Altered drought propagation under the influence of reservoir regulation
Altered drought propagation under the influence of reservoir regulation
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DOI：
10.1016/j.jhydrol.2021.127049
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发表时间：
2021-10
影响因子：
6.4
通讯作者：
Zikang Xing;Miaomiao Ma;Xuejun Zhang;G. Leng;Z. Su;J. Lv;Zhongbo Yu;Peng Yi
中科院分区：
文献类型：
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作者：
Zikang Xing;Miaomiao Ma;Xuejun Zhang;G. Leng;Z. Su;J. Lv;Zhongbo Yu;Peng Yi
人类干预（HI）正在显着影响地表水文循环，从而改变水文干旱的发生。然而，迄今为止，HI如何影响气象干旱向水文干旱的传播仍不清楚。在本研究中，我们提出了一个定量诊断框架，评估了HI对中国典型的水库主导型大凌河流域（DRB）不同尺度干旱传播的影响，其中标准化降水指数（SPI）和标准化径流指数（SSI）分别用于识别气象干旱（MD）和水文干旱（HD）。我们的结果表明，现场径流记录在2003年左右出现了明显的转折点，与DRB最大水库的运行时间一致。受水库调度影响，HD频率明显增强，MD与HD相关性呈下降趋势，特别是在丰水期。上游、下游和MD-HD干旱传播的季节性均发生显着变化，干旱事件由秋入夏提前，秋季干旱加剧。水库调度通过增加干旱持续时间和严重程度改变了HD事件的特征。我们的结果强调了水库对干旱传播的强烈加剧作用。
Human interventions (HI) are significantly affecting the land surface hydrological cycle, and thus altering the occurrence of hydrological drought. So far, however, how HI affect the propagation from meteorological to hydrological drought is still unclear. In this study, we proposed a quantitative diagnosis framework and assessed the impacts of HI on drought propagation across varying scales over the typical reservoir-dominant Daling River basin (DRB) in China, in which the Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI) were utilized to identify the meteorological drought (MD) and hydrological drought (HD), respectively. Our results show that thein-situstreamflow records were found with an evident turning point around 2003, coincident with the operation of the largest reservoir in DRB. Under the influence of reservoir operation, the HD frequency saw an obvious intensification and the correlations between MD and HD exhibited a decreasing tendency, especially during the wet season. The seasonality of drought propagation changed significantly for both up-downstream and MD-HD, as indicated by the advance of drought events from autumn to summer and the aggravation of autumn drought. The reservoir operation changed the HD events characteristics by increasing the drought duration and severity. Our results highlight the strong aggravating effect of reservoirs on drought propagation.