Assessment of hydrological response to multiyear drought: Insights from lag characteristics and shift magnitude

作者：Miao Li, Shuzhen Li, Qiang Liu, Yinhong Kang, Liqiao Liang, Xiaomin Yuan, Junlong Zhang, Xuan Wang, Chunhui Li · 发表于：Hydrological Processes · 年份：2022 · DOI：10.1002/hyp.14636 · 被引用次数：12 · 研究领域：Hydrology and Watershed Management Studies、Hydrology and Drought Analysis、Flood Risk Assessment and Management

Abstract The analysis of the hydrological response to meteorological drought events can lead to a deeper understanding of alterations in hydrological processes that can be used to help maintain environmental flow (e‐flow) in aquatic ecosystems. In this study, we first identified an extreme meteorological drought event and then assessed its hydrological response. Monthly precipitation anomalies were used to identify meteorological drought, while the Lyne–Hollick method (LH filter) was used alongside the baseflow recession constant (calculated using the Automatic Baseflow Identification Technique [ABIT]) to isolate baseflow in the Baiyangdian basin. Results showed that an extreme meteorological drought event occurred in August 1996, continuing for a total of 127 months, which resulted in prolonged hydrological drought (i.e., streamflow and baseflow). A time lag was generally observed between the end of the meteorological drought event and the end of the hydrological drought event, where baseflow recovery lagged behind streamflow (runoff) recovery. Additionally, drought led to an unstable shift in the precipitation‐streamflow relationship that subsequently led to a reduction in the annual streamflow of coinciding annual precipitation compared with the historical relationship. Drought also led to a longer response between precipitation and runoff events. Results from this study show that the hydrological response to meteorological drought event is important for water resource man...