نوع مقاله : مقاله علمی پژوهشی
نویسندگان
1 دانش آموخته کارشناسی ارشد آبخیز داری
2 عضو هیات علمی دانشگاه گلستان
3 عضو هیات علمی دانشگاه مازندران
4 عضو هیات علمی دانشگاه علوم کشاورزی و منابع طبیعی ساری
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
For optimization management planning of the water resources, particular in vast watershed, recognition of the hydrological relationships to determine influential hydrological factors in the hydrologic drought is necessary. Drought is one of the natural factors which in recent decades damaged many areas and environments in not only in Iran but also in the world. This research investigates factors that influence the hydrological drought analysis in Lorestan watershed province. In this research, we first selected 25 stations of Lorestan province which were suitable in geographic transmittance status and area varieties. The physiographical data of considered stations were derived through the topographic maps. These data were analyzed by factor analysis for 15 measured variables in the considered stations by R-3-1-1 statistical software. The Results have showed that the factors of rainfall, area, drainage density, and areas with poor vegetation as main factors have stated 84.684 percent of total variations in the total selected data. Then, four selected factors were classified in to two homogenous groups by the cluster analysis. In order to test the accuracy of the cluster analysis in the homogenous areas, discriminant analysis was performed. Based on the four main selected factors in two homogenous areas, we have derived a differentiating function. The differentiating function coefficients in the standard mode showed that in the formed function, average rainfall and area with weight factor of 0.979 and 0.877, respectively, were the most significant group differentiator variables. Finally the coefficient correlation values indicate that these two groups are distinct from each other.
کلیدواژهها [English]
- قاسمی، احمد رضا. 1379. خشکسالی و بارندگی مازاد ایران و ارتباط آن با پدیده ال نینو- نوسانات جنوبی، پایاننامه کارشناسی ارشد، استاد راهنما سید محمدجعفر ناظم السادات، دانشگاه شیراز، دانشکده منابع طبیعی.
11. Bates, B.C., Rahman, A., Mein, R.G. and Weinmann, P.E. 1998. Climatic and physical factors that influence the homogeneity of regional floods in southeastern Australia, Water Resources Research, 34:3369-3380.
12. Eslamian, S., Zareei, A. and Abreshamchi, S. 2005. Estimation of flows regional flow in the river basin of Mazandaran, Science and Technology Journal of Agriculture and Natural Resources, 8(1): 27-38.
13. Hall, M.J. and Minns, W.A. 2009. The classification of hierologically homogeneous regions, Hydraulic and Environment Engineering Hydrological Sciences, 44(5).
14. Jonathan, I., Graciana, P. and Kenneth, M. 2004. Evaluation of the impact of climate change on hydrology and water resources in Swaziland, Physics and Chemistry of the Earth, 29: 1193–1202.
15. Kjeldsen, T.R. and Smithers, J.C. 2002. Regional flood frequency analysis in the KwaZulu-Natal provinces South Africa, using the index-flood method, Journal of Hydrology, 255: 194-211.
16. Modarres, R. 2008. Regional Frequency Distribution Type of Low Flow in North of Iran, Journal of Water Resource Management, 22: 823 – 841.
17. Nalbantis, I. and Tsakiris, G. 2008. Assessment of Hydrological Drought Revisited, Water Resources Bulletin, 18(6):965-970.
18. Nu¨tzmann, G. And Mey, S. 2007. Model-based estimation of runoff changes in a small lowland watershed of Germany, Journal of Hydrology, 334: 467– 476.
19. Shabani, M. 2003. Land use assessment methods in statistics drought intensity zoning Fars Province, Journal of Water Engineering, 2(2):31-36.
20. Siyue, l. 2009. Water quality in the upper Han River china: The impacts of land use land cover in riparian buffer zone, Journal of Hazardous materials, 165: 467-476.
21. Wiliams, B., Onsman, A. and Brow, T. 2010. Exploratory factor analysis: A five- step guide for novices, Journal of Emergency Primary Health Care, 8: 220-234.
22. Worrall, F., Burt, T.P. and Adamson, J.K. 2007. Change in runoff initiation probability over a severe drought in a peat soil Implications for flow paths, Journal of Hydrology, 345: 16– 26.
23. Yue, S. and Wang, C.Y. 2004. Scaling of Canadian low flows, Stochastic Environmental Research and Risk Assessment, 18: P 291-305.
24. Zaidman, M.D. 2003. Flow-duration-frequency Behavior of British rivers based on annual minimum data, Journal of Hydrology, 277, (3-4)195-213.