نوع مقاله : مقاله پژوهشی
نویسندگان
1 محقق سازمان تحقیقات، آموزش و ترویج کشاورزی
2 دانشکده منابع طبیعی/ دانشگاه صنعتی اصفهان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Over recent decades, Iran and especially its western regions have suffered from devastating floods. On the other hand, planning and designing hydraulic structures require information from flood magnitude corresponding to a given occurrence probability. Hence, in this study, we aimed to determine flood homogeneous regions and regional growth curves, using L-moments and flood index method, for annual maximum flow of 62 sub-basins in Great-Karoon and Karkhe basins. Moreover, the impacts of droughts and hydraulic structures on the stationary and stochastic nature of floods were investigated using Mann-Kendall trend test, Pettitt’s change point detection test (CPD) and graphical interpretations. It was found that there are five hydrological homogeneous regions in study area. The goodness of fit tests results showed that the Generalized Pareto (GPA) distribution for the first and second regions, the Generalized Normal (GNO) distribution for the third region and the Generalized Logistic (GPA) distribution for the fourth and fifth regions are the most appropriate regional statistical distributions. Also, maximum daily flows corresponding to 2, 5, 10, 25, 50, 100, 500 and 1000 year return periods were estimated for all study sub-basins. Regional flood frequency analyzes revealed that for 100-year return period the fifth region’s sub-basins, with 4060 m3/s discharge on average, have the highest maximum daily flow. The average 100-year maximum daily flows in the regions I, II, III and IV were estimated around 632, 682, 460 and 429 (m3/s), respectively.
کلیدواژهها [English]
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