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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.

Basisinformatie over ‘Open Access to scholarly information'.

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Optimising protocols for high-definition imaging of historic shipwrecks using multibeam echosounder Westley, K.; Plets, R.; Quinn, R.; McGonigle, C.; Sacchetti, F.; Dale, M.; McNeary, R.; Clements, A. (2019). Optimising protocols for high-definition imaging of historic shipwrecks using multibeam echosounder. Archaeological and Anthropological Sciences 11(7): 3629-3645. https://dx.doi.org/10.1007/s12520-019-00831-6 In: Archaeological and Anthropological Sciences. Springer: Heidelberg. ISSN 1866-9557; e-ISSN 1866-9565, meer Is gerelateerd aan: Westley, K.; Plets, R.; Quinn, R.; McGonigle, C.; Sacchetti, F.; Dale, M.; McNeary, R.; Clements, A. (2019). Correction to: Optimising protocols for high-definition imaging of historic shipwrecks using multibeam echosounder. Archaeological and Anthropological Sciences 11(7): 3647-3648. https://dx.doi.org/10.1007/s12520-019-00844-1, meer

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VLIZ: Non-open access 345409 [ aanvragen ]

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Westley, K. Plets, R., meer Quinn, R. McGonigle, C.	Sacchetti, F. Dale, M. McNeary, R. Clements, A.

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Abstract

Conservation of historic shipwrecks is prohibitively expensive and in situ preservation and recording are the preferred archaeological approaches. Non-destructive high-definition 3D imaging is therefore essential for recording and managing submerged historic shipwrecks. Multibeam echosounders (MBES), the standard tool for hydrographic survey, can produce point clouds to image complex 3D structures. However, wreck imaging is often done using MBES in traditional survey mode optimised for morphological characterisation of the seafloor. This does not necessarily provide high-definition imagery required by archaeologists. This study demonstrates key factors influencing high-definition MBES imaging of wrecks through a controlled field experiment. Results show that optimal high-definition 3D imaging is achieved through maximising the pulse rate, narrowing the angular sector, using the highest frequency and shortest pulse lengths, applied to at least 3 to 5 overlapping centreline-parallel and offset passes with additional perpendicular/oblique lines. Variations in survey design are demonstrated to exert strong controls on sounding density and distribution, with high-density on horizontal and vertical wreck surfaces enabled by a combination of overlapping passes and offset lines. Adoption of this method would result in more widespread high-definition 3D imaging of wrecks to benefit archaeological research and develop effective mitigation strategies to minimise loss of the fragile underwater resource.

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