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Streamflow characteristics of northeastern Tasmania: II. Hydraulic geometry


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Knighton, AD 1987 , 'Streamflow characteristics of northeastern Tasmania: II. Hydraulic geometry' , Papers and Proceedings of the Royal Society of Tasmania, vol. 121 , pp. 125-135 .

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Relationships describing the adjustment of water-surface width, mean depth and mean velocity to increasing
discharge are calculated for eleven sections in northeastern Tasmania. The at-a-station graphs of two sections display
distinct discontinuities related, however, to different causes - sub-bankfull channelization and the attainment of
overbank stage. Despite intra-reach and inter-fluvial variations in hydraulic geometry, two types of response seem to be
dominant, characterised by a high rate of change of either depth or velocity. Two sections do not fit into this pattern and,
significantly, they tend to plot poorly on downstream graphs.
Bankfull discharge probably lies between Q 1.11 and Q2 at most sites, so both flows are used as reference discharges
in analyses of downstream adjustment at the regional scale. The relations at Ql.ll and Q2 are quite similar and they are
within the envelope defined by results from other areas. However, the data base is small and the scatter is large enough to
render the velocity-discharge relation non-significant. The main residual from regression is the station on the South Esk
at Perth which is used for discharge measurements at higher flows. Nevertheless, the hydraulic geometry equations
enable estimates to be made of channel flow properties at ungauged sites within the northeastern river system.

Item Type: Article
Authors/Creators:Knighton, AD
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
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Copyright Royal Society of Tasmania

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