Research Papers

Light backscattering in turbid freshwater: a laboratory investigation

[+] Author Affiliations
Felipe L. Lobo

University of Victoria, Department of Geography, Spectral Lab, Social Sciences and Mathematics Building, Room B203, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada

Maycira Costa, Stephen Phillips, Erika Young, Cory McGregor

University of Victoria, Department of Geography, Spectral Lab, Social Sciences and Mathematics Building, Room B203, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada

J. Appl. Remote Sens. 8(1), 083611 (Jun 25, 2014). doi:10.1117/1.JRS.8.083611
History: Received October 28, 2013; Revised May 8, 2014; Accepted May 27, 2014
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Abstract.  The relationship between backscattering and inorganic sediment concentration was examined in a controlled laboratory setting. Different concentrations of two sediment sizes (clay/silt and medium sand) of marine clay deposition were added separately in an opaque black tank containing 500 l of distilled water. The experiment used two optical Environmental Characterization Optics-Backscattering sensors to quantify backscattering in m1 and NTU. Increasing backscatter coefficients (maximum 5.3m1) were observed with increasing suspended particulate concentrations up to 272 and 412mgl1 for clay/silt and medium sand, respectively. This demonstrates that a greater range of backscattering values can be measured for highly turbid waters than previously measured in situ. Mass-specific backscattering values for clay/silt (0.02m2g1) are on average higher than for medium sand (0.014m2g1). Although the backscattering ratio [b˜bp(λ)] and refractive index calculated are in accordance with the literature, it is worth noting that the difference in particle size does not exclude differences in matter composition, shape, and other physical factors that contribute to b˜bp variation. The results suggest that further investigation of inorganic optical properties affecting particle size as well as matter composition is required in a controlled environment.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Felipe L. Lobo ; Maycira Costa ; Stephen Phillips ; Erika Young and Cory McGregor
"Light backscattering in turbid freshwater: a laboratory investigation", J. Appl. Remote Sens. 8(1), 083611 (Jun 25, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.083611


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