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    Assessment of Hydrological Drought Index change over long period (1990-2020): The case of Iskenderun Gonencay Stream, Turkiye
    (Amer Inst Mathematical Sciences-Aims, 2023) Simsek, Serin Degerli; Capar, Omer Faruk; Turhan, Evren
    Recently, due to changes in the global climate, there have been significant increases in flood and drought events. The changes in wet and dry periods can be examined by various methods using hydrometeorological data to analyze climate disasters. In this study, Gonencay Stream in the Asi River Basin was chosen as the study area, which contains abundant underground and surface water reserves in Turkiye. Within this region, not only are the agricultural activities intense, but also hydraulic structure applications such as dams and reservoirs draw attention. Previous studies stated that meteorological and agricultural droughts have started to be noticed in the basin. Therefore, temporal variation analyses can positively contribute to assessing possible hydrological droughts in the following years. In this context, wet and drought periods were determined using the Streamflow Drought Index method at 3, 6, 9, and 12-month time scales with monthly average flow data observed between 1990 and 2020. At the same time, the number and probabilities of drought categories on a 12-month time scale, the first expected transition times between classifications, and the expected residence times between categories were specified. The study revealed that the most severe dry period occurred between 2013 and 2014 and was classified as Extremely Drought. The wettest period was around 2018-2019 and was classified as Extremely Wet. The largest expected time residence among all classifications was calculated for the Extremely Drought category with nine months, means that if the Extremely Drought period ever occurs, it remains for approximately nine months. While the Moderately Drought period occurred within one month following the Extremely Drought duration, and a Near Normal Wet period was observed three months after the Extremely Wet period. The most seen drought category for monthly calculations was the Near Normal Wet category, and was seen over 200 times with a 52.8% probability. Considering the Gonencay region, it is possible that any Extreme drought classification eventually regresses to normal.
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    Öğe
    Dynamic analysis of viscoelastic FGM shells with porosities on elastic foundation
    (Techno-Press, 2024) Calim, Mehmet Halil; Capar, Omer Faruk; Ozbey, Mehmet Bugra; Cuma, Yavuz Cetin
    This study investigates free and damped vibration behaviours of porous functionally graded shells supported by Winkler-Pasternak foundation, considering different geometries. Utilizing a higher-order shear deformation theory, the displacement field is determined. The equations of motion are formulated using Hamilton's principle, and the solutions are obtained Navier's method employing double Fourier series. Parametric studies regarding the effects of porosity, material distribution, elastic foundation, shell geometry and damping are carried out. Results are given in tabular and graphical form for the free and forced vibration analyses, respectively.
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    Öğe
    Investigation of Transition Possibilities between Drought Classifications Using Standardized Precipitation Index for Wet and Dry Periods-Lower Seyhan Plain, T?rkiye Case
    (Polish Soc Ecological Engineering-Ptie, 2023) Simsek, Serin Degerli; Capar, Omer Faruk; Turhan, Evren
    In this study, the Karaisali region of Turkiye, which has a semi-arid climate and is known to contain the exten-sive plains and rich water resources of the Seyhan Basin, was preferred as a study area for investigating wet and drought periods for a long timescale. Forty-one years of total precipitation data, between 1980 and 2020, belonging to the closest precipitation observation station located in the Karaisali region were used. By using the Standardized Precipitation Index (SPI), which is one of the frequently used meteorological drought indices, drought classifica-tion probabilities, expected first transition period and residence time in each drought severity class values were calculated for the 12-month time scale. As a result of the study, it was determined that the most drought period took place in 2012 according to the examined time duration. In addition, the most wet period was observed in 2001. When various time scales were considered, SPI-3 and SPI-6 have Near Normal Wet periods, while SPI-9 and SPI-12 have Near Normal Drought periods. Extremely Wet periods were more numerous, while Extremely Drought periods lasted longer. In addition, 3 months after the end of the drought categories, it can be seen that the Wet and Drought periods change into Near Normal Wet and Near Normal Drought periods.