DOI: 10.5194/hess-20-4265-2016
Scopus记录号: 2-s2.0-84975859308
论文题名: A systematic assessment of drought termination in the United Kingdom
作者: Parry S ; , Wilby L ; R ; , Prudhomme C ; , Wood J ; P
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 10 起始页码: 4265
结束页码: 4281
语种: 英语
Scopus关键词: Catchments
; Flow of water
; Runoff
; Sensitivity analysis
; Stream flow
; Water resources
; Catchment properties
; Development phasis
; Historical perspective
; Hydrological response
; Long-term variability
; Objective approaches
; Resource managers
; Systematic assessment
; Drought
; catchment
; drought
; flooding
; historical perspective
; inventory
; rainfall
; river flow
; sensitivity analysis
; water footprint
; water management
; water resource
; England
; Thames River [England]
; United Kingdom
英文摘要: Drought termination can be associated with dramatic transitions from drought to flooding. Greater attention may be given to these newsworthy and memorable events, but drought terminations that proceed gradually also pose challenges for water resource managers. This paper defines drought termination as a distinctive phase of the event. Using observed river flow records for 52 UK catchments, a more systematic and objective approach for detecting drought terminations is demonstrated. The parameters of the approach are informed by a sensitivity analysis that ensures a focus on terminations of multi-season to multi-year droughts. The resulting inventory of 467 drought terminations provides an unprecedented historical perspective on this phenomenon in the UK. Nationally and regionally coherent drought termination events are identifiable, although their characteristics vary both between and within major episodes. Contrasting drought termination events in 1995-1998 and 2009-2012 are examined in greater depth. The data are also used to assess potential linkages between metrics of drought termination and catchment properties. The duration of drought termination is moderately negatively correlated with elevation (irsg‰Combining double low lineg‰ĝ'0.47) and catchment average rainfall (irsg‰Combining double low lineg‰ĝ'0.42), suggesting that wetter catchments in upland areas of the UK tend to experience shorter drought terminations. More urbanized catchments tend to have gradual drought terminations (contrary to expectations of flashy hydrological response in such areas), although this may also reflect the type of catchments typical of lowland England. Significant correlations are found between the duration of the drought development phase and both the duration (irsg‰Combining double low lineg‰ĝ'0.29) and rate (irsg‰Combining double low lineg‰0.28) of drought termination. This suggests that prolonged drought development phases tend to be followed by shorter and more abrupt drought terminations. The inventory helps to place individual events within a long-term context. The drought termination phase in 2009-2012 was, at the time, regarded as exceptional in terms of magnitude and spatial footprint, but the Thames river flow record identifies several comparable events before 1930. The chronology could, in due course, provide a basis for exploring the complex drivers, long-term variability, and impacts of drought termination events. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78704
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Ecology and Hydrology, Wallingford, Oxfordshire, United Kingdom; Department of Geography, Loughborough University, Loughborough, Leicestershire, United Kingdom
Recommended Citation:
Parry S,, Wilby L,R,et al. A systematic assessment of drought termination in the United Kingdom[J]. Hydrology and Earth System Sciences,2016-01-01,20(10)