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Continuous measurement of suspended-sediment discharge in rivers by use of optical backscatterance sensors

IAHS-AISH Publication

By:
and
Edited by:
J. Bogen, T. Fergus, and D. Walling

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Abstract

Optical sensors have been used to measure turbidity and suspended-sediment concentration by many marine and estuarine studies, and optical sensors can provide automated, continuous time series of suspended-sediment concentration and discharge in rivers. Three potential problems with using optical sensors are biological fouling, particle-size variability, and particle-reflectivity variability. Despite varying particle size, output from an optical backscatterance sensor in the Sacramento River at Freeport, California, USA, was calibrated successfully to discharge-weighted, cross-sectionally averaged suspended-sediment concentration, which was measured with the equal discharge-, or width-increment, methods and an isokinetic sampler. A correction for sensor drift was applied to the 3-year time series. However, the calibration of an optical backscatterance sensor used in the Colorado River at Cisco, Utah, USA, was affected by particle-size variability. The adjusted time series at Freeport was used to calculate hourly suspended-sediment discharge that compared well with daily values from a sediment station at Freeport. The appropriateness of using optical sensors in rivers should be evaluated on a site-specific basis and measurement objectives, potential particle size effects, and potential fouling should be considered.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Continuous measurement of suspended-sediment discharge in rivers by use of optical backscatterance sensors
Series title:
IAHS-AISH Publication
Issue:
283
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
IAHS-AISH Publication
First page:
28
Last page:
36
Conference Title:
Erosion Sediment Transport Measurement in Rivers: Techlogical and Methodological Advances
Conference Location:
Oslo
Conference Date:
19 June 2002 through 21 June 2002