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 20 of 244 for “"DUNE"”.
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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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Airflow dynamics in transverse dune interdunes
Aeolian dune interdunes have been relatively ignored when compared with the research attention on the morphodynamics of the dune bodies themselves. This neglect is in spite of the possible significance of interdune dynamics for the geomorphology of the sand dune system as a whole, especially with …
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Ecological studies of isopoda and diplopoda in dune grassland
… species in the processes of energy transfer in a dune grassland ecosystem. The-species worked on were Armadillidiun vulgare, Porcellio scaber, Philoscia muscorum (Isopoda) and Cylindroiulus latestriatus (Diplopoda). Population data were available for the species from 1968 to 1975. Preliminary …
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Automated detection of dune crest-lines in planetary satellite images
Dune-field patterns are believed to behave as self-organizing systems, but what causes the patterns to form is still poorly understood. The most obvious (and in many cases the most significant) aspect of a dune system is the pattern of dune crest lines. Extracting meaningful features such as crest …
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Remediation of Sand Dune Blowouts Along Pipeline Right of Ways.
Blowouts in sand dunes along pipeline right of ways are a problem facing many pipeline maintenance companies, environmentalists, and public land managers. Blowouts form in sandy soils when the ground surface is not protected from seasonal winds. The ground surface becomes unprotected when there is …
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The response of dune vegetation to human trampling and grazing
The land use history of a South Wales dune system, Merthyr Mawr Warren is described with reference to the present recreational use.<br/><br/>Periodic trampling and wear by motor cycle was applied to previously undamaged vegetation and the effect monitored quantitatively over three seasons. …
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Soft-sediment Deformation and Dune Collapse in the Navajo Sandstone
… with failure of the lee face of a large eolian dune, and run-out over an expanse of interdune sediments downwind of that bedform. Exposed features include dramatic folds in the interdune succession and a stacked series of thrust sheets incorporating both interdune and overlying dune deposits. …
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Alongshore coupling of eco-geomorphological variables in a beach-dune system
ABSTRACT: Coastal dune systems are becoming increasingly vulnerable to erosion and washover due to sea-level rise and changes in storm activity with changing climate. The impact, however, is not consistent within and across coastal barriers and there is a need to examine the alongshore variability …
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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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CHARACTERIZING PATTERNS IN TEXAS GULF COAST BEACH DUNE PLANT SPECIES COMPOSITION
… and ISA for fives zones representing the foredune complex of twenty Gulf Coast beaches. ANOVA revealed that zones differ in terms of percent bare sand, percent vegetative cover, and species richness. Cluster Analysis, ANOSIM, and SIMPER results indicate that Texas beaches can be divided into …
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Constraining the Neutrino Flux for Oscillation Measurements at MicroBooNE and DUNE
… well known for a wide range of tasks, such as DUNE. But in both types of experiment the hardware must first be constructed and extensively tested, to the same standards as the software that will be used to reconstruct and analyse data. This thesis explores both of these facets across the two …
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Sea + Survival: choreographing dune systems to defend against sea-level rise
… development that has suffocated the protective dune systems and public beach space. Where, according to the Sea Level Rise and Flood Risk Assessment for a Select Disaster-Prone Area Along the Western Cape Coast Report, Langebaan is specifically mentioned for being highly susceptible to coastal …
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A Checklist Assessment of Dune Vulnerability and Protection Measures in Wales U.K
… can quantitatively assess the vulnerability of a dune system and the effectiveness of protection measures. A checklist system has been devised that attempts to overcome this problem. The analysis consisted of assessing a series of 54 parameters which are organised into the following five …
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Water and energy balance in the Namib sand-dune lizard, Angolosaurus skoogi
… and water flux of the herbivorous Namib sand-dune lizard, Angolosaurus skoogi, was measured during the summer non-breeding period (early January) by means of doubly labelled water. FMR was about half that expected for a lizard of this size. Water flux and laboratory measured standard metabolic …
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Life History Variation In Artemisia Campestris On A Lake Huron Sand Dune System
… of Artemisia campestris growing on the sand dunes at Pinery Provincial Park, Ontario. Populations in three habitats differing in seral age, vegetation cover, vegetation type and proximity to the lake were selected for study. The distribution of phenotypes within and among populations, genetic …
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Aeolian sand movement in an arid linear dune ecosystem, Nizzana, Western Negev, Israel
… processes were examined in a linear dune area previously used for grazing near Nizzana at the Israeli-Egyptian border. The research area was subject to heavy grazing across the border, which led to the total destruction of the natural vegetation in the period of 1967 to 1982. As a …
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Beach-dune interactions and a new cycle of foredune evolution, Gulf County, Florida
Coastal foredunes are important natural resources that serve as nature’s first line of defense against powerful storms, protecting inland development and human populations. With the ever-increasing possibility of sea-level rise and the potential for increased frequency of major tropical storms, …
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