فهرست نشریات علمی دسترسی آزاد ایران

This study evaluates meteorological and hydrological droughts in the Darreh Dozdan River Basin (DDRB) in Iran, while also investigating the relationship between these two types of droughts. Additionally, the study aims to assess the effectiveness of gamma and log-normal distributions in estimating the values of the Streamflow Drought Index (SDI). In this study, monthly streamflow and precipitation data from the Tange Siab station for the years 1970 to 2022 were used to monitor hydrological and meteorological drought. Six indices available in the DIP software were used to monitor meteorological drought, while hydrological drought was assessed with the SDI and DrinC software. To investigate the relationship between meteorological and hydrological drought, the Pearson correlation test was used. The results indicated that the Standardized Precipitation Index (SPI) and the China-Z Index (CZI), with a determination coefficient of approximately 0.7, are the most suitable indices for assessing meteorological drought in the DDRB. The findings showed that the DDRB has experienced meteorological and hydrological droughts for 9 and 25 years, respectively, with varying intensities according to the SPI and SDI indices. Furthermore, the results revealed a positive but weak correlation between meteorological and hydrological drought indices, suggesting that hydrological drought in the DDRB is primarily influenced by human activities. Additionally, both distributions had the same performance in hydrological drought classification.