Document Type : Research Paper

Authors

1 Assistant Professor

2 Researcher of Soil Conservation & Watershed Management Research Institute (SCWMRI)

3 assistance professor of Imam Higher Education Center

Abstract

Land use and climate change can alter the seasonal and annual discharge of rivers. Annual and seasonal river discharge changes should be considered in the management and planning of water resources in basins. For this propose, Karkheh basin was selected for study. For trend analysis of this basin daily discharge time series in 15 sub-basins during the 1969-2012 period. After reconstruction of time series of selected sub-basin, five discharge indicators including seasonal and annual Q5, Q10, Q50, Q90 and Q95 were prepared for future analyses. The seasonal an annual discharge trends were calculated using Thiel-Sen method, then discharge percent changes in the 1969-2012 for selected sub-basins were determined and seasonal and annual discharge map for each indicator was prepared. The result showed that seasonal and annual discharge in most selected sub-basin had decreasing and negative trend. The selected sub-basin in the southeast had less decreasing trend relative to other ones. Low flow (Q5, Q10) relative to high flow (Q90, Q95) had steeper decreasing trend. The spring high flow indicator related to Kakareza and Afrineh sub-basins had increasing trend. These two sub-basins were independent and are not influence by any other runoff. The increase in high flow in these two sub-basins can be caused by increase in temperature due to climate change and early snow melting in recent years

Keywords

[1] Abdul Aziz, O. and Burn, D. (2006). Trends and variability in the hydrological regime of the Mackenzie River Basin. Journal of Hydrology. 319: 282-294.
[2] Ashraf, M.S., Ahmad, I., Khan, N.M., Zhang, F., Bilal, A., Guo, J. (2021).Streamflow variations in monthly, seasonal, annual and extreme values using Mann-Kendall, Spearmen’s Rho and Innovative trend analysis. Water Resources Management. 35, 243-261.
[3] Bard, A., Renard, B., Lang, M., Giuntoli, I., Korck, J., Koboltschnig, G. and Volken, D. (2015). Trends in the hydrologic regime of Alpine rivers. Journal of Hydrology. 529: 1823-1837.
[4] Birsan, M., Molnar, P.,  Burlando, P. and Pfaundler, M. (2005). Streamflow trends in Switzerland. Journal of Hydrology. 314: 312-329.
[5] Groisman, P., Knight, R., Karl, T., Easterling, D., Sun, B. and Lawrimore, J. (2004) Contemporary changes of the hydrological cycle over the contiguous United States, trends derived from in situ observations. Journal of hydrometeorology. 5 (1) 64-85 (February 2004). AMS Abstract, Purchase, AMS Subscriber, NCDC Staff85.
[6] Hamed, K. (2008). Trend detection in hydrologic data: the Mann–Kendall trend test under the scaling hypothesis. Journal of Hydrology. 349: 350–363.
[7]  Hann Charles, T. (2002). Statistical Methods in Hydrology.Iowa State Press, A Blackwell Publishing Company.
[8] Hannaford, J. and Buys, G. (2012). Trend in seasonal river flow regimes in the UK. Journal of Hydrology. 475: 158-174.
[9] Helsel, D.R., R.M. Hirsch, 1992. Statistical Methods in Water Resources. Elsevier, Amsterdam.
[10] IPCC (Intergovernmental Panel on Climate Change). (2007). Climate Change (2007), The Physical Science Basis, A Contribution of Working Groups. I, to the Forth Assessment Report of the Intergovernmental Panel on Climate Change, Solomon and the Core Writing Team (eds). Cambridge University press, Cambridge United Kingdom and New York, USA.
[11] Li, L., Zhang, L., Wang, H., Wang, J., Yang, J., Jiang, D., Li, J. and Qin, D. (2007). Assessing the impact of climate variability and human activities on streamflow from the Wuding River basin in China. Hydrological Processes, 21: 3485–3491.
[12] Ma, Z., Kang, S.,  Zhang, L., Tong, L. and  Su, X. (2008). Analysis of impacts of climate variability and human activity on stream flow for a river basin in arid region of northwest China. Journal of Hydrology. 352: 239–249.
[13] Masseroni, D., Camici, S., Cislaghi, A., Vacchiano, G., Massari,C., Brocca,L. (in prees). 65-year changes of annual streamflow volumes across Europe with a focus on the Mediterranean basin.Hydrology and earth System Sciences.
[14] Mirabbasi Najafabadi, R. and  Dinpashoh, Y. (2010). Trend analysis of streamflow across the north west of Iran in recent three decades. Journal of Water and Soil, 24(4), 757-768.
[15] Mu, X., Zhang, L., McVicar, T., Chille, B. and Gau, P. (2007). Analysis of the impact of conservation measures on streamflow regime in catchments of the Loess Plateau, China. Hydrological Processes. 21: 2124–2134.
[16] Nabavi, S.S.,  Mostafazadeh, R.,  Asiabi-hir, R. nad Hazbav, Z. (2018). Determining the monthly utilizable water volume from Zahre River to secure drinking water of Handijan city. Journal of Irrigation and Water Engineering, 31, 107-120.
[17] Nassaji Zavareh, M., Khorshiddoust, A., Rasouli, A. and  Slajegheh, A.(2014). Assessment of discharge trend of Kasilian watershed. Iranian Journal of Watershed Management Science, 8(24), 1-8.
[18] Novotny, E. and Stefan, H. (2007). Stream flow in Minnesota: Indicator of climate change. Journal of Hydrology. 334: 319-333.
[19] Petrow, T., and Merz, B. (2009). Trends in flood magnitude, frequency and seasonality in Germany in the period 1951–2002. Journal of Hydrology. 371: 129-141.
[20] Rahimzadeh, F., Nassaji Zavareh., M. (2014). Effects of adjustment for non-climatic discontinuities on determination of temperature trends and variability over Iran. International Journal of Climatology, 34, 2079–2096.
[21] Scanlon, B., Jolly, I., Sophocleous, M. and Zhang, L. (2007). Global impacts of conversion from natural to agricultural ecosystem on water resources: quantity versus quality. Water Resources Research, 43: W03437, doi: 10.1029/2006WR005486.
[22] Sen, P.K., )1968(. Estimates of the regression coefficient based on Kendall’s Tau. Journal of American Statistical Association. 63: 1379–1389.
[23] Torabi Poodeh, H. and Emamgholizadeh, S. (2015). Trend analysis of streamflow changing of north watershed of Dez River with TFPW-MK procedure. Journal of Water and Soil Conservation, 22(3), 39-55.
[24] Wilson, D., Hisdal, H. and Lawrence, D. (2010). Has streamflow changed in the Nordic countries? Recent trends and comparisons to hydrological projections. Journal of Hydrology. 394: 334-346.
[25] Zhang, Y., Guan, D., Jin, C., Wang, A., Wu, J. and Yuan, F. (2011). Analysis of impacts of climate variability and human activity on streamflow for a river basin in northeast China. Journal of Hydrology. 410: 239-24.