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Drought, defined as a reduction in water resources over a period of time, has become one of the most costly natural disasters in recent years due to industrialisation, rapid population growth and climate change. The aim of this study is to gain a better understanding of drought trends in the Gediz Basin, Turkey, and to provide information to relevant institutions and organisations to mitigate the effects of drought. To achieve this goal, drought analyses were conducted using seven different drought indices and five different statistical methods based on data from six meteorological stations in the Gediz Basin. The results of the drought indices indicated the occurrence of both dry and wet periods at different times. Significant correlations were observed between the reconnaissance drought index (RDI) and the percent of normal index (PNI). Additionally, the standardized precipitation index (SPI) also captured drought conditions during the same period as the RDI and PNI. However, the correlation between SPI and the other two indices was lower, primarily due to the SPI detecting lower levels of drought severity. Trend analyses showed a decrease in precipitation values, especially during the summer months, and an increasing trend in temperature values. The study recommends using the RDI index to assess meteorological drought, while the Pinna Combinative index can be used to assess hydrological drought in the basin. These findings are expected to provide valuable insights for the development of drought management plans and necessary measures in the Gediz Basin.
Drought, defined as a reduction in water resources over a period of time, has become one of the most costly natural disasters in recent years due to industrialisation, rapid population growth and climate change. The aim of this study is to gain a better understanding of drought trends in the Gediz Basin, Turkey, and to provide information to relevant institutions and organisations to mitigate the effects of drought. To achieve this goal, drought analyses were conducted using seven different drought indices and five different statistical methods based on data from six meteorological stations in the Gediz Basin. The results of the drought indices indicated the occurrence of both dry and wet periods at different times. Significant correlations were observed between the reconnaissance drought index (RDI) and the percent of normal index (PNI). Additionally, the standardized precipitation index (SPI) also captured drought conditions during the same period as the RDI and PNI. However, the correlation between SPI and the other two indices was lower, primarily due to the SPI detecting lower levels of drought severity. Trend analyses showed a decrease in precipitation values, especially during the summer months, and an increasing trend in temperature values. The study recommends using the RDI index to assess meteorological drought, while the Pinna Combinative index can be used to assess hydrological drought in the basin. These findings are expected to provide valuable insights for the development of drought management plans and necessary measures in the Gediz Basin.
Natural disasters such as drought and flood along with global climate change, have increased in recent years. Therefore, there are many studies on drought and flood in the literature. In this study, they have been made drought analysis with various drought indices in Batman province located Southeastern Anatolia Region of Turkey which is generally an arid region in terms of climate. They were made analyses for Batman province with Percent of Normal Index (PNI), Modified Fournier Index (MFI) and Standardized Precipitation Index (SPI) that only takes into account the rainfall data and with De Martonne-Gotmann Index (DMGI) and Bagnauls-Gaussen Index (BGI), which take into account the rainfall and the temperature data together. 31-years of temperature and precipitation data between 1988 and 2018 belong to Batman province obtained from the Meteorology Regional Directorate were used in these analyses According to the analysis results, it was seen that the results of the five methods did not match exactly. According to the PNI; 23 years are normal, 1 year mildly arid, 5 years moderately arid and 2 years severely dry. According to the MFI; 4 years are very little rain, 18 years' little rain, 8 years' moderate precipitation and 1-year high rainfall. According to the SPI;1 year was excessive rainfall, 1-year heavy rainfall, 4 years' moderate precipitation,11 years lightly rainy,8 years mildly arid, 3 years moderately arid and 3 years very dry. According to the DMGI; 10 years are between semi-arid-humid, 21 years semi-arid. According to the BGI has been determined that all years are very dry. In the article, in addition to the annual analyses with the Standardized Precipitation Index seasonal analyses were also made. Contour maps of the analysis results for some methods were also visualized with the SURFER mapping program.
Bir havzanın uzun yıllar boyunca meydana gelen nemli ve kurak dönemleri yağışlardaki değişim ve nehir akım verilerindeki farklılıklar şeklinde kendini göstermektedir. Küresel iklim değişikliği sonucunda belirli zaman periyotlarında taşkın ve kuraklık problemleri ortaya çıkabilmektedir. Bu iki sorunun olası olumsuz etkilerini azaltabilmek adına gözlenmiş geçmiş kayıtlardan yararlanarak analizlerin yapılması ileriye dönük tahmin çalışmaları açısından doğru ve etkili bir yaklaşım sağlayacaktır. Bu çalışmada son zamanlarda mevcut su kaynaklarında debilerin azalmaya ve ciddi kuraklık etkilerinin görülmeye başladığı ifade edilen Fırtına Deresi Alt Havzası (Rize-Çamlıhemşin) uygulama alanı olarak tercih edilmiştir.
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