Using turbidity and acoustic backscatter intensity as surrogate measures of suspended sediment concentration in a small subtropical estuary

Chanson, Hubert, Takeuchi, Maiko and Trevethan, Mark (2008) Using turbidity and acoustic backscatter intensity as surrogate measures of suspended sediment concentration in a small subtropical estuary. Journal of Environmental Management, 88 4: 1406-1416.

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Author Chanson, Hubert
Takeuchi, Maiko
Trevethan, Mark
Title Using turbidity and acoustic backscatter intensity as surrogate measures of suspended sediment concentration in a small subtropical estuary
Journal name Journal of Environmental Management   Check publisher's open access policy
ISSN 0301-4797
Publication date 2008-09
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jenvman.2007.07.009
Volume 88
Issue 4
Start page 1406
End page 1416
Total pages 11
Place of publication United Kingdom
Publisher Academic Press
Collection year 2008
Language eng
Subject 290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
260400 Oceanography
260500 Hydrology
09 Engineering
0905 Civil Engineering
Abstract The suspended sediment concentration is a key element in stream monitoring, although the turbidity and acoustic Doppler backscattering may be suitable surrogate measures. Herein a series of new experiments were conducted in laboratory under controlled conditions using water and mud samples collected in a small subtropical estuary of Eastern Australia. The relationship between suspended sediment concentration and turbidity exhibited a a linear relationship, while the relationships between suspended sediment concentration and acoustic backscatter intensity showed a monotonic increase. The calibration curves were affected by both sediment material characteristics and water quality properties, implying that the calibration of an acoustic Doppler system must be performed with the waters and soil materials of the natural system. The results were applied to some field studies in the estuary during which the acoustic Doppler velocimeter was sampled continuously at high-frequency. The data yielded the instantaneous suspended sediment flux per unit area in the estuarine zone. They showed some significant fluctuations in instantaneous suspended mass flux, with a net upstream suspended mass flux during flood tide and net downstream sediment flux during ebb tide. For each tidal cycle, the integration of the suspended sediment flux per unit area data with respect of time yielded some net upstream sediment flux in average.
Keyword Turbidity
Acoustic backscatter intensity
Suspended sediment concentration SSC
Subtropical estuary
High-frequency suspended sediment flux
Acoustic Doppler velocimeter ADV
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Sub-type: Article (original research)
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Created: Mon, 21 Jul 2008, 16:38:33 EST by Hubert Chanson on behalf of School of Civil Engineering