Trend Analysis of Annual Dry Periods Using SPI and AMDSL and ANDSPs Indices | ||
| دانش آب و خاک | ||
| Article 10, Volume 29, Issue 4, February 2020, Pages 121-133 PDF (638.67 K) | ||
| Authors | ||
| Sahar Babaei hessar* 1; Reza Ghazavi2; Maryam Hossein khah3 | ||
| 1student of kashan university | ||
| 2Associate Professor | ||
| 3Urmia university | ||
| Abstract | ||
| < p >Abstract Study of the trend and change of precipitation is very important in the proper management of water resources. In this research, in order to analyze the changes in precipitation and annual dry spell period, the trends of SPI and two Annual Maximum Dry Spell length and Annual Number of Dry Spell Periods indices are studied. For this purpose, daily precipitation data in five synoptic station of northwest of Iran (Urmia, Tabriz, Ardebile, Khoy and Maragheh) which has a 30-year data (2010-1981), are used. After examining the homogeneity and normality of the data, significant autocorrelation in each series were tested According to Mann-Kendall test, all three indices have a decreasing trend in most stations. Decreasing trend in two AMDSL and ANDSPs indices reflects the improving climatic condition 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 two SPI, and ANDSP indices is significant in Maragheh and Mann-Kendall (p < 0.05). Test criteria (Zm) for SPI, and ANDSP indices are -3.622 and -2.408 respectively. In order to identify the start points of trends of series, sequential Mann-Kendall techniques have been used. The results indicate the occurrence of significant mutations in Maragheh station. | ||
| Keywords | ||
| AMDSL; ANDSP; Mann-Kendall Test; SPI; Trend Analysis | ||
| References | ||
|
Ahmadi H, Fallahghalhary Gh and Shaemi A, 2016. Estimating and evaluating the trends of annual reference evapotranspiration based on influential climatic parameters in the north east of Iran. Water and Soil Science- University of Tabriz 25: 257-269. (In Persian with English abstract).
Ahmadi F, Radmanesh F and Mirabbasi Najaf Abadi R, 2015. Trend analysis of the average temperature in southern half of Iran during the recent four decades. Water and Soil Science- University of Tabriz 25: 225-211. (In Persian with English abstract).
Ahmadi F, Radmanesh F and Mirabbasi Najaf Abadi R, 2016. Trend analysis of precipitation in northern Half of Iran during the recent Half of the century. Water and Soil Science- University of Tabriz 26:207-224. (In Persian with English abstract).
Bartlett M.S, 1937. Properties of sufficiency and statistical tests. Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences 268-282.
Becker S, Gemmer M and Jiang T, 2006. Spatiotemporal analysis of precipitation trends in the Yangtze River Catchment. Stoch Environ Res Risk Assess 20: 435–444.
Buishvand T.A, 1982. Some methods for testing the homogeneity of rainfall records. Journal of Hydrology 58: 11–27.
Bradley J. V, 1968. Distribution-free statistical tests. Practice-Hall, London.
Caloiero T, Coscarelli R, Ferrari E and Mancini M, 2009. Trend detection of annual and seasonal rainfall in Calabria (Southern Italy). International Journal of Climatology 31: 44–56.
Erfanian M and Babaei Hessar S, 2016. Trend analysis of reference evapotranspiration (ET0) and precipitation at some synoptic stations of the Lake Urmia basin. Iran Water Research 10: 143-152. (In Persian with English abstract).
Feidas H, Noulopoulou Ch, Makrogiannis T and Bora-Senta E, 2007. Trend analysis of precipitation time series in Greece and their relationship with circulation using surface and satellite data: 1955–2001. Theoretical and Applied Climatology 87: 155–177.
Ghanbarlou Z, 2012. Analysis of the trend and prediction of rainfall and discharge of Lake Urmia watershed using wavelet theory. Master Thesis, Faculty of Natural Resources, Urmia University. 89 P. (In Persian with English abstract).
Heydari A and Asadi A, 2011. Analysis of temperature and precipitation changes of Shiraz during the period of 1951-2005. Geography and Environmental Planning 22: 137-152. (In Persian with English abstract).
Hosseinzadeh talaee P, Tabari H and Marofi S, 2009. Comparison of parametric and nonparametric methods in studying the monthly, seasonal and annual trends in precipitation and discharge of Gamasiab Basin. Eighth International Conference of River Engineering. University of Shahid Chamran, Ahvaz.
Isazadeh M, Kaki M and Fakherifard A, 2016. Analysis of rainfall trend and evaluation of weather droughts of Iran using the Herbst Method. Water and Soil Science- University of Tabriz 26: 121-143. (In Persian with English abstract).
Kendall M.G, 1975. Rank Correlation Methods, Charles Griffin, London.
McKee T.B, Doesken N.J and Kleist J, 1993. The relationship of drought frequency and duration to time scales. In Proceedings of the 8th Conference on Applied Climatology 22: 179-183.
Mann H.B, 1945. Nonparametric tests against trend. Journal of the Econometric Society 77:245-259.
Mohammadi B, 2011. Analysis of annual rainfall of Iran. Geography and Environmental Planning 22: 95-106. (In Persian with English abstract).
Nasiri M and Modarres R, 2009. Dry spell trend analysis of Isfahan Province, Iran. International Journal of Climatology 29: 1430–1438.
Sabziparvar A.A and Shadmani M, 2011. Trends analysis of reference evapotranspiration rates by using the Mann-Kendall and Spearman tests in arid regions of Iran. Journal of Water and Soil 25:823-834. (In Persian with English abstract).
Schmidli J and Frei C, 2005. Trends of heavy precipitation and wet and dry spells in Switzerland during the 20th century. International Journal of Climatology 25: 753–771.
Sen P.K, 1968. Estimates of the regression coefficient based on Kendall''s tau. Journal of the American Statistical Association 63: 1379-1389.
Sneyers R. 1990. On the statistical analysis of series of observations. World Meteorological Organization, Technical Note 143, Geneva, Switzerland.
Tabari H, Aeini A, Hosseinzadeh Talaee P and Some’e S.H, 2011. Spatial distribution and temporal variation of reference evapotranspiration in arid and semi-arid regions of Iran. Hydrological Processes 26: 500-512.
Tabari H and Aghajanloo M.B, 2012. Temporal pattern of aridity index in Iran with considering precipitation and evapotranspiration trends. International Journal of Climatology 13(2):396-409.
Theil H, 1950. A rank-invariant method of linear and polynomial regression analysis. Nederlands Akad, Wetensch 53: 386-392.
Von Storch H, 1995. Misuses of Statistical Analysis in Climate Research. Pp 11 –26, In: Storch HV, Navarra A (eds) Analysis of Climate variability. Applications of statistical techniques. Springer, Berlin, Heidelberg.
Wijngaard J.B, Klein Tank A.M.G and Konnen G.P, 2003. Homogeneity of 20th century European daily temperature and precipitation series. International Journal of Climatology 23: 679–692.
Xu Z.X, Takeuchi K and Ishidaira H, 2003. Monitoring trend step changes in precipitation in Japanese Precipitation. Journal of Hydrology 279: 144-150.
Winer B.J, Donald R.B, and Kenneth M.M, 1971. Statistical Principles in Experimental Design 2. New York: McGraw-Hill.
Zeroual A, Assani A.A and Meddi M, 2016. Combined analysis of temperature and rainfall variability as they relate to climate indices in Northern Algeria over the 1972-2013. Hydrology Research. (In press). | ||
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