DocumentCode :
2955931
Title :
Simultaneous measurements of high resolution vertical and horizontal flow profiles and suspended sediments using acoustic backscattering
Author :
Hardcastle, J. ; Thorne, P.D.
Author_Institution :
Proudman Oceanogr. Lab., UK
fYear :
1997
fDate :
23-25 Jun 1997
Firstpage :
100
Lastpage :
106
Abstract :
Acoustic backscatter systems have many advantages in suspended sediment studies, in particular they are non intrusive, and are capable of giving profile measurements with high temporal and spatial resolution. In the present work, which was conducted in an estuary, further advances have enabled the use of high resolution coherent Doppler current profilers to measure the vertical and horizontal flow structure, and acoustic correlation techniques have been developed to measure vertical profiles of horizontal velocities. Typically the measurements from the Doppler systems gave results at sampling frequencies up to 16 Hz, over ranges of the order of a metre with centimetric resolution. In this work the data from the correlation method was only used to derive mean flow. Further work will be carried out to determine the upper frequency limit of the method which will depend on the decorrelation time between the backscattered signals. The acoustic backscatter signals from the systems have been converted to provide suspension concentration profiles and combined with the flow measurements to provide a more complete description of the dynamics of the interactions between the water and sediment, and the structural dimensions
Keywords :
oceanographic techniques; acoustic backscattering; acoustic correlation; coast; current; decorrelation time; dynamics; estuary; flow; high resolution coherent Doppler current profiler; horizontal flow; measurement technique; ocean; sonar; suspended sediment; suspension concentration; turbidimetry; turbidity; vertical profile;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Electronic Engineering in Oceanography, 1997. Technology Transfer from Research to Industry., Seventh International Conference on
Conference_Location :
Southampton
ISSN :
0537-9989
Print_ISBN :
0-85296-689-X
Type :
conf
DOI :
10.1049/cp:19970669
Filename :
612635
Link To Document :
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