DOI: 10.5194/hess-24-1633-2020
论文题名: The role of flood wave superposition in the severity of large floods
作者: Guse B. ; Merz B. ; Wietzke L. ; Ullrich S. ; Viglione A. ; Vorogushyn S.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 4 起始页码: 1633
结束页码: 1648
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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162743
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Guse B.,Merz B.,Wietzke L.,et al. The role of flood wave superposition in the severity of large floods[J]. Hydrology and Earth System Sciences,2020-01-01,24(4)