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DOI	10.5194/hess-24-1633-2020
	The role of flood wave superposition in the severity of large floods
	Guse B.; Merz B.; Wietzke L.; Ullrich S.; Viglione A.; Vorogushyn S.
发表日期	2020
ISSN	1027-5606
起始页码	1633
结束页码	1648
卷号	24 期号:4
英文摘要	The severity of floods is shaped not only by event- and catchment-specific characteristics but also depends on the river network configuration. At the confluence of relevant tributaries with the main river, flood event characteristics may change depending on the magnitude and temporal match of flood waves. This superposition of flood waves may potentially increase the flood severity downstream in the main river. However, this aspect has not been analysed for a large set of river confluences to date. To fill this gap, the role of flood wave superposition in the flood severity at downstream gauges is investigated in four large river basins in Germany and Austria (the Elbe, the Danube, the Rhine and the Weser). A novel methodological approach to analyse flood wave superposition is presented and applied to mean daily discharge data from 37 triple points. A triple point consists of three gauges: one in the tributary as well as one upstream and downstream of the confluence with the main river respectively. At the triple points, differences and similarities in flood wave characteristics between the main river and the tributary are analysed in terms of the temporal match and the magnitudes of flood peaks. At many of the confluences analysed, the tributary peaks consistently arrive earlier than the main river peaks, although high variability in the time lag is generally detected. No large differences in temporal matching are detected for floods of different magnitudes. In the majority of cases, the largest floods at the downstream gauge do not occur due to perfect temporal match between the tributary and the main river. In terms of spatial variability, the impact of flood wave superposition is site-specific. Characteristic patterns of flood wave superposition are detected for flood peaks in the Danube River, where peak discharges largely increase due to inflow from alpine tributaries. Overall, we conclude that the superposition of flood waves is not the driving factor behind flood peak severity at the major confluences in Germany; however, a few confluences show the potential for strong flood magnifications if a temporal shift in flood waves was to occur. © 2020 Author(s).
语种	英语
scopus关键词	Catchments; Flood control; Floods; Gages; Daily discharge; Driving factors; Impact of floods; Methodological approach; River confluence; Spatial variability; Temporal matches; Temporal matching; Rivers; catchment; confluence; flood wave; gauge; peak discharge; river basin; river system; temporal analysis; tributary; Danube River
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/159453
作者单位	Guse, B., GFZ German Research Centre for Geosciences, Hydrology Section, Potsdam, Germany; Merz, B., GFZ German Research Centre for Geosciences, Hydrology Section, Potsdam, Germany, University of Potsdam, Institute for Environmental Sciences and Geography, Potsdam, Germany; Wietzke, L., GFZ German Research Centre for Geosciences, Hydrology Section, Potsdam, Germany; Ullrich, S., GFZ German Research Centre for Geosciences, Hydrology Section, Potsdam, Germany; Viglione, A., Vienna University of Technology, Institute of Hydraulic Engineering and Water Resources Management, Vienna, Austria, Politecnico di Torino, Department of Environment, Land and Infrastructure Engineering (DIATI), Torino, Italy; Vorogushyn, S., GFZ German Research Centre for Geosciences, Hydrology Section, Potsdam, Germany
推荐引用方式 GB/T 7714	Guse B.,Merz B.,Wietzke L.,et al. The role of flood wave superposition in the severity of large floods[J],2020,24(4).
APA	Guse B.,Merz B.,Wietzke L.,Ullrich S.,Viglione A.,&Vorogushyn S..(2020).The role of flood wave superposition in the severity of large floods.Hydrology and Earth System Sciences,24(4).
MLA	Guse B.,et al."The role of flood wave superposition in the severity of large floods".Hydrology and Earth System Sciences 24.4(2020).