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Turbidity Meter Calibrations Based on Grain Size Distribution of Trapped Suspended Material  

조홍연 (한국해양연구원 연안·항만공학연구본부)
김백운 (한국해양연구원 연안·항만공학연구본부)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.15, no.1, 2003 , pp. 33-38 More about this Journal
Abstract
Turbidity meter calibrations were conducted using bottom sediment and suspended material collected with a vertical array of sediment traps at the coastal water off Gaduk Island. Compared to the bottom sediment comprising sand fraction of approximately 6％, trapped suspended material was composed entirely of silt and clay fractions and showed a tendency to get finer as elevation from the sea-bed increases. Slope parameter of linear regression due to bottom sediment was of minimum value and values of those due to suspended material increased gradually as the height of sediment trap increases (i.e., sediment size decreases). This result shows that turbidity meter calibration using bottom sediment can cause an overestimation error in the calculation of suspended sediment concentration and that the error can reach up to 25% in case of this study. Therefore, it is suggested that the use of a corrected calibration curve based on grain size distribution of suspended material instead of bottom sediment may reduce the measurement error of suspended sediment concentration.
Keywords
turbidity meter calibration; sediment trap; suspended material; grain size distribution; calibration curve;
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