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Geomorphology report on coastal erosion at the Detention River estuary, Hellyer, North West Tasmania


Ellison, JC and White, ME and Poole, MD and Beasy, KM and McNab, SLP and Walford, H, Geomorphology report on coastal erosion at the Detention River estuary, Hellyer, North West Tasmania, Crown Land Services Branch, Depatment of Primary Industries, Parks, Water and Environment, 1 (2010) [Consultants Report]

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Copyright © 2010 Staff and Students of the School of Geography and Environmental Studies, University of Tasmania

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The western bank of the Detention River estuary has in the last few years suffered erosion owing to the active estuarine channel meandering to the west. The main estuarine channel was located in the centre of the estuary from 1971 to 1997 at least, and has moved west after 2004 following increased sand deposition in the mouth. Human activity in the area is further exacerbating the erosion problem, and fallen trees also contribute to sediment erosion. Erosion at this site is not primarily caused by rise in sea-level, though it exemplifies the types of impacts that widespread coastal areas in Tasmania will experience in coming decades. Recommendations to mitigate this erosion problem must be agreed by stakeholders involved, and options include restriction of public access, further removal of large woody debris at the base of the erosion scarp, increasing the sheer strength of the erosion bank by control of runoff and revegetation, and boat wake restriction in the estuary. These actions would all decrease erosive forces at the site. Subject to EIA approval and supervision by a hydraulic engineer this geomorphologists’ report can also support the option of reconstruction of the central estuary main channel at its position around 1988 to 1997, to relieve flow at the erosion site. This might include the option of subsequent beach replenishment of the erosion site, though involving no hard structures. Further investigation particularly including GIS analysis and site monitoring should also be carried out.

Item Details

Item Type:Consultants Report
Keywords:coatal erosion, sea level rise, remediation, climate change effects on coastal sites
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Environmental management
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal and estuarine systems and management not elsewhere classified
UTAS Author:Ellison, JC (Associate Professor Joanna Ellison)
UTAS Author:White, ME (Ms Margaret White)
UTAS Author:Poole, MD (Mr Michael Poole)
UTAS Author:Beasy, KM (Dr Kim Beasy)
UTAS Author:McNab, SLP (Ms Sarah McNab)
UTAS Author:Walford, H (Ms Hannah Walford)
ID Code:64481
Year Published:2010
Deposited By:Geography and Environmental Studies
Deposited On:2010-08-04
Last Modified:2010-08-17

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