Using turbidity and acoustic backscatter intensity as surrogate measures of suspended sediment concentration in a small subtropical estuary.
J Environ Manage
; 88(4): 1406-16, 2008 Sep.
Article
en En
| MEDLINE
| ID: mdl-17716809
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 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.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Acústica
/
Sedimentos Geológicos
/
Nefelometría y Turbidimetría
País/Región como asunto:
Oceania
Idioma:
En
Revista:
J Environ Manage
Año:
2008
Tipo del documento:
Article
País de afiliación:
Australia
Pais de publicación:
Reino Unido