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Alice Springs recreational dam hydrology report project 6



Alice Springs recreational dam hydrology report project 6


Jackson, D.; Paige, D.


E-Publications; E-Books; PublicationNT; Report no. 12/1979







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Northern Territory Government

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Report no. 12/1979

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Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



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Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 132 of 153. I I I I I I I I I I I I I I I I 34 2 DATA 2.1 Introduction FieJ~ ~ata is very sparse~ Suspended load measurements were made on two floods in March 1965 and on three floods in early 1979. All measurements were taken at G.S. 006009. One measurement of bed load was made in 1979. Permanent ranges have been estabiished between G.S. 006126 and the dam site for long term monitoring of large scale changes in channel morphology. The locations of the cross-sections are shown in figure 1. Throughout the sediment section of this report a distinction is made between suspended sediment and bed load . . SuspendQd sediment consists of fine particles, typically having a particle diameter less than 0.06 mm. In the Todd catchment most fine particles would be classified as silt with a small proportion (10%) of clays. Bed load comprises larger particles which move along the river bed by saltation or rolling. An individual bed particle alternates between being at rest and in motion on a random basis. At any observation, the overall impression is one of net particle transport although individual particles may have changed from a moving to a rest state or vice-versa during the observation. A distinction should also be made between sediment transport capacity and the actual sediment load. Transport capacity is a measure of the sediment that could be transported for a given river section and flow rate and assumes that the sediment source can adequately supply sediment at the rate of transport. In fact, the actual sediment load can be less than the transport capacity because of an inadequate supply of sediment. The rate of suspended sediment transport is very dependent on the availability of fine particles within the catchment. On an alluvial river bed where there exists a large source of bed load material, sediment transport capacity is a reasonable estimate of actual bed load. Total sediment load comprises both suspended load and bed load.

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