Study of the measurement of suspended sediment concentration based on pulse-coherent acoustic doppler profiler observation

In order to investigate the suitability of using pulse-coherent acoustic Doppler profiler(PCADP) to estimate suspended sediment concentration(SSC),the acoustic backscatter intensity was corrected for spreading and absorption losses,then calibrated with OBS,finally converted to SSC.The results show that there is good correlation with R equal to 0.74 between SSC and backscatter intensity.The mean relative error is 22.4%.Then the time span of little particle size variation was analyzed to exclude the influence of size variation.The correlation improves with R equal to 0.81 and the error decreases to 18.9%.It can be seen that PCADP estimating SSC can reach the requirement of professional instruments with the precision of 20% to 50%,and can meet the need of dynamics study.