不同季节气象干旱向水文干旱的传播及其动态变化

研究变化环境下气象干旱向水文干旱的传播与影响机制,有利于揭示水文干旱的形成过程与机理,从而建立基于气象干旱的水文干旱预警.为揭示不同季节气象干旱向水文干旱的传播动态变化及其驱动因素,本研究以无定河、窟野河和沁河流域为研究区域,采用标准化降水指数(SPI)和标准化径流指数(SRI)分别表征气象干旱和水文干旱,分析气象、水...

Propagation and dynamic change of meteorological drought to hydrological drought in different seasons

Study on the propagation of meteorological drought to hydrological drought and its influence mech- anism under the changing environment is helpful to reveal the formation process and mechanism of hydrolog- ical drought,so as to establish the hydrological drought early warning based on meteorological drought. How- ever, the dynamic changes and driving factors of the propagation of meteorological to hydrological drought in different seasons have not yet been revealed. In view of this,the Wuding River,Kuye River and Qinhe River basins were selected as the research area in this study, standardized precipitation index (SPI) and standardized runoff index (SRI) were adopted to characterize meteorological drought and hydrological drought, respectively, and the temporal characteristics of meteorological and hydrological drought were ana- lyzed. Then,the propagation time of meteorological to hydrological drought and its dynamics in different sea- sons were explored. Furthermore,to explore the main factors and physical mechanism affecting the propaga- tion of drought in different seasons. The results show that:(1) meteorological and hydrological droughts tend to aggravate, and the response time of hydrological drought to meteorological drought has hysteresis; (2) except for the Kuye River basin, the overall drought propagation tends to be faster in different sea- sons, indicating that the speed of water cycle in these areas is faster;(3) the accelerated propagation time of the Wuding River and Qinhe River basins may be related to the increasing precipitation and temper- ature, whilst, the slow propagation time may be related to coal mining and reservoir construction in the Kuye River basin.