATABAEI, MAHMOUDREZA, SARRESHTEHDARI, AMIR, & MOSAFFAIE, JAMAL. (2019). Investigation of drought characteristics in north-west of Iran using Deciles Index. WATERSHED ENGINEERING AND MANAGEMENT, 10(4 ), 552-563. SID. https://sid.ir/paper/234601/en

Vancouver: Copy

SALEHPOUR JAM AMIN, TABATABAEI MAHMOUDREZA, SARRESHTEHDARI AMIR, MOSAFFAIE JAMAL. Investigation of drought characteristics in north-west of Iran using Deciles Index. WATERSHED ENGINEERING AND MANAGEMENT[Internet]. 2019;10(4 ):552-563. Available from: https://sid.ir/paper/234601/en

IEEE: Copy

AMIN SALEHPOUR JAM, MAHMOUDREZA TABATABAEI, AMIR SARRESHTEHDARI, and JAMAL MOSAFFAIE, “Investigation of drought characteristics in north-west of Iran using Deciles Index,” WATERSHED ENGINEERING AND MANAGEMENT, vol. 10, no. 4 , pp. 552–563, 2019, [Online]. Available: https://sid.ir/paper/234601/en

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