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 180 for “"dunes"”.
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The morphology of alluvial sand dunes
This Dissertation was approved for publication on 2021-04-15 at 12:04.
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Bidirectional Distribution Reflection Function of Algodones Dunes
… of this project was to develop the Algodones Dunes as a pseudo-invariant calibration site (PICS) suitable for absolute calibration of satellite sensors based on a surface reflectance model. Two approaches were taken during this research: a field campaign and laboratory measurements. The first …
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The flow structure of interacting barchan dunes
… to examine the effects of interacting barchan dunes on the flow structure. The barchan dune models were based upon an idealized contour map, the shape and dimensions of which were based upon previous empirical studies of dune morphology. The experimental setup comprised two, co-axially aligned …
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Pedogenesis on the Sefton Coastal Dunes, NW England
… sand and mobile dune communities into ‘frontal dunes’ and fixed dune community, pasture, scrub, deciduous woodland and coniferous plantations into ‘hind dunes’, separating these topsoil environments from heath and slack communities. Factor analysis also identifies linkages between …
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Integrated Monitoring and Eco-Morphodynamic Modeling of Coastal Dunes
L'abstract è presente nell'allegato / the abstract is in the attachment
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The sedimentology and dynamics of mega-dunes, Jamuna river, Bangladesh
… entire flow column beneath the survey vessel. Dunes are ubiquitous in the Jamuna and range in height from 0.15 to over 6m and in wavelength from 3 to 300 m. Both dune height and wavelength alter systematically with flow stage, increasing by factors of 6 and 8 respectively between low and high …
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Chronosequence studies of ecosystem development of Leymus arenarius dunes in Iceland
Sandhólasvæði, sem hér á landi eru einkum melhólar eða mellönd, eru kvik vistkerfi með stöðugu áfoki sands. Sambærileg vistkerfi er að finna um allan heim, frá hásléttum meginlandanna, áraurum til fjörusanda. Þau eru umfangsmikil á Íslandi en hér er að finna yfir 22.000 km2 af sandauðnum, allt frá …
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Avalanching on dunes and its effects: Size statistics, stratification, & seismic surveys
… true in the case of grain flows on sand dunes, in which the sedimentary stratification with which geologists are concerned arises from the granular processes investigated by physicists and engineers, and the water permeation that interests hydrologists and soil scientists determines the …
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Dynamics of dunes in an intertidal environment at Nauset Inlet, Massachusetts.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Effect of Unsteady Surface Water Hydraulics on Mixing-Dependent Hyporheic Denitrification in Riverbed Dunes
Increased reactive nitrogen from human activities negatively affects surface water (SW) quality. The hyporheic zone, where SW and groundwater interact, possesses unique biogeochemical conditions that can attenuate contaminants (e.g., denitrification), including mixing-dependent reactions that …
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Environmental governance of sand mining in an urban setting : Macassar Dunes, Cape Town, South Africa
… located on the edges of cities. The Macassar Dunes are an important source of building sand for the City of Cape Town. The area is located within the Cape Floral Kingdom, the smallest and richest of the six floral kingdoms of the world. The Macassar Dunes area has been identified as a core …
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An Assessment of Visual Encounter Surveys for an Elusive Species: The Dunes Sagebrush Lizard (Sceloporus arenicolus)
The Dunes Sagebrush Lizard (Sceloporus arenicolus - DSL) is a highly cryptic, habitat specialist that shows a preference for environments comprised of large wind-blown sand dune complexes and dense arrays of shinnery oak (Quercus harvardii). This species occupies a narrow range in the Monahans …
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Spatial and temporal variations in soil and vegetation dynamics on stabilized desert dunes in Ningxia, China
… at Shapotou Research Station, where an area of dunes, representing a 37 year stabilization chronosequence, allowed the progress of vegetated dune stabilization to be investigated. Investigations were made into dune vegetation dynamics, aeolian deposition, microphytic crust formation and …
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HABITAT CHARACTERISTICS AND DEMOGRAPHY OF CALYPSO BULBOSA AND CYPRIPEDIUM ARIETINUM IN THE GRAND SABLE DUNES, MICHIGAN
… arietinum </em>in the Grand Sable Dunes, Pictured Rocks National Lakeshore, Michigan, USA. Data for <em>Cypripedium arietinum</em> was collected from 345, 1-m radius plots in a stratified (by island) random sampling design. The total number of <em>C. arietinum</em> in 2009 was …
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A Study of Aspects of the Coupling of Flow and Sediment Transport for Sand and Gravel Dunes
… transport and changes to geometry of river dunes. It aims to broaden the understanding of this coupling by examining: a) intrinsic differences between flow and sediment transport over equilibrium and non-equilibrium dunes; and b) whether the equations relating flow conditions to dune …
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