Document Type : Original Article


1 M.Sc. Graduate, Dept. of Natural Resource. University of Sari, Iran

2 Associate Professor of Department of Watershed Management, Sari Agricultural Sciences and Natural Resources of University, Sari, Iran

3 Assistant professor of Department of Watershed Management, Sari Agricultural Sciences and Natural Resources of University, Sari, Iran

4 Professor of Department of Watershed Management, Sari Agricultural Sciences and Natural Resources of University, Sari, Iran



Climatic parameters in time and space scales of change are for many reasons of Changes and how they should be based on observations using a statistical method to be determined. Analysis of the most widely used statistical methods that assess potential climate change on hydrological time series, such series of precipitation, temperature and flow rate used. This study of 11 synoptic,rain gage and climatology stations with 30 years during the years 1979 to 2009 period is Charmahal o Bakhtiari province.Mann-Kendall non-parametric and  sen estimate tests were used for the purpose of the study.The results showed that 11 stations were the only station in sepid dasht 95 and 99 percent had significant levels decline and changes in the slope is negative and other gage stations does not have significant trends. The results of this study can be in the long-term planning for water resources management, irrigation scheduling and prediction of future droughts in the province can be used


Becker, S., Gemmer, M., Jiang, T., 2006. Spatiotemporal analysis of precipitation trends in the Yangtze River catchment. Stochastic Environmental Research and Risk Assessment, 20: 435–444.
Belle, V.G., Hughes, J.P., 1984. Nonparametric tests for trend in water quality. Water Resources Research, 20 (1): 127–136.
Birsan, M.V., Molnar, P., Burlando, P., Pfaundler, M., 2005. Streamflow trends in Switzerland. Journal of Hydrology, 314: 312–329.
Brooks, C.E.P., and Carrthers, N., 1982. Handbook of Statistical Method in Meteorology, London, H.M.S.O, pp 412.
Burn, D.H., Hag Elnur, M.A., 2002. Detection of hydrologic trends and variability. Journal of Hydrology, 255: 107– 122.
Carbajal, L.R., Pellicciotti, F.,Molnar,P., 1993. Analysis of Hydro-climatic Trends in the Aconcagua river basin, central Chile. Institute of Environmental Engineering, Ethz Zurich, CH-8093, Switzerland.
Fischer, Thomas., Marco Gemmer, Liu Lüliu, Su Buda. (2010). Temperature and precipitation trends and dryness/wetness pattern in the Zhujiang River Basin, South China, 1961-2007. Quaternary International xxx: 1- 11.
Heejun, C., Won, J., 2010. Spatial and temporal changes in runoff caused by climate change in a complex large river basin in Oregon. Journal of Hydrology, 388 :186–207.
Hejam, S., khoshkho, Y., shamsodinvandi, R., 2008. analaysis of annual and
Seasonal precipitations trend in the central iran basin using nonparametric methods. journal of geoghraphycal researchs,vol.64. Summer,157-168pp(in Persian).
10. Huntington, T.G., 2006. Evidence for intensification of the global water cycle: review and synthesis. Journal of Hydrology, 319: 1–4.
Jiang, Y., Zhou, C., Cheng, W., 2007. Streamflow trends and hydrological response to climatic change in Tarim headwater basin. Journal of Geographical Sciences, 7(1): 51–61.
Kahya, E., Kalayci, S., 2004. Trend analysis of streamflow in Turkey. Journal of Hydrology, 289: 128–144.
Kampata, J.M., Parida, B.P. and Moalafhi, D.B., 2008. Trend analysis of rainfall in the headstreams of the Zambezi River Basin in Zambia. Physics and Chemistry of the Earth, 33: 621–625.
Khaled Hamed. H., 2008. Trend detection in hydrologic data: The Mann–Kendall trend test under the scaling Hypothesis. Journal of Hydrology, 349: 350– 363.
Khaliq, M.N., Ouarda. T.B.M.J., Gachon, P., Sushama, L., StHilaire, A., 2009. Identification of hydrological trends in the presence of serial and cross correlations: A review of selected methods and their application to annual flow
regimes of Canadian rivers. Journal of Hydrology, 368 :117–130.
Kundzewicz, Z.W., Mata, L.J., Arnell, N.W., Doll, P., Kabat, P., Jimenez, B., Miller, K.A.,Oki, T., Se˛n, Z., Shiklomanov, I.A., 2007. Freshwater resources and their management.
In: Parry, M.L., Canziani, O.F., Palutikof, J.P., van der Linden, P.J., Hanson, C.E. (Eds.), Climate Change 2007: Impacts, Adaptation and Vulnerability, Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK, pp. 173–210.
Kundzewicz, Z.W., Robson, A., 2004. Change detection in hydrological records – a review of the methodology. Hydrological Sciences Journal, 49: 7–20.
Lettenmaier, D,P., Wood, E,F., Wallis, J,R., 1994. Hydroclimatological trends in the continental United States, 1948–1988. Journal of Climate, 7: 586–607.
Sohrabi, M.M., Marofi, S., sabziparvar, A., Maryanaji, Z., 2009. Investigation of existence of trend in annual precipitation of Hamedan province using mann-kendall method. journal of water and soil conservation, 16(3): 163-169, (in Persian).
Westmacott, J.R., Burn, D.H., 1997. Climate change effects on the hydrologic regime within the Churchill–Nelson river Basin. Journal of Hydrology, 202 (1–4): 263–279.
Xu, Z.X., Li, J.Y., Liu, C.M., 2007. Long-term trend analysis for major climate variable in the Yellow River basin. Hydrological Processes, 21: 1935–1948.
Zdenek, K. and Milada, M., 2008. Long-term Trends of Rainfall and Runoff Regime in Upper Otava River Basin. Soil & Water Research, 3 (3): 155–167.
Zongxue, X., Zhaofei, L., Guobin, F., Yaning, C., 2010. Trends of major hydroclimatic variables in the Tarim River basin during the past 50 years. Journal of Arid Environments, 74: 256–267.