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Ege Üniversitesi (2019)

Drought analysis in Gediz basin

TEMEL Ibrahim

Titre : Drought analysis in Gediz basin

Gediz havzasında kuraklık analizi

Auteur : TEMEL Ibrahim

Université de soutenance : Ege Üniversitesi

Grade : Master 2019

Turkey is situated in a semi-arid region. Especially in recent years, drought has been seen as a serious threat both in our country and in the world in terms of the warming and climatic changes experienced on a global scale. In this respect, drought-related research is becoming increasingly important. In this study, the drought in Gediz Basin in the last 50 years was examined by with streamflow drought index (SDI) and standardized precipitation index (SPI). In this stage, rainfall data are arranged according to water year in order to be compatible with flow data. Rainfall series of 3, 6, 9 and 12 months period were examined according to SDI index. In the first stage of the thesis study, 3, 6, 9 and 12 month period flow and rainfall series were tested at a level of α = 10% significance for normality, and 3-month totals did not conform to normal distribution and excluded from the study. In the next stage, the streamflow and precipitation indices were calculated and classified according to the degree of drought. Thus, arid, severe arid and extremely dry years have been revealed. Then, in order to determine periodic droughts, water deficiency and redundancy graphs of consecutive years were obtained and wet and dry periods were determined in the last 50 years. Finally, frequency analysis was performed in order to estimate the frequency and intensity of the droughts, and 50- and 100-year drought indices and 50- and 100-year low flows were estimated with these indices. It is suggested that this thesis can be applied to larger regions in terms of both determining hydrological and meteorological droughts and estimating low flows of certain return periods. Keywords : Drought Analysis, Streamflow Drought Index (SDI), Standardized Precipitation Index (SPI)


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