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In-situ geotechnical characterization of mixed-grain-size bedforms using a dynamic penetrometer

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dc.contributor.author Stark, Nina
dc.contributor.author Coco, Giovanni
dc.contributor.author Bryan, Karin R.
dc.contributor.author Kopf, Achim
dc.date.accessioned 2012-11-30T02:06:31Z
dc.date.available 2012-11-30T02:06:31Z
dc.date.copyright 2012-07-27
dc.date.issued 2012
dc.identifier.citation Stark, N., Coco, G., Bryan, K. R., & Kopf, A. (2012). In-situ geotechnical characterization of mixed-grain-size bedforms using a dynamic penetrometer. Journal of Sedimentary Research, 82(7), 540-544. en_NZ
dc.identifier.issn 1527-1404
dc.identifier.uri http://hdl.handle.net/10289/6907
dc.description.abstract We tested the ability of a small dynamic penetrometer, Nimrod, to infer geotechnical properties of sediment mixtures in the inner shelf. The penetrometer is light and easy to operate, and its operation by scuba divers ensures a greater degree of precision than ship-based penetrometer deployments. We have studied selected positions along a sorted bedform (similar to 100 m wide) on the continental shelf off the Coromandel Peninsula close to Tairua, North Island of New Zealand, and additionally took sediment samples at the exact positions of penetrometer impact, also by scuba divers. The derived dynamic penetrometer signatures (i) measured deceleration of the probe and estimated quasi-static bearing capacity as a measure of sediment strength, (ii) reflected changes in grain-size distribution ranging from very fine to very coarse sands, and (iii) revealed the uppermost seafloor stratification (top layer 2-6 cm) potentially being an indicator for sediment dynamics. In this manner, the device proved to be suitable for spatially fine-scaled surveys using divers' support and might deliver complementary information about sediment dynamics, in this case sorted-bedform maintenance en_NZ
dc.language.iso en
dc.publisher Society of Sedimentary Geology en_NZ
dc.relation.ispartof Journal of Sedimentary Research
dc.subject Sediments en_NZ
dc.subject Strength en_NZ
dc.subject Sand en_NZ
dc.title In-situ geotechnical characterization of mixed-grain-size bedforms using a dynamic penetrometer en_NZ
dc.type Journal Article en_NZ
dc.identifier.doi 10.2110/jsr.2012.45 en_NZ


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