Reflection Coefficient Calculation from Marine High Resolution Seismic Reflection (Chirp) Data and Application to an Archaeological Case Study |
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| Authors: | Bull Jonathan M Quinn Rory Dix Justin K |
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| Institution: | (1) Department of Geology, Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, United Kingdom;(2) Department of Oceanography, Southampton Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, United Kingdom;(3) Coastal Studies Research Group, School of Environmental Sciences, University of Coleraine, Coleraine, BT52 1SA, United Kingdom |
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| Abstract: | Chirp sub-bottom profilers produce high-resolution images of the near-surface. An attribute of the sea-bed reflection in chirp data are fluctuations in polarity between adjacent traces. Two models are proposed and presented to explain this: the first incorporates changes in an acoustic impedance gradient at the sea bed; the second uses changes in the thickness of the uppermost sediment layer. Mixing of adjacent traces produces a consistent polarity for the sea-bed reflector. Reflection coefficients are calculated, using amplitude information derived from single-traces, and polarity information from trace mixing, with application to a marine archaeological case study. The reflection coefficient calculated for the top of a buried 18th century wooden wreck is -0.26. |
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| Keywords: | Chirp profilers high resolution images archaeological case study |
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