Dolcetti, G. orcid.org/0000-0002-0992-0319 and Krynkin, A. (2017) Doppler spectra of airborne ultrasound forward scattered by the rough surface of open channel turbulent water flows. Journal of the Acoustical Society of America, 142. 3122. ISSN 0001-4966
Abstract
Experimental data are presented on the Doppler spectra of airborne ultrasound forward scattered by the rough dynamic surface of an open channel turbulent flow. The data are numerically interpreted based on a Kirchhoff approximation for a stationary random water surface roughness. The results show a clear link between the Doppler spectra and the characteristic spatial and temporal scales of the water surface. The decay of the Doppler spectra is proportional to the velocity of the ow near the surface. At higher Doppler frequencies the measurements show a less steep decrease of the Doppler spectra with the frequency compared to the numerical simulations. A semi-empirical equation for the spectrum of the surface elevation in open channel turbulent flows over a rough bed is provided. The results of this study suggest that the dynamic surface of open channel turbulent flows can be characterized remotely based on the Doppler spectra of forward scattered airborne ultrasound. The method does not require any equipment to be submerged in the flow and works remotely with a very high signal to noise ratio.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N029437/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Nov 2017 09:48 |
Last Modified: | 29 Oct 2018 09:27 |
Published Version: | https://doi.org/10.1121/1.5011183 |
Status: | Published |
Publisher: | Acoustical Society of America |
Refereed: | Yes |
Identification Number: | 10.1121/1.5011183 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:124046 |