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DOI	10.5194/hess-23-3117-2019
	Assessing the characteristics and drivers of compound flooding events around the UK coast
	Hendry A.; Haigh I.D.; Nicholls R.J.; Winter H.; Neal R.; Wahl T.; Joly-Lauge A.; Darby S.E.
发表日期	2019
ISSN	1027-5606
起始页码	3117
结束页码	3139
卷号	23 期号:7
英文摘要	In low-lying coastal regions, flooding arises from oceanographic (storm surges plus tides and/or waves), fluvial (increased river discharge), and/or pluvial (direct surface run-off) sources. The adverse consequences of a flood can be disproportionately large when these different sources occur concurrently or in close succession, a phenomenon that is known as "compound flooding". In this paper, we assess the potential for compound flooding arising from the joint occurrence of high storm surge and high river discharge around the coast of the UK. We hypothesise that there will be spatial variation in compound flood frequency, with some coastal regions experiencing a greater dependency between the two flooding sources than others. We map the dependence between high skew surges and high river discharge, considering 326 river stations linked to 33 tide gauge sites. We find that the joint occurrence of high skew surges and high river discharge occurs more frequently during the study period (15-50 years) at sites on the south-western and western coasts of the UK (between three and six joint events per decade) compared to sites along the eastern coast (between zero and one joint events per decade). Second, we investigate the meteorological conditions that drive compound and non-compound events across the UK. We show, for the first time, that spatial variability in the dependence and number of joint occurrences of high skew surges and high river discharge is driven by meteorological differences in storm characteristics. On the western coast of the UK, the storms that generate high skew surges and high river discharge are typically similar in characteristics and track across the UK on comparable pathways. In contrast, on the eastern coast, the storms that typically generate high skew surges are mostly distinct from the types of storms that tend to generate high river discharge. Third, we briefly examine how the phase and strength of dependence between high skew surge and high river discharge is influenced by the characteristics (i.e. flashiness, size, and elevation gradient) of the corresponding river catchments. We find that high skew surges tend to occur more frequently with high river discharge at catchments with a lower base flow index, smaller catchment area, and steeper elevation gradient. In catchments with a high base flow index, large catchment area, and shallow elevation gradient, the peak river flow tends to occur several days after the high skew surge. The previous lack of consideration of compound flooding means that flood risk has likely been underestimated around UK coasts, particularly along the south-western and western coasts. It is crucial that this be addressed in future assessments of flood risk and flood management approaches. © Author(s) 2019.
语种	英语
scopus关键词	Aerodynamics; Binary alloys; Catchments; Coastal zones; Flood control; Rivers; Runoff; Storms; Tide gages; Base flow index; Coastal regions; Elevation gradient; Flood management; Future assessment; Meteorological condition; Spatial variability; Spatial variations; Floods; assessment method; baseflow; catchment; elevation; flood control; flood frequency; flooding; peak flow; risk assessment; river discharge; runoff; skewness; spatial variation; storm surge; tide gauge; United Kingdom
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159639
作者单位	Hendry, A., Ocean and Earth Science National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom; Haigh, I.D., Ocean and Earth Science National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom; Nicholls, R.J., School of Engineering, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom; Winter, H., Natural Hazards and Environmental Group, EDF Energy RandD UK Centre, Croydon, CRO 2AJ, United Kingdom; Neal, R., Department of Weather Science, Met Office, Exeter, EX1 3PB, United Kingdom; Wahl, T., Civil Environmental, and Construction Engineering and National, Center for Integrated Coastal Research, University of Central Florida, 12800 Pegasus Drive, Suite 211, Orlando, FL 32816-2450, United States; Joly-Lauge, A., Natural Hazards and Environmental Group, EDF Energy RandD UK Centre, Croydon, CRO 2AJ, United Kingdom; Darby, S.E.,...
推荐引用方式 GB/T 7714	Hendry A.,Haigh I.D.,Nicholls R.J.,et al. Assessing the characteristics and drivers of compound flooding events around the UK coast[J],2019,23(7).
APA	Hendry A..,Haigh I.D..,Nicholls R.J..,Winter H..,Neal R..,...&Darby S.E..(2019).Assessing the characteristics and drivers of compound flooding events around the UK coast.Hydrology and Earth System Sciences,23(7).
MLA	Hendry A.,et al."Assessing the characteristics and drivers of compound flooding events around the UK coast".Hydrology and Earth System Sciences 23.7(2019).