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dc.contributor.authorKulgemeyer, Tobiasen_NZ
dc.contributor.authorvon Dobeneck, Tiloen_NZ
dc.contributor.authorMüller, Hendriken_NZ
dc.contributor.authorBryan, Karin R.en_NZ
dc.contributor.authorde Lange, Willem P.en_NZ
dc.contributor.authorBattershill, Christopher N.en_NZ
dc.date.accessioned2016-05-02T03:11:03Z
dc.date.available2016-03en_NZ
dc.date.available2016-05-02T03:11:03Z
dc.date.issued2016-03en_NZ
dc.identifier.citationKulgemeyer, T., von Dobeneck, T., Müller, H., Bryan, K. R., de Lange, W. P., & Battershill, C. N. (2016). Lithofacies distribution and sediment dynamics on a storm-dominated shelf from combined photographic, acoustic and sedimentological profiling methods (Bay of Plenty, New Zealand). Marine Geology, 376, 158–174. http://doi.org/10.1016/j.margeo.2016.03.005en
dc.identifier.issn0025-3227en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10156
dc.description.abstractSediment dynamics on a storm-dominated shelf (western Bay of Plenty, New Zealand) were mapped and analyzed using the newly developed multi-sensor benthic profiler MARUM NERIDIS III. An area of 60 km × 7 km between 2 and 35 m water depth was surveyed with this bottom-towed sled equipped with a high-resolution camera for continuous close-up seafloor photography and a CTD with connected turbidity sensor. Here we introduce our approach of using this multi-parameter dataset combined with sidescan sonography and sedimentological analyses to create detailed lithofacies and bedform distribution maps and to derive regional sediment transport patterns. For the assessment of sediment distribution, photographs were classified and their spatial distribution mapped out according to associated acoustic backscatter from a sidescan sonar. This provisional map was used to choose target locations for surficial sediment sampling and subsequent laboratory analysis of grain size distribution and mineralogical composition. Finally, photographic, granulometric and mineralogical facies were combined into a unified lithofacies map and corresponding stratigraphic model. Eight distinct types of lithofacies with seawards increasing grain size were discriminated and interpreted as reworked relict deposits overlain by post-transgressional fluvial sediments. The dominant transport processes in different water depths were identified based on type and orientation of bedforms, as well as bottom water turbidity and lithofacies distribution. Observed bedforms include subaquatic dunes, coarse sand ribbons and sorted bedforms of varying dimensions, which were interpreted as being initially formed by erosion. Under fair weather conditions, sediment is transported from the northwest towards the southeast by littoral drift. During storm events, a current from the southeast to the northweast is induced which is transporting sediment along the shore in up to 35 m water depth. Shorewards oriented cross-shore transport is taking place in up to 60 m water depth and is likewise initiated by storm events. Our study demonstrates how benthic photographic profiling delivers comprehensive compositional, structural and environmental information, which compares well with results obtained by traditional probing methods, but offers much higher spatial resolution while covering larger areas. Multi-sensor benthic profiling enhances the interpretability of acoustic seafloor mapping techniques and is a rapid and economic approach to seabed and habitat mapping especially in muddy to sandy facies.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherELSEVIER SCIENCE BVen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Marine Geology. © 2016 Elsevier.
dc.subjectlithofacies mappingen_NZ
dc.subjectsediment transporten_NZ
dc.subjectcoastal sedimentologyen_NZ
dc.subjectseafloor photographyen_NZ
dc.subjectsubaquatic dunesen_NZ
dc.subjectsorted bedformsen_NZ
dc.subjectbenthic profilingen_NZ
dc.titleLithofacies distribution and sediment dynamics on a storm-dominated shelf from combined photographic, acoustic and sedimentological profiling methods (Bay of Plenty, New Zealand)en_NZ
dc.typeJournal Article
dc.identifier.doi10.1016/j.margeo.2016.03.005en_NZ
dc.relation.isPartOfMarine Geologyen_NZ
pubs.begin-page158
pubs.elements-id137801
pubs.end-page174
pubs.publication-statusPublisheden_NZ
pubs.volume376en_NZ
uow.identifier.article-noCen_NZ


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