KOPRI Repository

Estimation of high-resolution sediment concentration profiles in bottom boundary layer using pulse-coherent acoustic Doppler current profilers

Cited 43 time in wos
Cited 48 time in scopus
Title
Estimation of high-resolution sediment concentration profiles in bottom boundary layer using pulse-coherent acoustic Doppler current profilers
Other Titles
음향도플러유속계를 이용한 경계층내의 고해상도 부유물질 농도 측정
Authors
J.P.-Y Maa
Ha, Ho Kyung
Y.H. Kim
K. Park
Subject
GeologyOceanography
Keywords
ADCPbackscatterbottom boundary layerpulse-coherentsuspended sediment concentrati
Issue Date
2011
Publisher
Elsevier
Citation
J.P.-Y Maa, et al. 2011. "Estimation of high-resolution sediment concentration profiles in bottom boundary layer using pulse-coherent acoustic Doppler current profilers". MARINE GEOLOGY, 279(1-4): 199-209.
Abstract
The capability of two acoustic profilers ?SonTek's 1.5-MHz pulse-coherent acoustic Doppler profiler (PC-ADP) and RDI's 600-kHz acoustic Doppler current profiler (ADCP) with pulse-coherent mode ?was evaluated for estimating high-resolution suspended sediment concentration (SSC) profiles in bottom boundary layer. In the laboratory measurements with a PC-ADP, two types of sediments were tested to study acoustic responses to grain size. A natural sediment sample from Clay Bank, a mixture of clay and very fine sand, showed a good linear relationship between range-corrected volume scattering ( ) and backscattered strength (E) until SSC increased up to about 10 g l-1. In contrast, a commercially available kaolinite exhibited earlier signal saturation and non-unified linear regressions between and E, most likely because the particle size is much smaller than the transmitted acoustic wavelength. Using a pulse-coherent ADCP, the field measurement results from Mobile Bay, Alabama showed that the acoustically-derived SSC profiles were well matched with the optically-derived outcomes although slight discrepancies were noted. The overestimation of acoustically-derived SSC near the bed may be related to the side lobe interference near the bed and the enhanced acoustic sensitivity by coarser particles and denser aggregates eroded from the bed. Mean absolute error of acoustic estimates was within 4.1?7.3% of the optically-derived SSC range, which is attributable to the different acoustic and optical scattering responses to given sediment size spectra. Despite some error sources in acoustic inversion, the results from laboratory and field experiments suggest that the pulse-coherent acoustic profiler is able to reveal the evolution of in-situ near-bed SSC profiles with high vertical and temporal resolution.
URI
https://repository.kopri.re.kr/handle/201206/5756
DOI
http://dx.doi.org/10.1016/j.margeo.2010.11.002
Type
Article
Indexed
SCI
Appears in Collections  
2010-2011, Acoustic and Optical Responses to Suspended Material in the Polar Oceans (10-11) / Ha, Ho Kyung (PE10260)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse