نتایج جستجو برای: aeolian landforms
تعداد نتایج: 3280 فیلتر نتایج به سال:
This paper characterizes the detailed sedimentology of a fluvial sandbody on Mars for the first time and interprets its depositional processes and palaeoenvironmental setting. Despite numerous orbital observations of fluvial landforms on the surface of Mars, ground-based characterization of the sedimentology of such fluvial deposits has not previously been possible. Results from the NASA Mars S...
A range of cold desert landforms are found on the Martian surface that have been interpreted to indicate prevailing frozen and hyper-arid conditions for at least the past several million years. These cold desert conditions are punctuated by brief periods of localized surficial liquid water flow. Sediment transport pathways operate under these conditions of extreme cold and aridity and the proce...
Geomorphological indicators of large-scale climatic changes in the Eastern Bolivian lowlands This study provides an inventory of geomorphologi¬ cal landforms in Eastern Bolivia at different spatial scales. Landforms and associated processes are interpreted and discussed regarding landscape evolution and paleoclimatic significance. Thereby. preliminary conclusions about past climate changes and ...
Most aeolian sediment transport models and experiments have been conducted on flat horizontal surfaces. Very little numerical or analytical research has been carried out for aeolian sand transport on slopes. The current work presents numerical modelling of saltating sand for a climbing dune which has a slope angle of 20”. The model utilised wind fields predicted from the FAA complex terrain mod...
Among the various processes that destroy lands, soil erosion is a complex and hazardous environmental process that constitutes a serious threat to preservation of soil and water resources in Iran and has inflicted its negative effects on the vital ecosystem with the intensified utilization of nature by human beings. The present descriptive and analytic research employed the PSIAC model to study...
Earth’s landscape is continually evolving as land uplifted by tectonic and volcanic processes is eroded by water, ice, and wind. On Earth, the dominant landforms have been produced by the action of rivers and glaciers transporting material from mountains to the sea. The amount and proportion of water and ice available for changing the landscape are both sensitive to climatic regime, so that a s...
Genesis and morphology of soil pendants in Quaternary landforms of Pabranagat Valley, Nevada
Nebkhas, as one of the Eoelian Landforms in dry and semi-dry areas, have significant influence in controlling aeolian erosion and the environment stability. The main question of this study concerns different morphometry of nebkhas in two neighbor sites in Daranjir playa and the main factors which control these landforms. area special properties, the variety of hydrogeology properties, and the...
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