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Imaging wooden artefacts using Chirp sources

Imaging wooden artefacts using Chirp sources
Imaging wooden artefacts using Chirp sources
This paper investigates the potential for imaging submerged and buried wooden artefacts in the marine environment using high-resolution seismic reflection techniques. Models to calculate theoretical reflection coefficients of 11 wood species buried in shallow marine sediments are developed. The models use estimates of acoustic impedance contrasts to predict the strength of reflections resulting from buried wooden artefacts. Traditionally, wooden wrecks are composed of oak, with lesser components of mahogany, pine and elm. Experimental results on wood samples from a sixteenth century oak wreck (the Mary Rose) are presented as a control on theory.
Results indicate that wooden wrecks may be readily imaged by a suitable sub-bottom profiler operating under appropriate survey conditions. Particular reference is made to Chirp sonar which transmits a frequency-modulated pulse, providing high-resolution digital seismic data. Chirp data acquired over an eighteenth century buried oak wreck (the Invincible, Horsetail, East Solent) is presented. Calculations of reflection coefficients acquired over the site support both the theoretically and experimentally derived data.
wood, shipwreck, reflection seismology, Chirp
1075-2196
25-35
Quinn, R.
a5ae0628-5870-46da-81a6-8d4eff3b3270
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Quinn, R.
a5ae0628-5870-46da-81a6-8d4eff3b3270
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Dix, J.K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628

Quinn, R., Bull, J.M. and Dix, J.K. (1997) Imaging wooden artefacts using Chirp sources. Archaeological Prospection, 4 (1), 25-35. (doi:10.1002/(SICI)1099-0763(199703)4:1<25::AID-ARP66>3.0.CO;2-U).

Record type: Article

Abstract

This paper investigates the potential for imaging submerged and buried wooden artefacts in the marine environment using high-resolution seismic reflection techniques. Models to calculate theoretical reflection coefficients of 11 wood species buried in shallow marine sediments are developed. The models use estimates of acoustic impedance contrasts to predict the strength of reflections resulting from buried wooden artefacts. Traditionally, wooden wrecks are composed of oak, with lesser components of mahogany, pine and elm. Experimental results on wood samples from a sixteenth century oak wreck (the Mary Rose) are presented as a control on theory.
Results indicate that wooden wrecks may be readily imaged by a suitable sub-bottom profiler operating under appropriate survey conditions. Particular reference is made to Chirp sonar which transmits a frequency-modulated pulse, providing high-resolution digital seismic data. Chirp data acquired over an eighteenth century buried oak wreck (the Invincible, Horsetail, East Solent) is presented. Calculations of reflection coefficients acquired over the site support both the theoretically and experimentally derived data.

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More information

Published date: March 1997
Keywords: wood, shipwreck, reflection seismology, Chirp
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 363740
URI: http://eprints.soton.ac.uk/id/eprint/363740
ISSN: 1075-2196
PURE UUID: ecc119ec-f5a3-4b25-9e2b-2187fa93856c
ORCID for J.M. Bull: ORCID iD orcid.org/0000-0003-3373-5807
ORCID for J.K. Dix: ORCID iD orcid.org/0000-0003-2905-5403

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Date deposited: 02 Apr 2014 08:57
Last modified: 15 Mar 2024 02:46

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Contributors

Author: R. Quinn
Author: J.M. Bull ORCID iD
Author: J.K. Dix ORCID iD

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