Mapping the Morphology of a Dredged Ebb Tidal Delta, Tauranga Harbour, New Zealand

Krüger, Jens C.; Healy, Terry R.

doi:10.2112/03-0117.1

Cited by 8 publications

(8 citation statements)

References 22 publications

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“…Grain size distributions offshore of Tauranga Harbour indicate that sediments of the outer belt, i.e., the inner shelf, are dominated by medium-coarse-grained sand. Previous studies indicate that these sands are relict Pleistocene deposits that were reworked during the last glacial [Harms, 1989;Bradshaw et al, 1994;Michels and Healy, 1999;Krüger and Healy, 2006]. A clear positive correlation is evident between magnetic susceptibility and magnetic grain size in offshore samples in bivariate plots (Figure 8).…”

Section: Influence Of Sediment Particle Size On Magnetic Propertiesmentioning

confidence: 67%

“…[8] Tauranga Harbour is a large mesotidal estuarine lagoon situated centrally within the Bay of Plenty covering an area of 851 km 2 [Krüger and Healy, 2006]. It is enclosed by two Holocene tombolos and a 24-km-long sand barrier island, Matakana Island.…”

Section: Geography and Geologymentioning

confidence: 99%

“…The entrance has a mean tidal range of 1.4 m and a mean annual significant wave height of 0.5 m [De Lange, 1991]. The width of the entrance throat is 500 m with a maximum water depth of 34 m and a mean depth of 15 m [Krüger and Healy, 2006]. Wairoa River is the major fresh water source into Tauranga Harbour and has a large, mostly volcanic catchment area of about 465 km 2 .…”

Section: Geography and Geologymentioning

confidence: 99%

“…These investigations were based on side scan survey and surface sediment sampling campaigns within nearshore and inner shelf areas offshore of Tauranga Harbour [Harms, 1989;Bradshaw et al, 1994;Michels and Healy, 1999;Krüger and Healy, 2006]. These authors showed that coarse-grained sands were partially covered by thin patches and sheets of transgressive fine sands that are transported under low energy conditions, while coarser-grained sands remain in place on the inner shelf as erosional lag or relict deposits.…”

Section: Surf-zone Processes and Magnetite Enrichment Offshore Tauranmentioning

confidence: 99%

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Formation of magnetite‐enriched zones in and offshore of a mesotidal estuarine lagoon: An environmental magnetic study of Tauranga Harbour and Bay of Plenty, New Zealand

Badesab

Dobeneck

Bryan

et al. 2012

Geochem Geophys Geosyst

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[1] Magnetic iron minerals are widespread and indicative sediment constituents in estuarine, coastal and shelf systems. We combine environmental magnetic, sedimentological and numerical methods to identify magnetite-enriched placer-like zones in a complex coastal system and delineate their formation mechanisms. Magnetic susceptibility and remanence measurements on 245 surficial sediment samples collected in and around Tauranga Harbour, the largest barrier-enclosed tidal estuary of New Zealand, reveal several discrete enrichment zones controlled by local hydrodynamic conditions. Active magnetite enrichment takes place in tidal channels, which feed into two coast-parallel nearshore magnetite-enriched belts centered at water depths of 6-10 m and 10-20 m. A close correlation between magnetite content and magnetic grain size was found, where higher susceptibility values are associated within coarser magnetic crystal sizes. Two key mechanisms for magnetite enrichment are identified. First, tide-induced residual currents primarily enable magnetite enrichment within the estuarine channel network. A coast-parallel, fine sand magnetite enrichment belt in water depths of less than 10 m along the barrier island has a strong decrease in magnetite ©2012. American Geophysical Union. All Rights Reserved.1 of 20 content away from the southern tidal inlet and is apparently related to active coast-parallel transport combined with mobilizing surf zone processes. A second, less pronounced, but more uniform magnetite enrichment belt at 10-20 m water depth is composed of non-mobile, medium-coarse-grained relict sands, which have been reworked during post-glacial sea level transgression. We demonstrate the potential of magnetic methods to reveal and differentiate coastal magnetite enrichment patterns and investigate their formative mechanisms.

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Section: Influence Of Sediment Particle Size On Magnetic Propertiesmentioning

confidence: 67%

Section: Geography and Geologymentioning

confidence: 99%

Section: Geography and Geologymentioning

confidence: 99%

Section: Surf-zone Processes and Magnetite Enrichment Offshore Tauranmentioning

confidence: 99%

See 2 more Smart Citations

Formation of magnetite‐enriched zones in and offshore of a mesotidal estuarine lagoon: An environmental magnetic study of Tauranga Harbour and Bay of Plenty, New Zealand

Badesab

Dobeneck

Bryan

et al. 2012

Geochem Geophys Geosyst

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“…Finegrained sediments are, however, the dominant component of ebb-tidal deltas deposited in association with several tide-dominated coastlines (eg, Huelva coast, southern Spain; Morales et al, 2001). Nevertheless, in contrast with most of them (eg, Huelva coast, southern Spain and Tauranga Harbour, New Zealand; Morales et al, 2001 andKrueger andHealy 2006, respectively), no depositional bedforms have been identified on the Venice Lagoon ebb-tidal delta. The distance between the profiles is, however, very large (500 m as a minimum) and thus it is suggested that the available data set is inadequate to detect features a few metres wide.…”

Section: Discussionmentioning

confidence: 99%

The ebb-tidal delta of the Venice Lagoon, Italy

et al. 2008

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Very high-resolution seismic lines were collected offshore the Venice Lagoon in the framework of the Co.Ri.La `New very high resolution seismic methods to study the Venice Lagoon subsoil' project. The 140 km boomer profiles led to the identification of a convex-upward, lens-shaped body just outside the Lido inlet, one of the three lagoon inlets, which has been interpreted as an ebb-tidal delta. The comparison between the seismostratigraphic setting of this deposit, as revealed by the seismic lines, and the analyses of historical bathymetric maps highlighted the key role of human interventions in the formation and evolution of the Lido inlet ebb-tidal delta. To preserve the lagoon environment but also to ensure a navigable way, human interventions at the Lido inlet, performed since the fourteenth century, caused profound variations in the inlet dynamics, leading to a progressive increase in the sediment dispersion from the lagoon interior towards the sea. The ebb-tidal delta of the Lido inlet is thus a very recent feature compared with the formation of the Venice lagoon and formed mainly as a consequence of the construction of the two jetties that have bound the inlet from AD 1886 to the present day.

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A large mid-channel sand bar in the macrotidal seaway of outer Asan Bay, Korea: 30 years of morphologic response to anthropogenic impacts

et al. 2009

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Mapping the Morphology of a Dredged Ebb Tidal Delta, Tauranga Harbour, New Zealand

Cited by 8 publications

References 22 publications

Formation of magnetite‐enriched zones in and offshore of a mesotidal estuarine lagoon: An environmental magnetic study of Tauranga Harbour and Bay of Plenty, New Zealand

Formation of magnetite‐enriched zones in and offshore of a mesotidal estuarine lagoon: An environmental magnetic study of Tauranga Harbour and Bay of Plenty, New Zealand

The ebb-tidal delta of the Venice Lagoon, Italy

A large mid-channel sand bar in the macrotidal seaway of outer Asan Bay, Korea: 30 years of morphologic response to anthropogenic impacts

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