Tridisma: An EU program for utilizing acoustics for measuring suspended sediment processes [abstract of paper presented at Joint 140th Meeting ASA/NOISE-CON 2000]

Thorne, P.D., Taylor, J.J., Humphrey, V.F. and Vincent, C.E. (2000) Tridisma: An EU program for utilizing acoustics for measuring suspended sediment processes [abstract of paper presented at Joint 140th Meeting ASA/NOISE-CON 2000]. Journal of the Acoustical Society of America, 108 (5 , Part 2), p.2615. (doi:10.1121/1.4743731).

Abstract

In this paper the application of high-frequency acoustic remote sensing is discussed with respect to the development of an instrument capable of resolving the dynamics of the benthic boundary layer, in response to the interaction of waves and currents, using sound backscattered by the sediments entrained by the flow. Within the TRIDISMA project an acoustic instrument has been developed which combines three distinct approaches to the analysis of backscattered signals in order to extract information on flow structure and the response of the sediment bed to the overlying flow. The TRIDISMA instrument combines pulse coherent Doppler and acoustic cross-correlation techniques to the problem of extracting profiles of velocity, while the amplitude of the backscattered signal measured at three frequencies is used to investigate the response of the suspension field in terms of both size and concentration profiles. In the present paper we describe the hardware and software architecture of the prototype instrument and demonstrate the systems capabilities with results obtained from flume studies of waves, currents, and combined flows.

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