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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







Publisher name

Northern Territory Government

Place of publication



Report no. 12/1979

File type



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 54 of 153. I I I I I I I I I I I I I I I I I I I I 33 1. INTRODUCTION The damming of the Todd River at the Old Telegraph Station will result in two sediment related effects. Upstream of the dam, sediment will deposit in the reservoir~ gradually decreasing the useable reservoir area and volume. In contrast the river bed downstream of the dam will scour. Both effects are due to the perturbation of a steady state system by the construction of a dam. Sediment transport is a complex function of hydraulic and fluid variables, channel geometry and sed"iment properties. C~nceptually the river is considered to be in an equilibrium state before dam construction, with all the interacting variables being compatible. Following dam construGtion, one or more of these variable will change arId the equilibrium between variables is upset. To achieve the new steady state in which the system is compatible with modified conditions, changes will occur in other variables such as bed elevation and channel width. The aim of this sediment study was to look atthese upstream and downstream effects and specifically to examine: 1) the effect of silting on the useful life of the reservoir. 2) the effect of the dam on downstream channel morphology.

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