| Characteristics and responses of hydrological and meteorological drought in Chaobai River Basin |
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| DOI：10.7606/j.issn.1000-7601.2019.02.32 |
| Key Words: hydrological drought meteorological drought the run theory drought response relationship the Chaobai River Basin |
| Author Name | Affiliation | | XU Yi-ran | School of Resources and Earth Science, China University of Mining and Technology, Xuzhou， Jiangsu 221008, China
Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | LU Fan | Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | XIE Zi-bo | School of Resources and Earth Science, China University of Mining and Technology, Xuzhou， Jiangsu 221008, China
Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | ZHU Kui | School of Resources and Earth Science, China University of Mining and Technology, Xuzhou， Jiangsu 221008, China | | SONG Xinyi | Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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| Abstract: |
| Based on the monthly precipitation data from 7 meteorological stations in the Chaobai River Basin and monthly inflow data of the Miyun reservoir from 1960-2011, the Standard Precipitation Index (SPI) and the Streamflow Drought Index (SDI) were used to represent meteorological and hydrological drought, respectively. We analyzed the variation of hydrological and meteorological drought by using the run theory, moving t-test technique and the Mann-Kendall test method. The Spearman correlation test was further applied to explore the lead-lag relationship between both indices. The results indicated that: most of the meteorological drought events in the study period did not last long, and the meteorological drought events lasted for 1-2 months that accounted for 67.18% of the total amount of drought events in the study period. Additionally, the trend of drought intensity and drought duration in meteorological drought was not apparent, and the linear slope values of the two were only -0.025 and -0.005, respectively. Unlike meteorological droughts, the hydrological droughts had significant increasing tends in both drought intensity and duration with linear slope values of -0.419 and 0.228 respectively. We also found some hydrological drought events with long drought duration and greater drought intensity, the drought events lasting over 4 months accounted for 46.54% of the total amount in the study period, and the longest drought lasted 45 months. Both meteorological and hydrological drought showed abrupt changes in 1980 and 1998. Since the end of 1990s, long-lasting hydrological drought events occurred frequently. Analysis of the relationship between meteorological and hydrological drought indices showed that the occurrence of a hydrological drought event could be about 1 month behind a meteorological drought event. |
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