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dc.contributor.authorJorat, M. Ehsanen_NZ
dc.contributor.authorMoon, Vicki G.en_NZ
dc.contributor.authorHepp, Daniel A.en_NZ
dc.contributor.authorKreiter, Stefanen_NZ
dc.contributor.authorde Lange, Willem P.en_NZ
dc.contributor.authorFeldmann, Sen_NZ
dc.contributor.authorMoerz, Tobiasen_NZ
dc.date.accessioned2017-12-19T01:49:41Z
dc.date.available2017-03-01en_NZ
dc.date.available2017-12-19T01:49:41Z
dc.date.issued2017-03-01en_NZ
dc.identifier.citationJorat, M. E., Moon, V. G., Hepp, D. A., Kreiter, S., de Lange, W. P., Feldmann, S., & Moerz, T. (2017). Subseafloor Investigation of Sediments at Southern Tauranga Harbour, New Zealand, before Capital Dredging. Journal of Coastal Research, 33(2), 227–242. https://doi.org/10.2112/JCOASTRES-D-15-00208.1en
dc.identifier.issn0749-0208en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11586
dc.description.abstractThe Port of Tauranga plays a key role in New Zealand's export–import industry, and capital dredging commenced in October 2015 to extend the shipping channels to accommodate larger container vessels. This study investigated two-dimensional and three-dimensional subsurface estuarine sediment stratigraphy to predict the sedimentological conditions encountered during dredging operations to ensure that appropriate dredging methodologies were used to minimise the generation of turbidity. Eight cone penetration tests (CPTs), 14 core descriptions, and a high-resolution seismic investigation in Stella Passage (the main shipping channel of Tauranga Harbour) provided the basis for this research. Six major units comprise the stratigraphy; in ascending order they are lower pumiceous sand and silt (UNIT6), quartz-feldspar sand and silt (UNIT5), middle pumiceous sand and silt (UNIT4), silt–sand–clay (UNIT3), upper pumiceous sand and silt (UNIT2), and Holocene marine (UNIT1) sediments forming the modern seafloor. Three paleovalleys filled with sediments from UNIT2 were identified extending west to east across the channel. The CPT profiles were correlated with the seismostratigraphic units and their corresponding soil behaviour type to characterise each unit's sediment stiffness. The UNIT6 is unlikely to be encountered in current and future capital dredging operations because it is the lowest observed unit. A special dredging methodology may be required for UNIT5 and UNIT4 as they have high CPT tip resistance and undrained shear strength. For UNIT3, UNIT2, and UNIT1, which have very low CPT tip resistance and undrained shear strength, trailing suction and cutter suction dredging is appropriate. The potential turbidity of the water column, however, could impose a significant threat to marine biota and has to be taken into account.
dc.language.isoenen_NZ
dc.publisherCoastal Education & Research Foundationen_NZ
dc.rights© Coastal Education and Research Foundation, Inc. 2017
dc.subjectScience & Technologyen_NZ
dc.subjectLife Sciences & Biomedicineen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectEnvironmental Sciencesen_NZ
dc.subjectGeography, Physicalen_NZ
dc.subjectGeosciences, Multidisciplinaryen_NZ
dc.subjectEnvironmental Sciences & Ecologyen_NZ
dc.subjectPhysical Geographyen_NZ
dc.subjectGeologyen_NZ
dc.subjectTauranga Harbouren_NZ
dc.subjectcone penetration testen_NZ
dc.subjectsoil behaviour typeen_NZ
dc.subjectseismic surveyen_NZ
dc.subjectvolcanoclastic materialen_NZ
dc.subjectsiliciclastic materialen_NZ
dc.subjectSUSPENDED SEDIMENTen_NZ
dc.subjectBOREHOLE DATAen_NZ
dc.subjectIMPACTSen_NZ
dc.subjectSEQUENCESen_NZ
dc.subjectESTUARIESen_NZ
dc.subjectBASINen_NZ
dc.titleSubseafloor Investigation of Sediments at Southern Tauranga Harbour, New Zealand, before Capital Dredgingen_NZ
dc.typeJournal Article
dc.identifier.doi10.2112/JCOASTRES-D-15-00208.1en_NZ
dc.relation.isPartOfJournal of Coastal Researchen_NZ
pubs.begin-page227
pubs.elements-id141324
pubs.end-page242
pubs.issue2en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/2018 PBRF
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/2018 PBRF - FSEN
pubs.organisational-group/Waikato/FSEN/School of Science
pubs.organisational-group/Waikato/FSEN/School of Science/2018 PBRF - School of Science
pubs.publication-statusPublisheden_NZ
pubs.volume33en_NZ
dc.identifier.eissn1551-5036en_NZ


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