Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Dune Migration"”.
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Particle-Resolving Simulations of Dune Migration: Novel Algorithms and Physical Insights
… regimes, including `flat bed in motion', `small dune' and `vortex dune', are in good agreement of with the experimental results and those obtained by using interface resolved simulations. The capability of the solver in the simulation of sediment transport in the oscillatory boundary layer is …
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Assessing the uncertainties of Radar and LiDAR derived digital elevation information over static and dynamic terrain
… over built and vegetated environments. Sand dune migration is studied using satellite laser altimetry. By using the phase of the elevation profiles and applying a cross-correlation between overlapping profiles, we estimate migration vectors resulting in a database that can be correlated with …
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Assessing Dynamic Seabed Change on the Scottish Continental Shelf
… such as wind turbines and subsea cables. Dunes represent wave-like bedforms that range in size and mobility. They are generated by the mobility of sediment forced by the hydrodynamic regime. Geophysical analysis of dune morpho dynamics on the Scottish continental shelf is essential to …
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Using remote sensing to track complex sinuous ripple migration on a barchan dune in Herschel Crater, Mars
Dunes on Mars are known to migrate, in particular ripples have also been found to migrate. This is known to have occurred in eastern, western and southern Herschel Crater, but it was not known if this was true for Central Herschel Crater. Central Herschel Crater is of particular interest as the …
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Sand dune interactions
Sand dunes are coherent sedimentary structures shaped by the shear stress exerted by the overlaying fluid. Natural dunes abundantly populate deserts, river bottoms, sea beds, and even snow fields. They rarely occur in isolation, but usually form extensive dune fields, which continuously evolve due …
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Measurements and dynamics of multiple scale bedforms in tidally energetic environments
… resulting in a longer lag time. Finally, the migration of these superimposed bedforms is considered in chapter 4. Data from the rotary sidescan sonar at Wasque Shoals capture the interaction of smaller bedforms, or megaripples, with a dune. The net convergence of megaripples on the tidally …
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Holocene playas as sedimentary evidence for recent climate change in the presently hyperarid western desert, Egypt
… cultural abandonment, evaporite precipitation, dune migration, and deflation. The AMS dates from Umm Akhtar Playa fall in the same range as published radiocarbon data from contemporary sites and playas in Egypt and northern Sudan; the main period of enhanced surface water storage from 8100-6000 …
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Measurements and dynamics of multiple scale bedforms in tidally energetic environments
… resulting in a longer lag time. Finally, the migration of these superimposed bedforms is considered in chapter 4. Data from the rotary sidescan sonar at Wasque Shoals capture the interaction of smaller bedforms, or megaripples, with a dune. The net convergence of megaripples on the tidally …
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Modelización de la evolución morfodinámica de la duna de Valdevaqueros (t.m. Tarifa) mediante la aplicación de funciones empíricas ortogonales a corto, medio y largo plazo
… given rise to the transgressive Valdevaqueros dunefield. The dune advance has resulted in gradual invasion of the adjacent road and ecosystem. Despite restoration and control activities performed within the last decades, strong east winds have favoured dune destabilisation. The current work …