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Stark, Nina; Coco, Giovanni; Bryan, Karin R; Kopf, Achim J (2012): In-situ geotechnical measurements with the dynamic penetrometer Nimrod on the continental shelf off the Coromandel Peninsula, New Zealand. PANGAEA, https://doi.org/10.1594/PANGAEA.811526, Supplement to: Stark, N et al. (2012): In-situ geotechnical characterization of mixed-grain-size bedforms using a dynamic penetrometer. Journal of Sedimentary Research, 82(7-8), 540-544, https://doi.org/10.2110/jsr.2012.45

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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 (~ 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.
Coverage:
Median Latitude: -36.983117 * Median Longitude: 175.878425 * South-bound Latitude: -36.984267 * West-bound Longitude: 175.877667 * North-bound Latitude: -36.981967 * East-bound Longitude: 175.879183
Date/Time Start: 2009-07-08T00:00:00 * Date/Time End: 2009-07-08T00:00:00
Minimum Elevation: -20.0 m * Maximum Elevation: -20.0 m
Event(s):
Tairua_T10_M * Latitude Start: -36.981967 * Longitude Start: 175.879183 * Latitude End: -36.984267 * Longitude End: 175.877667 * Date/Time Start: 2009-07-08T00:00:00 * Date/Time End: 2009-07-08T00:00:00 * Elevation Start: -20.0 m * Elevation End: -20.0 m * Location: Tairua Beach * Method/Device: NIMROD (NIM) * Comment: Middle transect
Tairua_T10_S * Latitude: -36.984267 * Longitude: 175.877667 * Date/Time: 2009-07-08T00:00:00 * Elevation: -20.0 m * Location: Tairua Beach * Method/Device: NIMROD (NIM) * Comment: North transect
Tairua_T11_M * Latitude Start: -36.981967 * Longitude Start: 175.879183 * Latitude End: -36.984267 * Longitude End: 175.877667 * Date/Time Start: 2009-07-08T00:00:00 * Date/Time End: 2009-07-08T00:00:00 * Elevation Start: -20.0 m * Elevation End: -20.0 m * Location: Tairua Beach * Method/Device: NIMROD (NIM) * Comment: Middle transect
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2NumberNoStark, Nina
3SiteSiteStark, Nina
4DistanceDistancemStark, Ninametres along transect
5Sediment typeSedimentStark, Nina
6NumberNoStark, Nina
7Penetration depthPenetr depthmStark, Nina
8Penetration velocityPenetr velm/sStark, Ninaimpact velocity
9DecelerationDecelgStark, Nina
10Quasi-static bearing capacityqsbckPaStark, NinaCalculated
11Layer thicknessThicknessmStark, Ninathickness of overlying layer
12CommentCommentStark, Nina
13Size fractionFractionStark, Ninadominant grain size
Size:
412 data points

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