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River stability issues in Northern Australia

Valentine, Eric M. (2006). River stability issues in Northern Australia. In: 30th Hydrology and Water Resources Symposium, Launceston, 4-7 December 2006.

Document type: Conference Paper
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Author Valentine, Eric M.
Title River stability issues in Northern Australia
Conference Name 30th Hydrology and Water Resources Symposium
Conference Location Launceston
Conference Dates 4-7 December 2006
Conference Publication Title Proceedings of the 30th Hydrology and Water Resources Symposium: Past, Present and Future
Place of Publication Sandy Bay, Tas.
Publisher Conference Design
Publication Year 2006
ISBN 0-8582579-0-4   (check CDU catalogue open catalogue search in new window)
Start Page 568
End Page 575
Total Pages 8
Field of Research 0406 - Physical Geography and Environmental Geoscience
HERDC Category E5 - Conference Publication - Refereed without National or International significance (internal)
Abstract The Northern Territory Government plans to convert pastoral leases in the Daly River region to agriculture. Prior to this development it is important to understand the sediment dynamics of the system and the potential impacts on the river of water abstraction for irrigation. The Daly River is one of the iconic river systems of northern Australia. There is considerable debate about the effects that potential development of the river basin may have on the river channel. It has been suggested that there has been considerable siltation in the estuary since 1880, and recent observations of the channel indicate that there are instabilities in the channel plan-form. The question as to whether these instabilities are driven by hydrological or anthropogenic influences is crucial to the decision on future development and how it should be managed. This paper proposes the application of rational regime techniques to alluvial reaches of the Daly River to help determine if the channel dimensions are in equilibrium or are being subjected to a change from a previous equilibrium state. Considerable work has been carried out in idealised laboratory free-form channels to investigate and test rational regime approaches. However, much less has been done to apply these methods to field conditions. There are several reasons for this. For example, the argument about the so-called channel-forming discharge, the scepticism that such systems may yield to a pseudo-deterministic approach, and the fact that to solve the equations which describe the system, an extremal hypothesis has to be applied with little theoretical justification.
Keyword Fluvial hydraulics
River stability
Sediment transport
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Created: Fri, 12 Sep 2008, 08:35:25 CST by Administrator