Subaqueous “yardangs”: Analogs for aeolian yardang evolution
نویسندگان
چکیده
منابع مشابه
Subaqueous “yardangs”: Analogs for aeolian yardang evolution
[1] Landforms, morphologically similar to aeolian yardangs but formed by erosion of bedrock by currents on an estuarine rock platform, are described for the first time. The geometries of the “yardangs” are described and related to semi-lemniscate shapes that minimize hydraulic drag. The processes of bedrock erosion by the reversing sedimentladen tidal currents are described, and a semi-quantita...
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Introduction: Yardangs are wind-eroded ridges common in regions of Mars [1] and in the most arid deserts on Earth. Yardangs have also been documented on both Venus [2] and Titan [3]. Throughout the years, studies of yardangs have concentrated on particular field sites, and therefore conclusions relating to the controlling parameters on yardang morphology have been highly divergent. Many variabl...
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Isolated landscapes largely shaped by aeolian processes can occur on Earth, while the majority of Mars' recent history has been dominated by wind-driven activity. Resultantly, Martian landscapes often exhibit large-scale aeolian features, including yardang landforms carved from sedimentary-layered deposits. High-resolution orbital monitoring has revealed that persistent bedform activity is occu...
متن کاملA scaling law for aeolian dunes on Mars, Venus, Earth, and for subaqueous ripples
The linear stability analysis of the equations governing the evolution of a flat sand bed submitted to a turbulent shear flow predicts that the wavelength λ at which the bed destabilises to form dunes should scale with the drag length Ldrag = ρs ρf d. This scaling law is tested using existing and new measurements performed in water (subaqueous ripples), in air (aeolian dunes and fresh snow dune...
متن کاملA scaling law for aeolian dunes on Mars, on Earth and subaqueous ripples
The linear stability analysis of equations governing the evolution of a flat sand bed submitted to a shearing flow predicts that the wavelength λ at which the bed destabilises to form dunes should scale with the drag length Ldrag = ρs ρf d. We tested this scaling law using measurements performed in water (subaqueous ripples), in air (aeolian dunes) and in the CO2 martian atmosphere (martian dun...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Earth Surface
سال: 2013
ISSN: 2169-9003
DOI: 10.1029/2011jf002260