A Comparative Study of Suspended Sediment Concentrations Observed With Acoustic and Optical Methods
HU Jie
XU Ji-shang
NIU Jian-wei
DONG ping
QIN Kuan-kuan
Abstract：Based on the principle of the estimation of suspended sediment concentration (SSC)by using optical backscatter sensor(OBS)and acoustic backscatter sensor(ABS), the suspended sediment concentrations have been measured and recorded by using OBS instrument ASM-IV and ABS instrument AQUAscat1000 under the conditions of high sediment concentration and different wave conditions in a water flume lab.Both the OBS and the ABS measurements are first calibrated with the water samples collected during the water flume experiments and then inverted to obtain the vertical SSC profiles with high accuracy.The results show that the turbidity and the SSC determined with differ-ent optical probes of ASM-IV can be described with the same linear relationship,with a correlation coefficient being as high as 0.996,indicating that the vertical SSC profile can possibly be inverted with a high accuracy (vertical interval 1 cm).For the silty bottom and wave conditions in the present flume experiment,the detection accuracy is lower with the ABS instrument than with the OBS instrument.The values measured by using the acoustic transducers with different frequencies can vary over several orders of magni-tude,and the correlation coefficients between the inverted and the measured SSC values vary from 0.716 to 0.974.
Keywords：multi OBS arraymulti-frequency ABSSSCvertical SSC profile
Publication Date：2016-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：11( 47-57 )