Quantifying different riverbank erosion processes during an extreme flood event

Grove, James R., Croke, Jacky and Thompson, Christopher (2013) Quantifying different riverbank erosion processes during an extreme flood event. Earth Surface Processes and Landforms, 38 12: 1393-1406. doi:10.1002/esp.3386

Author Grove, James R.
Croke, Jacky
Thompson, Christopher
Title Quantifying different riverbank erosion processes during an extreme flood event
Journal name Earth Surface Processes and Landforms   Check publisher's open access policy
ISSN 0197-9337
Publication date 2013
Year available 2013
Sub-type Article (original research)
DOI 10.1002/esp.3386
Open Access Status
Volume 38
Issue 12
Start page 1393
End page 1406
Total pages 14
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley and Sons Ltd.
Collection year 2013
Language eng
Abstract Riverbank erosion is a major contributor to catchment sediment budgets. At large spatial scales data is often restricted to planform channel change, with little information on process distributions and their sediment contribution. This study demonstrates how multi-temporal LiDAR and high resolution aerial imagery can be used to determine processes and volumes of riverbank erosion at a catchment scale. Remotely sensed data captured before and after an extreme flood event, enabled a digital elevation model of difference (DoD) to be constructed for the channel and floodplain. This meant that: the spatial area that could be assessed was extensive; three-dimensional forms of bank failures could be mapped at a resolution that enabled process inference; and the volume and rates of different bank erosion processes over time could be assessed. A classification of riverbank mass failures, integrating form and process, identified a total of 437 mass failure polygons throughout the study area. These were interpreted as wet flow mass failures based on the presence of a well defined scarp wall and the absence of failed blocks on the failure floor. The failures appeared to be the result of: bank exfiltration, antecedent moisture conditions preceding the event, and the historic development of the channel. Using one-dimensional hydraulic modelling to delineate geomorphic features within the main boundary of the macrochannel, an estimated 1 466 322m2 of erosion was interpreted as fluvial entrainment, occurring across catchment areas from 30 to 1668 km2. Only 8% of the whole riverbank planform area was occupied by mass failures, whilst fluvial entrainment covered 33%. A third of the volume of material eroded came from mass failures, even though they occupied 19% of the eroded bank area. The availability of repeat LiDAR surveys, combined with high-resolution aerial photography, was very effective in erosion process determination and quantification at a large spatial scale
Keyword Bank erosion
Mass failures
Wet flows
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
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Created: Wed, 26 Nov 2014, 13:41:52 EST by Helen Smith on behalf of School of Geography, Planning & Env Management