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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

Place of publication



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 136 of 153. I I I I I I I I I I I I I I I I I I 36 Bed load tranSDort in the channel section immediately uostream of th~ reservoir was estimated using the M~yer - Peter/Muller formula with the bed slope approximation and is also shown in fiqure 2. Because of the steeper channel slope in this section, the bed load transport rate is much higher than the rate at Wills Terrace. Assuming that transport rate is at transport capacity, the high rate upstream of the dawsite suggests that in order to maintain continuity of sediment, bed load material is being stored between the two sections. In fact the Todd River undergoes a distinct change in channel morphology at the damsite. The river bed changes from a shallow sandy, rocky, low storage channel to a deep sand, high storage channel. Bed samples were taken at third points for cross section ranges upstream from wills Terrace. Figures 3 and 4 show the range of particle sizes of samples taken at the surface and 1m depth respectively. Samples taken at 1w depth are coarser than surface samples i.e.: 1.Om depth Bed surface DSO = 1.lmm D50 = O.7Smm D90 = 7mm D90 = 3mm There is no evidence of particle size sorting between cross-sections downstream from the dam.

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