GPR stratigraphy of a large active dune on Parengarenga Sandspit, New Zealand

Dam, Remke L. Van; Nichol, Scott L.; Augustinus, Paul; Parnell, Kevin E.; Hosking, Peter L.; McLean, Roger

doi:10.1190/1.1614159

Cited by 21 publications

(14 citation statements)

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“…With grainflow deposits, however, it is not always clear whether the fine material at the base represents infiltrated sediment during avalanching or a layer of wind transported laminae deposited between avalanches. The simulated organization is in good agreement with outcrop and seismic observations from various regions around the globe [53][54][55]. Right images from Figure 6 shows the development and overlapping of several dunes sequences leading to the construction of heterogeneous and complex deposits.…”

Section: Polydisperse Particles Evolution Due To Changing Windsupporting

confidence: 65%

Aeolian Sediment Transport Integration in General Stratigraphic Forward Modeling

Salles

Griffiths

Dyt

2011

Journal of Geological Research

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A large number of numerical models have been developed to simulate the physical processes involved in saltation, and, recently to investigate the interaction between soil vegetation cover and aeolian transport. These models are generally constrained to saltation of monodisperse particles while natural saltation occurs over mixed soils. We present a three-dimensional numerical model of steady-state saltation that can simulate aeolian erosion, transport and deposition for unvegetated mixed soils. Our model simulates the motion of saltating particles using a cellular automata algorithm. A simple set of rules is used and takes into account an erosion formula, a transport model, a wind exposition function, and an avalanching process. The model is coupled to the stratigraphic forward model Sedsim that accounts for a larger number of geological processes. The numerical model predicts a wide range of typical dune shapes, which have qualitative correspondence to real systems. The model reproduces the internal structure and composition of the resulting aeolian deposits. It shows the complex formation of dune systems with cross-bedding strata development, bounding surfaces overlaid by fine sediment and inverse grading deposits. We aim to use it to simulate the complex interactions between different sediment transport processes and their resulting geological morphologies.

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Section: Polydisperse Particles Evolution Due To Changing Windsupporting

confidence: 65%

Aeolian Sediment Transport Integration in General Stratigraphic Forward Modeling

Salles

Griffiths

Dyt

2011

Journal of Geological Research

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“…The facies was present in the southeastern portion of the profile and absent in the northwestern portion of the profile. The character of FACIES4 observed is similar in geophysical stratigraphy and environment of occurrence to units observed on GPR and ground truthed on the North Island of New Zealand (van Dam et al, 2003) and known occurrences in the area (Cox et al, 2000).…”

Section: Gpr Data Frommentioning

confidence: 74%

“…Coffee rock is a dark brown to black lightly cemented sandstone. Cementation is through organic compunds (Van Dam et al, 2003). It is a barrier to shallow hand coring and has been encounted during coring in the pattern fens of Moon Point (Moss et al in press).…”

Section: Discussionmentioning

confidence: 99%

“…The low ridges are not consistently orientated with the present beach positon. The wavy character coupled with the stratigraphic character are indicactive of low relief aeolian deposits (van Dam et al, 2003). UNIT2 contains a sub unit, UNIT2a that is interpreted as potential wetland deposits based on comparison of GPR signature to previous work in the area (Gontz et al, 2014;Gontz et al, 2015;van Dam, et al, 2003).…”

Section: Gpr Data Frommentioning

confidence: 99%

“…Ground penetrating radar (GPR) has proven to be a useful tool in assessing the stratigraphic architecture (Gontz, et al, 2014;Hein et al, 2012), reconstructing palaeoenvironments (Switzer et al, 2010) and interpreting processes (van Dam et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ground Penetrating Radar Observations of Present and Former Coastal Environments, Great Sandy National Park, Queensland, Australia – Focus on Moon Point, Fraser Island

Gontz

McCallum

Moss

et al. 2016

Journal of Coastal Research

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Late Quaternary environments, vegetation and agriculture in northern New Zealand

Horrocks

Nichol

Augustinus

et al. 2007

J Quaternary Science

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A sedimentological and plant microfossil history of the Late Quaternary is preserved in two sediment cores from early Polynesian ditch systems on southern Aupouri Peninsula. The study places human activities into a geomorphological and ecological context and allows comparison of natural and anthropogenic effects on two different geological settings: a floodplain and a relatively closed peat swamp. The data fill part of the current gap in the environmental record from northern New Zealand, namely MIS 3 (57k-26k yr BP). There is evidence for an increase in fire frequency in the region after 40k 14 C yr BP, suggesting a shift to drier (and cooler) conditions. Pollen records show that conifer-hardwood forest dominated by podocarps (especially Dacrydium) prevailed prior to Polynesian arrival and deforestation within the last millennium, with Fuscopsora insignificant throughout. Both cores show sections with gaps in deposition or preservation, possible flood-stripping of peat during the pre-Holocene and mechanical disturbance by early Polynesians. The identification of prehistoric starch grains and other microremains of introduced Colocasia esculenta (taro) in both cores supports indirect evidence that the ditch systems of far northern New Zealand were used for the extensive cultivation of this crop.

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GPR stratigraphy of a large active dune on Parengarenga Sandspit, New Zealand

Cited by 21 publications

References 0 publications

Aeolian Sediment Transport Integration in General Stratigraphic Forward Modeling

Aeolian Sediment Transport Integration in General Stratigraphic Forward Modeling

Ground Penetrating Radar Observations of Present and Former Coastal Environments, Great Sandy National Park, Queensland, Australia – Focus on Moon Point, Fraser Island

Late Quaternary environments, vegetation and agriculture in northern New Zealand

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