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Hillslope erosion and post-fire sediment trapping at Mount Bold, South Australia

TitleHillslope erosion and post-fire sediment trapping at Mount Bold, South Australia
Publication TypeConference Proceedings
Year of Conference2012
AuthorsMorris, R, Dragovich, D, Ostendorf, B
Conference NameWildfire and Water Quality: Processes, Impacts and Challenges
Date PublishedJune 2012
Conference LocationBanf, Canada
AbstractSuccessful placement of sediment traps requires an understanding of how hillslope morphology influences erosion. Following the 2007 Mount Bold wildfire, in South Australia, a 1 in 5 year rainfall event resulted in the failure of many sediment traps due to substantial sediment movement within the reservoir reserve. This study assesses how hillslope morphology can influence post-fire surface erosion and the subsequent appropriate placement of sediment traps. Erosion pins and sediment traps were used at five different sites to measure hillslope surface change and trapped sediment volumes. Terrestrial laser scanning was used to model surface change where slope gradients are 1:2 or greater. Surface change was assessed in relation to slope gradient, slope length, cross-slope curvature, hillslope position and fire severity. The results suggested a threshold for substantial increased sediment yield at slope gradients of 1:2. The findings also suggested that concave cross-slope curvatures were associated with significantly larger amounts of sediment movement.
URLhttp://www.iahs.info/redbooks/a354/iahs_354_0042.pdf
Refereed DesignationRefereed

Published Works

Publication Type

Conference Proceedings

Conference Proceedings

Publication Year

Year of Conference 2012