Extraterrestrial dunes: An introduction to the special issue on planetary dune systems

Bourke, M. C.; Lancaster, Nicholas; Fenton, L. K.; Parteli, Eric J. R.; Zimbelman, J. R.; Radebaugh, J.

doi:10.1016/j.geomorph.2010.04.007

Cited by 150 publications

(98 citation statements)

References 160 publications

(193 reference statements)

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“…The origin of this discrepancy is a different qualitative behavior of the normalized average particle velocity V s / √ sgd, as we explain in the following. In aeolian sediment transport, the average velocity of particles impacting and leaving the sediment bed (V o ) is nearly independent of properties of the fluid [6,7,11,45,47,48,51,55,62]. Rather, V o is largely controlled by the characteristics of the sediment bed, for instance by cohesive interparticle forces.…”

Section: Dependence Of the Saturation Length On Particle Size Andmentioning

confidence: 99%

“…Sediment transport along the surface is responsible for a wide range of geophysical phenomena, including surface erosion, dust aerosol emission, and the formation and migration of dunes [1][2][3][4][5][6]. Therefore, the quantitative understanding of sediment transport may improve our understanding of river beds evolution [2], the emission of atmospheric dust [4,6] and the dynamics of planetary sand landscapes [3,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Analytical model for flux saturation in sediment transport

et al. 2014

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The transport of sediment by a fluid along the surface is responsible for dune formation, dust entrainment and for a rich diversity of patterns on the bottom of oceans, rivers, and planetary surfaces. Most previous models of sediment transport have focused on the equilibrium (or saturated) particle flux. However, the morphodynamics of sediment landscapes emerging due to surface transport of sediment is controlled by situations out-of-equilibrium. In particular, it is controlled by the saturation length characterizing the distance it takes for the particle flux to reach a new equilibrium after a change in flow conditions. The saturation of mass density of particles entrained into transport and the relaxation of particle and fluid velocities constitute the main relevant relaxation mechanisms leading to saturation of the sediment flux. Here we present a theoretical model for sediment transport which, for the first time, accounts for both these relaxation mechanisms and for the different types of sediment entrainment prevailing under different environmental conditions. Our analytical treatment allows us to derive a closed expression for the saturation length of sediment flux, which is general and can thus be applied under different physical conditions.

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Section: Dependence Of the Saturation Length On Particle Size Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical model for flux saturation in sediment transport

et al. 2014

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“…The present report is restricted to a discussion of various published results that came after the first workshop, through all of 2011 (with only sparing citation of later work that bears directly upon the results being discussed). Readers are referred to Bourke et al (2010) for treatment of results prior to and including the first workshop, and to Greeley and Iversen (1985), Lancaster (1995Lancaster ( , 2009) for more in-depth discussion of a host of earlier Aeolian studies.…”

Section: Introductionmentioning

confidence: 99%

“…The first six topics are dominated by results derived from the new data from Mars, but the seventh topic indicates that the on-going Cassini mission continues to reveal surprises about the intriguing but perplexing dunes on Titan. Venus is not mentioned here because most of the Aeolian studies for this planet resulted from the Magellan mission in the early 1990s, as reviewed in Bourke et al (2010), and there are no major revisions at present to the Magellan conclusions. Relevant terrestrial analog studies are covered under each topic that is most closely associated with the reported results, emphasizing terrestrial projects that have a particularly strong potential as analogs for the interpretation of planetary Aeolian features.…”

Section: Introductionmentioning

confidence: 99%

Recent developments in planetary Aeolian studies and their terrestrial analogs

2013

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“…Aeolian dune fields stand out as widespread landforms occurring in wet to dry depositional settings (Fryberger and Dean, 1979;Short, 1988;Wang et al, 2002;Livingstone et al, 2007;Martinho et al, 2010) on Earth as well as on other planetary bodies such as Mars, Venus and Saturns moon Titan (Hayward et al, 2007;Radebaugh et al, 2008;Bourke et al, 2010;Fenton and Hayward, 2010). The sand supply for dune fields formation and growth is sensitive to shifts in wind patterns and pluviosity.…”

Section: Introductionmentioning

confidence: 99%

Influence of cell size on volume calculation using digital terrain models: A case of coastal dune fields

Grohmann

Sawakuchi

2013

Geomorphology

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In this work, we analyze how variation in cell size influences the volume calculated from Digital Terrain Models (DTMs) derived from a LiDAR (Light Detection and Ranging) survey in two coastal Late Holocene dune fields in southern Brazil. Cell size varied from 1 to 100 m. The RMSE (Root Mean Square Error) of the resampled DTMs from the original LiDAR (with 0.5 m resolution) increases linearly with cell size, while the R-squared decreases following a secondorder trend. The volume does not show simple linear or exponential behavior, but fluctuates with positive and negative deviations from the original DTM. This fluctuation can be explained by a random factor in the position of the cell with regard to landforms and a relationship between cell and landform size, wherein a small change in cell size can lead to an under-or overestimation of volume. ASTER GDEM (Global Digital Elevation Model) and X-SAR SRTM (Shuttle Radar Topography Mission) 1 arcsec Digital Elevation Models (DEMs) were not considered viable volume sources due to large deviations from the reference data, either as a consequence of noise in the SRTM X-SAR data or lack of bias elevation correction to a common reference base in the GDEM processing chain. Volumes from a 3-arcsec SIR-C SRTM deviated around ± 5% from the reference data and are considered suitable input for numerical simulations of Quaternary dune field evolution models because these values should be within the expected range of sediment volume changes over hundreds to millions of years.

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Extraterrestrial dunes: An introduction to the special issue on planetary dune systems

Cited by 150 publications

References 160 publications

Analytical model for flux saturation in sediment transport

Analytical model for flux saturation in sediment transport

Recent developments in planetary Aeolian studies and their terrestrial analogs

Influence of cell size on volume calculation using digital terrain models: A case of coastal dune fields

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