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http://dx.doi.org/10.3741/JKWRA.2018.51.6.471

Analysis of peak drought severity time and period using meteorological and hydrological drought indices  

Kim, Soo Hyun (Department of Civil Engineering, Seoul National University of Science and Technology)
Chung, Eun-Sung (Department of Civil Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Korea Water Resources Association / v.51, no.6, 2018 , pp. 471-479 More about this Journal
Abstract
This study analyzed the peak time of drought severity and drought period using meteorological and hydrological drought indices. Standardized Precipitation Index (SPI) using rainfall data was used for meteorological drought and Streamflow Drought Index (SDI) and Standardized Streamflow Index (SSI) using streamflow data were used for the hydrological drought. This study was applied to the Cheongmicheon watershed which is a mixture area for rural and urban regions. The rainfall data period used in this study is 32.5 years (January of 1985~June of 2017) and the corresponding streamflow was simulated using SWAT. After the drought indices were calculated using the collected data, the characteristics of drought were analyzed by time series distribution of the calculated drought indices. Based on the results of the this study, it can be seen that hydrological drought occurs after meteorological drought. The difference between SDI and SPI peak occurrence time, difference in drought start date and average drought duration is greater than SSI and SPI. In general, SSI shows more severe than SDI. Therefore, various drought indices should be used at the identification of drought characteristics.
Keywords
Peak drought severity time; Meteorological drought index; Hydrological drought index; SWAT;
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