NDLI: Effects of suspended sediment concentration and grain size on three optical turbidity sensors

Content Provider	Springer Nature Link
Author	Merten, Gustavo Henrique Capel, Paul D. Minella, Jean P. G.
Copyright Year	2013
Abstract	Optical turbidity sensors have been successfully used to determine suspended sediment flux in rivers, assuming the relation between the turbidity signal and suspended sediment concentration (SSC) has been appropriately calibrated. Sediment size, shape and colour affect turbidity and are important to incorporate into the calibration process.This study evaluates the effect of SSC and particle size (i.e. medium sand, fine sand, very fine sand, and fines (silt + clay)) on the sensitivity of the turbidity signal. Three different turbidity sensors were used, with photo detectors positioned at 90 and 180 degrees relative to the axis of incident light. Five different sediment ratios of sand:fines (0:100, 25:75, 50:50, 75:25 and 100:0) were also evaluated for a single SSC (1000 mg l$^{-1}$).The photo detectors positioned at 90 degrees were more sensitive than sensor positioned at 180 degrees in reading a wide variety of grain size particles. On average for the three turbidity sensors, the sensitivity for fines were 170, 40, and 4 times greater than sensitivities for medium sand, fine sand, and very fine sand, respectively. For an SSC of 1000 mg l$^{-1}$ with the treatments composed of different proportions of sand and fines, the presence of sand in the mixture linearly reduced the turbidity signal.The results indicate that calibration of the turbidity signal should be carried out in situ and that the attenuation of the turbidity signal due to sand can be corrected, as long as the proportion of sand in the SSC can be estimated.
Starting Page	1235
Ending Page	1241
Page Count	7
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	14
Issue Number	7
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical sensor Scattered light Sediment flux Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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