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dc.contributor.authorBrannigan, Adrian Marken_NZ
dc.date.accessioned2009-03-20T02:15:06Z
dc.date.available2009-07-30T09:51:008Z
dc.date.issued2009en_NZ
dc.identifier.citationBrannigan, A. M. (2009). Change in geomorphology, hydrodynamics and surficial sediment of the Tauranga entrance tidal delta system (Thesis, Master of Science (MSc)). The University of Waikato, Hamilton, New Zealand. Retrieved from https://hdl.handle.net/10289/2799en
dc.identifier.urihttps://hdl.handle.net/10289/2799
dc.descriptionAppendix DVD disc of underwater video clips for determining percentage shell coverage of the sea floor available with the print copy of this thesis, held at the University of Waikato Library.
dc.description.abstractHistorical change in the geomorphology, hydrodynamics, and surficial sediment of the tidal delta system of Tauranga Harbour are investigated with the general aim of analysing The general aims of this thesis are: firstly to analyse historical changes to inlet delta system geomorphology using historical hydrographic charts, secondly, to conduct hydrodynamic numerical modelling using historical bathymetries to access changes in peak spring flow and potential net tidal sediment transport, and thirdly, to analyse historical changes in surficial sediment and bedforms. Geomorphic change was investigated through plotting difference in bathymetry graphs and conducting cross sections taken from digisitied bathymetries obtained from historical hydrographic charts from 1852, 1879, 1901, 1927, 1954 and a modern bathymetry from 2006. Two-dimensional hydrodynamic numerical modelling was conducted to investigate the changes in peak tidal current flow and potential net sediment transport between 1852 and 2006. Changes in surficial sediment patterns were determined through completing a side scan sonar survey with associated sediment samples for ground truthing of grain size and underwater videography to gather surficial shell coverage information. This was used to produce a surficial sediment coverage map which was compared to historical studies Major geomorphological findings include that the shipping channel appears to have induced minor change in the geomorphology of the FTD but such changes are similar to those identified in the historical bathymetries of 1852, 1879, 1901, 1927, 1954 prior to dredging. Significant changes have occurred on the ETD, with the majority of the ETD showing scour of 1 m while the terminal lobe has extended seawards. This is associated with historical (since 1852) narrowing of the inlet from Panepane Point to Mt Maunganui by ~ 900 m. Hydrodynamic numerical modelling has shown a significant increase in potential net tidal sediment transport in the Cutter Channel due to dredging, while the Maunganui Roads Channel shows a reduction of net potential tidal sediment transport that is associated with the dredging of this channel. The area surrounding Panepane Point undergoes significant increases and decreases in net potential tidal sediment transport both before and after dredging Investigation of the surficial sediment patterns over the FTD and ETD from sidescan sonar and bottom samples show that between 1983 and 2007 there has been a northwards extension of the area of major shell (greater than 50 %) converge in the main ebb channel as well as reduction in major shell converge in flood tidal delta ebb shield region. The Maunganui Roads Channel changes from sitly sands to medium and fine sands.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherThe University of Waikatoen_NZ
dc.rightsAll items in Research Commons are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectResidual Distance Ploten_NZ
dc.subjectVan Veen Grab Sampleren_NZ
dc.subjectBedformsen_NZ
dc.subjectAccretionen_NZ
dc.subjectDepostionen_NZ
dc.subjectSediment Transport Pathwaysen_NZ
dc.titleChange in geomorphology, hydrodynamics and surficial sediment of the Tauranga entrance tidal delta systemen_NZ
dc.typeThesisen_NZ
thesis.degree.disciplineScience and Engineeringen_NZ
thesis.degree.grantorUniversity of Waikatoen_NZ
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (MSc)en_NZ
uow.date.accession2009-03-20T02:15:06Zen_NZ
uow.date.available2009-07-30T09:51:008Zen_NZ
uow.identifier.adthttp://adt.waikato.ac.nz/public/adt-uow20090320.021506en_NZ
pubs.place-of-publicationHamilton, New Zealanden_NZ


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