Analysis of Drought at Different Timescales by Standardized Precipitation Index in Kocadere Basin
2019
Yuceeri̇m, Gozen | Yilmaz, Gulay | Etoz, Merve | Acar, Oguz
Drought is a natural disaster which affect water resources, agriculture and all living things alsocauses socio-economic damages. Numerous indices have been developed to characterize thedrought, and these indices are widely used for drought monitoring. In this study, frequently usedSPI (Standardized Precipitation Index) was calculated for different time periods. Thus, it is aimed to evaluate the guidance of the SPI, which is a meteorological drought index, in terms of agricultural and hydrological drought for different periods. In the study, 30 years (1987-2016) precipitation data which belongs to the Kocadere Basin have been used. The data obtained by considering the water year (1 October – 30 September), from the rainfall stations which were located in basin area. With this data SPI was calculated for 3 different time periods (SPI-1, SPI-6 and SPI-12). Drought severity classes in different periods were determined and precipitation - flow data were used for evaluations. As an evaluation, when the index value fell below zero, is considered as the beginning of the dry season. In this circumstance, the period between 1987-2016 water year is classify as, 48.33% dry, 51.67% rainyfor SPI-1; 51.67% dry, 48.33% rainy for SPI-6 and 50.00% dry and 50.00% rainy for SPI-12. Its observedthat, SPI-1 values were consistent with measured rainfall and reflect the index value. Moreover, SPI-6values were found to be a good indicator of precipitation monitoring between october and march, which is an important period for this basin. The annualized index values (SPI-12) clarify the increase and decrease in total annual flows measured in the basin.
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