Baseline survey of fluvial geomorphology and hydrology of Pipers River. Report prepared for the Tamar Natural Resource Management Strategy
Ellison, JC and Bester, C and Arkley, K and Dell, G and Holland, S and Clark, M and Hannaford, R and Taylor, E and Atkins, C and Foster, I and Morrison, B (2002) Baseline survey of fluvial geomorphology and hydrology of Pipers River. Report prepared for the Tamar Natural Resource Management Strategy. Technical Report. University of Tasmania, Hobart.
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Official URL: http://www.tamar-nrm.org.au/pages/frames/reports/reports_fr.html
There were three primary aims of this geomorphological assessment of the Pipers River.
First, to evaluate hydraulic flow characteristics of the Pipers River at bankfull discharge.
These are the conditions under which channel processes are most active, and channel
erosion or avulsion can occur. Second, to describe downstream changes in particle shape
and type of stream bed material, and third, to provide a baseline survey that can be
repeated in future for quantitative identification of change.
Three sites were assessed at representative sections of Pipers River. Site 1 was located
just north of Underwood at 250 meters elevation and within a topographically steep
landscape. Site 2 was located at Colgrave road, about 14 km north of site 1 at an
elevation of 65 meters. Site three was east of Baxter road, further 8 km north from site 2,
c. 11 km south from Pipers Head and at an elevation of c. 40 meters.
The river at site 1 (Underwood) was found to be stable, with establishing riparian
vegetation, and unlikely to erode. The river at site 2 was found to be unstable, caused by
channel incision and expansion, leading to increased bankfull discharge and capability for
erosion. This was exacerbated by large woody debris in the channel, in positions that
cause bank scour. The river at site 3 was found to be unstable, caused by reduced
bankfull discharge, and consequent bed aggradation, which has lead to channel avulsion.
This was also contributed to by willow infestation of the channel, and stock access to the
There are specific recommendations from this field assessment to improve conditions at
sites 2 and 3, including willow removal, riparian fencing, riparian revegetation, and
rivercare assessment of the orientation of large woody debris at site 2, and the channel
avulsion exit at site 3. It is further recommended that this survey be repeated in future for
quantiative evaluation of changer, either after any major works (upstream or on-site), or
every 5 years.
|Item Type:||Report (Technical Report)|
|Deposited By:||Dr Joanna Ellison|
|Deposited On:||16 Feb 2009 13:42|
|Last Modified:||16 Feb 2009 13:42|
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