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Bedload yields for sand-bed streams in the Ngarradj Creek catchment, Northern Territory, Australia

Erskine, Wayne D. and Saynor, Mike J. (2015). Bedload yields for sand-bed streams in the Ngarradj Creek catchment, Northern Territory, Australia. Hydrological Processes,29(17):3767-3778.

Document type: Journal Article
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IRMA ID 75039815xPUB998
Title Bedload yields for sand-bed streams in the Ngarradj Creek catchment, Northern Territory, Australia
Author Erskine, Wayne D.
Saynor, Mike J.
Journal Name Hydrological Processes
Publication Date 2015
Volume Number 29
Issue Number 17
ISSN 0885-6087   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-84938748456
Start Page 3767
End Page 3778
Total Pages 12
Place of Publication United Kingdom
Publisher John Wiley & Sons Ltd.
Field of Research ENVIRONMENTAL SCIENCES
HERDC Category C1 - Journal Article (DIISR)
Abstract Bedload yields were calculated by 39 methods at the East Tributary gauge, nine methods at Upper Swift Creek gauge and 11 methods at Swift Creek gauge in the Ngarradj Creek catchment in northern Australia. These methods involved combining various significant bedload rating curves determined for a measured bedload data set for a 4-year period with either the hourly or daily hydrographs or flow duration curves for the same period, 1 September 1998 to 31 August 2002. Bedload ratings were both statistically significant (ρ ≤ 0.05) and explained at least 60% of the variance in bedload flux. Bias corrections were used with all methods based on log10-transformed ratings. Estimated mean annual bedload yields varied by three orders of magnitude at the East Tributary gauge and by two orders of magnitude at Upper Swift Creek and Swift Creek gauges. Hourly discharges usually produced higher estimated yields than daily discharges. The bedload rating-flow duration curve technique overestimates yields and bias correction methods always produce even higher yields. Ratings using both immersed bedload weight and adjusted immersed bedload weight always under-predicted yields because they contain an implicit threshold of motion condition that is at least four times greater than that predicted by Bagnold's threshold equation. Such a result questions the applicability of Bagnold's threshold equation to the Ngarradj Creek catchment. The best estimates of mean annual bedload yield at East Tributary, Upper Swift Creek and Swift Creek gauges are 600 ± 170 (SE), 1065 ± 150 and 1795 ± 270 t/year, respectively.
DOI http://dx.doi.org/10.1002/hyp.10456   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Tue, 26 Jul 2016, 12:37:01 CST