Territory Stories

Alice Springs recreational dam hydrology report project 6

Details:

Title

Alice Springs recreational dam hydrology report project 6

Creator

Jackson, D.; Paige, D.

Collection

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

Date

1979-10-01

Notes

Date:1979-10

Language

English

Publisher name

Northern Territory Government

Place of publication

Darwin

Series

Report no. 12/1979

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/228346

Citation address

https://hdl.handle.net/10070/674275

Page content

Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 134 of 153. I I I I I I I I I I I I I I I I I I I 35 2.2 Suspended Sediment The arid nature of the Todd Catchment in conjuwtion with grazing as its land use suggests that small diameter suspended sediment transport rates will be high. The measurements of suspended sediment in 1965 and 1979 were both made during climatically extreme periods. The 1965 water year recorded the second lowest rainfall onrecord and was preceded by the third lowest rainfall in 1965. In addition, 1965 was the last year of a continuous nine year period of below average rainfalls which was the worst drought on record. In contrast the 1979 water year occurs at the end of a seven year period of above average rainfalls and is the wettest period on record. Suspended sediment mass flow rates from samples taken at Wills Terrace are plotted against discharge at G.S. 006009 in figure 2. All measurements were Rade on the falling stage of the hydrograph. No analysis of suspended sediment particle made. 2.3 Bed Load size was One bed load measurement of 650g/s at a discharge of 10m 3 /s was made at G.S. 006009 on 4/3/79. This represents 30% of suspended load or 25% of total load. Estimates of the bed load transport rate at Wills Terrace were made using the Meyer-Peter/Muller formula (Simons and Senturk, 1977). These estimates are sensitive to stream slope values. Stream slopes can be estimated either by assuming a constant Mannings In' value and using Mannings equation for uniform steady flow or by approximating the 'bed sloper to the 'stream slope'. An 'n' value of 0.035 was used in calculating bed load transport at Wills Terrace. Bed load transport estimates made for a cross-section downstream of Wills Terrace using alternative formulae (Cameron McNamara 1978) and the estimates for bed load transport at Wills Terrace are shown in figure 2.


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