西南地区气象干旱向水文干旱传播的特征

为了解西南地区气象干旱向水文干旱传播的特征，采用西南地区1968—2017年101个气象站观测资料和8个水文站月径流资料，计算了标准化降雨蒸散发指数(SPEI)和标椎化径流指数(SRI),基于皮尔逊相关系数(PCC)确定了干旱响应时间并结合游程理论识别、融合和剔除干旱事件，构建了线性干旱传播模型并确定了西南地区部分流域气象干旱向水文干旱传播的触发阈值。结果表明：西南地区干旱响应时间为2～7月；水文干旱敏感度分布与气象干旱传播率分布较为一致；干旱烈度传播阈值较小的流域，水文干旱事件历时更长。

Characteristics of propagation from meteorological drought to hydrological drought in Southwest China

To study the characteristics of propagation from meteorological drought to hydrological drought in Southwest China, observation data of 101 meteorological stations and monthly runoff data of 8 hydrological stations in Southwest China from 1968 to 2017 were used to calculate standardized precipitation evapotranspiration index (SPEI) and standardized runoff index (SRI). The drought response time (DRT) was determined based on the Pearson correlation coefficient (PCC), which was used to identify, pool and exclude the drought events combined with the run theory. The linear drought propagation model was constructed and the trigger thresholds of propagation from meteorological drought to hydrological drought in part of the basins of Southwest China were determined. The results indicate that the DRT in Southwest China is 2-7 months and the sensitivity distribution of hydrological drought is consistent with the drought translation rate of meteorological drought. The duration of hydrological drought event is longer in the basins with smaller propagation threshold of drought intensity.