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<p>In order to understand the characteristics of drought in the Dongting Lake Basin and the propagation patterns of meteorological drought to hydrological drought, the standardized precipitation index (SPI) and the standardized runoff index (SRI) are calculated using precipitation reanalysis data and monthly runoff data of five hydrological stations from 1961 to 2022 in the Dongting Lake Basin. The drought response time of each sub-basin of Dongting Lake is determined based on the maximum Pearson correlation coefficient. A corresponding regional meteorological- hydrological drought propagation model is developed based on run theory and the linear functions is used to quantify the relationship between meteorological drought and hydrological drought characteristics in each sub-basin of Dongting Lake. The results reveal that the drought response times of the sub-basins of Dongting Lake range from 2 to 4&#xa0;months. Moreover, the probability of the propagation of meteorological drought to hydrological drought within these sub-basins is estimated to be between 58.54% and 88.57%. The distribution of hydrological drought sensitivity is consistent with the distribution of meteorological drought propagation rate. Moreover, under a certain level of meteorological drought conditions, the basin is most prone to experiencing hydrological drought events of the same level. Watersheds exhibiting higher triggering thresholds for meteorological drought severity tend to have shorter durations of hydrological drought events.</p>

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Analysis of the characteristics and propagation patterns of drought in Dongting Lake basin

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Han Wang,
  • Dongdong Zhang,
  • Yujie Peng

摘要

In order to understand the characteristics of drought in the Dongting Lake Basin and the propagation patterns of meteorological drought to hydrological drought, the standardized precipitation index (SPI) and the standardized runoff index (SRI) are calculated using precipitation reanalysis data and monthly runoff data of five hydrological stations from 1961 to 2022 in the Dongting Lake Basin. The drought response time of each sub-basin of Dongting Lake is determined based on the maximum Pearson correlation coefficient. A corresponding regional meteorological- hydrological drought propagation model is developed based on run theory and the linear functions is used to quantify the relationship between meteorological drought and hydrological drought characteristics in each sub-basin of Dongting Lake. The results reveal that the drought response times of the sub-basins of Dongting Lake range from 2 to 4 months. Moreover, the probability of the propagation of meteorological drought to hydrological drought within these sub-basins is estimated to be between 58.54% and 88.57%. The distribution of hydrological drought sensitivity is consistent with the distribution of meteorological drought propagation rate. Moreover, under a certain level of meteorological drought conditions, the basin is most prone to experiencing hydrological drought events of the same level. Watersheds exhibiting higher triggering thresholds for meteorological drought severity tend to have shorter durations of hydrological drought events.