DOI: 10.1016/j.quascirev.2013.01.023
Scopus记录号: 2-s2.0-84874725098
论文题名: Outburst flood evolution at Russell Glacier, western Greenland: Effects of a bedrock channel cascade with intermediary lakes
作者: Carrivick J.L. ; Turner A.G.D. ; Russell A.J. ; Ingeman-Nielsen T. ; Yde J.C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 67 起始页码: 39
结束页码: 58
语种: 英语
英文关键词: GLOF
; Hydraulic ponding
; Hydraulics
; Hydropeaking
; Jökulhlaup
; Megaflood
Scopus关键词: Aerial Photographs
; Bathymetric survey
; Bed shear stresss
; Bedrock channels
; Cross sectional area
; Flow recirculation
; Flow regimes
; Glacial lake outburst flood
; GLOF
; Greenland
; Grid resolution
; Hazard mitigations
; Hydraulic ponding
; Hydropeaking
; In-channels
; Kinematic waves
; Megaflood
; Modern analogues
; Outburst floods
; Peak discharge
; Time to peak
; Flood control
; Hydraulics
; Lakes
; Petroleum reservoir evaluation
; Ponding
; Floods
; aerial photograph
; bathymetric survey
; bedrock
; channel morphology
; digital elevation model
; flood frequency
; Froude number
; intermediate water
; outburst
; peak discharge
; Quaternary
; shear stress
; Arctic
; Greenland
; Russell Glacier
英文摘要: Glacial lake outburst floods have produced a distinctive and widespread Quaternary record both onshore and offshore via widespread and intense geomorphological impacts, yet these impacts remain poorly understood due to a lack of modern analogues. This study therefore makes a systematic quantification of the evolution of a bedrock-channelled outburst flood. Channel topography was obtained from digitised aerial photographs, a 5 m grid resolution DEM and bathymetric surveys. Flood inundation was measured in the field from dGPS measurements. Flood evolution was analysed with application of a numerical model. Novel flood metrics, including 'rate-of-rise-to-peak' and 'persistence-above-a-value' of hydraulics were calculated. The key findings were that outburst floods; (i) that enter intermediary lakes are dramatically attenuated in terms of propagation whilst basin filling proceeds to the outlet level, dissipated of energy due to considerable flow recirculation during the rising stage of the flood, and after overtopping of the outlet are moderated in terms of peak discharge; (ii) can have kinematic waves that are introduced to a flood via hydraulic ponding, (iii) may develop a partitioning of flow regimes for instantaneous peak discharge, bed shear stress and Froude number due to time-transgressive changes in channel cross-section; specifically between inner channel and overbank regions. Furthermore, normalised change in cross-sectional area and normalised change in channel slope can be used to suggest the relative magnitude of instantaneous peak discharge. Net erosion along a reach can be related to hydraulic persistence above a marker value and net deposition can be related to a 'time to peak' value. Reconstructions of Quaternary outburst floods should consider the importance of including intermediary lakes. Modern hazard mitigation studies could usefully note the potential use of reservoirs as an outburst flood alleviation resource. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60666
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography, University of Leeds, Leeds, West Yorkshire LS2 9JT, United Kingdom; School of Geography, Politics and Sociology, Newcastle University, Newcastle-upon-Tyne NE1 7RU, United Kingdom; Arctic Technology Centre, Technical University of Denmark, Kemitorvet, Building 204, DK-2800 Kgs. Lyngby, Denmark; Sogn og Fjordane University College, NO-6851 Sogndal, Norway
Recommended Citation:
Carrivick J.L.,Turner A.G.D.,Russell A.J.,et al. Outburst flood evolution at Russell Glacier, western Greenland: Effects of a bedrock channel cascade with intermediary lakes[J]. Quaternary Science Reviews,2013-01-01,67