Internal structure of aeolian dunes in Abu Dhabi determined using ground‐penetrating radar

Bristow, Charlie S.; Pugh, J.M.; Goodall, Tim

doi:10.1111/j.1365-3091.1996.tb01515.x

Cited by 105 publications

(63 citation statements)

References 14 publications

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“…The directions of maximum gradient in the two trend surfaces are parallel to the two main sand-moving wind directions, from the west or northwest and from the southeast (Bristow et al, 1996;Goudie et al, 2000c). However, as they are 180°to each other, both the observed trends could be explained by either one of these wind directions.…”

Section: Discussionmentioning

confidence: 81%

“…The climate is hot and humid; the hottest month is July (mean annual temperature at Ras Al Khaimah 27Ð4°C) and the most humid month is January (mean monthly humidity 70 per cent) (Böer, 1997). The wind regime is complex, with just under 52 per cent of sand-moving winds blowing from the west and northwest and just under 28 per cent blowing from the southeast (Bristow et al, 1996;Goudie et al, 2000c).…”

Section: Introductionmentioning

confidence: 99%

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Mapping the geochemistry of the northern Rub' Al Khali using multispectral remote sensing techniques

White

Goudie

Parker

et al. 2001

Earth Surf Processes Landf

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Spatial variations in sand sea geochemistry relate to mixing of different sediment sources and to variations in weathering. Due to problems of accessibility, adequate spatial coverage cannot be achieved using field surveys alone. However, maps of geochemical composition produced from remotely sensed data can be calibrated against limited field data and the results extrapolated over large, inaccessible areas. This technique is applied to part of the Rub' Al Khali in the northern United Arab Emirates. Trend surface analysis of the results suggests that the sand sea at this location can be modelled as an east-west mixing zone of two spectral components: terrestrial reddened quartz sands and marine carbonate sands. Optical dating of these sediments suggests that dune emplacement occurred rapidly around 10 ka BP, when sea level was rising rapidly. The spatial distribution of mineralogical components suggests that this phase of dune emplacement resulted from coastal dune sands being driven inland during marine transgression, thereby becoming mixed with rubified terrestrial sands.

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Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Mapping the geochemistry of the northern Rub' Al Khali using multispectral remote sensing techniques

White

Goudie

Parker

et al. 2001

Earth Surf Processes Landf

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“…The availability of Ground Penetrating Radar (GPR) method, since the nineties, provided a fast noninvasive tool to image in detail near surface sedimentary structures (e.g. Gawthorpe et al, 1993;Schenk et al, 1993;Harari, 1996;Bristow et al, 1996;Silva & Scherer, 2000;Neal & Roberts, 2000Van Dam, 2002;Oliveira Jr. et al, 2003;Pedersen & Clemmensen, 2005). Comprehensive reviews of the use of GPR in sedimentological studies were done by and Bristow & Jol (2003).…”

Section: Introductionmentioning

confidence: 99%

From barchan to domic shape: evolution of a coastal sand dune in northeastern Brazil based on GPR survey

Oliveira¹,

Medeiros²,

Tabosa³

et al. 2008

Rev. Bras. Geof.

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ABSTRACT.A sand dune located near São Bento do Norte and Caiçara do Norte towns (northern coastal region of Rio Grande do Norte state, Northeastern Brazil) is rapidly migrating toward urban areas. To understand the depositional processes (evolution of the dune), a Ground Penetrating Radar (GPR) survey was carried out.The survey is composed by sixteen profiles in E-W direction, which is parallel to the dominant wind direction, and five profiles in N-S direction. In both directions, it was used antennas of 200 MHz and 80 MHz. Additionally, a topographic survey, excavations of two trenches, and grain size analysis were also carried out. The GPR imaged the internal sedimentary structures of the coastal deposits so that it was possible to reconstruct the depositional history of the area. Initially, marine sediments were deposited during the final period of a marine regression of Holocene age. After the exposure of the area, a first phase of aeolian deposition occurred over the marine sediments. Later, a depositional hiatus took place, probably associated with partial erosion of the dune. Finally, a second phase of aeolian deposition occurred, covering all previous strata. Based on the geometry of foresets and bounding surfaces, it was interpreted that, in the second phase of aeolian deposition, the dune changed its morphology from barchan to dome. The morphology change appears to have occurred when the migration front of the dune faced the obstacle constituted by a ramp along in the depositional surface dipping against the wind direction. According to the similarities of the foreset dips in the first and second phases of aeolian deposition, the prevailing dominant winds were very similar to present day dominant winds. So, it is likely that the rapidly migration process of the dune toward urban areas is an entirely natural process.Keywords: dune evolution, GPR, dome-shaped dune, barchan dune, northeast Brazil, coastal deposits. RESUMO.Uma duna localizada próximaàs cidades de São Bento do Norte e Caiçara do Norte (litoral nordeste do Rio Grande do Norte, nordeste brasileiro) está migrando rapidamente sobreáreas urbanas. Para entender o processo deposicional (evolução da duna), um levantamento com Radar Penetrante no Solo (GPR) foi realizado. O levantamentoé composto por dezesseis perfis na direção E-W, paralelosà direção dos ventos dominantes, e cinco perfis na direção N-S (utilizando antenas de 200 MHz e 80 MHz). Adicionalmente, foram efetuados escavações de duas trincheiras, um levantamento topográfico e análises granulométricas. O GPR imageou as estruturas sedimentares dos depósitos costeiros de modo que foi possível reconstruir a história deposicional daárea. Inicialmente, sedimentos marinhos foram depositados durante o período final de uma regressão marinha ocorrida no Holoceno. Após a exposição daárea, uma primeira fase de deposição eólica ocorreu sobre os sedimentos marinhos. Mais tarde, ocorreu um hiato deposicional, provavelmente associado com a erosão parcial da duna. Finalmente, ocorreu uma segunda fase de d...

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“…As a result, GPR has been extensively applied to the delineation of stratigraphy including mapping sedimentary facies and stratal geometry (Baker and Jol, 2007;Conyers and Goodman, 1997). For example, the characteristic steeply dipping parallel reflectors in aeolian sediments can be effectively imaged with GPR (Bristow et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Mapping anthropogenic fill with GPR for unmarked grave detection: a case study from a possible location of Mokare’s grave, Albany, Western Australia

Bladon

Moffat

Guilfoyle

et al. 2011

Exploration Geophysics

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Abstract. Geophysical techniques are a commonly used, non-invasive method for the location of unmarked graves. Contrary to popular perception, most studies rely not on directly imaging skeletal material but instead on locating the subsurface disturbance created by grave digging. This approach is effective only when sufficient contrast exists between detectable properties (such as structure, mineralogy or porosity) of the grave fill and the surrounding sediment. Resolving these features can be particularly problematic in disturbed areas where other anthropogenic fill is in place, as it is often complex in character and lacks a natural stratigraphy.In many cultural heritage projects, it is often more important to ensure that burials are not disturbed rather than to specifically locate them. Under these circumstances, ground penetrating radar (GPR) can be used to locate modern anthropogenic fill. This may show which areas of the site are younger than the targeted graves and therefore of no archaeological interest. This approach is trialled on a site thought to contain the grave of Mokare, a significant historical figure in the colonial settlement of the Albany area in Western Australia. The delineation of a package of modern fill in the shallow subsurface in the context of the probable history of earthworks on the site demonstrates that Mokare is not buried in the surveyed location. This approach, applied to suitable sites, could contribute to culturally sensitive non-invasive investigation of burial sites in other locations.

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Internal structure of aeolian dunes in Abu Dhabi determined using ground‐penetrating radar

Cited by 105 publications

References 14 publications

Mapping the geochemistry of the northern Rub' Al Khali using multispectral remote sensing techniques

Mapping the geochemistry of the northern Rub' Al Khali using multispectral remote sensing techniques

From barchan to domic shape: evolution of a coastal sand dune in northeastern Brazil based on GPR survey

Mapping anthropogenic fill with GPR for unmarked grave detection: a case study from a possible location of Mokare’s grave, Albany, Western Australia

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