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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 54 for “"sand 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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Measuring changes in areal extent of historic wetlands at Great Sand Dunes National Monument, Colorado 1936-1995
Great Sand Dunes National Monument (GRSA) is a unit of the National Park system in south central Colorado. With funding from the Colorado Historical Society, a series of studies were undertaken for an environmental history of the GRSA area and the San Luis Valley. Park managers were concerned over …
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A comparative study of Corynephorus canescens (L.) P.Beauv. communities of inland sand dunes in England and Poland
Inland sand dunes supporting Grey Hair-grass Corynephorus canescens are a declining European habitat designated for conservation under the EU’s Habitats Directive. In Britain they are confined to a handful of sites in East Anglia and the West Midlands. This study investigated the relationships of …
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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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Assessing the indigenous Arbuscular mycorrhizal fungi (AMF) community associated with sea oats along the Georgia coast at Jekyll and Tybee Islands
<p>Coastal sand dunes are fragile ecosystems that serve as natural defenses to protect the adjacent mainland by absorbing the impacts and energy from severe storms. Different efforts have been taken to restore coastal sand dunes, focusing on foredunes. However, there are many strategies involved …
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Cross-Bedding
… deltas, fluvial bars and channel fills, beaches, sand dunes, and as eolian deposits modifying any of the others. It ranges in size from microscopic to tens of yards thick. Ripple-marks are considered to be miniature dunes. The most important uses of cross-bedding are as a top and bottom indicator …
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Microwave Remote Sensing of Saharan Ergs and Amazon Vegetation
… ergs are related to geophysical properties of sand formations and near surface winds. The spatial and temporal variability of the Amazon vegetation is studied using multi-frequency and multi-polarization data. The Sahara desert includes large expanses of sand dunes called ergs that are …
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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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Sand dune movement and its impact on human activities in the North Western coast region of Libya. An analysis of the sediment characteristics of sand dunes, and their movement using satellite images, and the effects of encroachment on farms assessed by a questionnaire survey.
Sand movement is one of the many environmental problems facing humans in the dry and semi-dry areas of the world. This study has investigated the observed changes in sand dune coverage compared to predictions, and has also assessed the impact of sand movement on human activity in the north western …
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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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ΦΥΤΟΚΟΙΝΩΝΙΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΕΠΙ ΤΗΣ ΒΛΑΣΤΗΣΕΩΣ ΤΟΥ ΔΕΛΤΑ ΤΟΥ ΠΟΤΑΜΟΥ ΕΒΡΟΥ (ΑΙΝΙΣΙΟ ΔΕΛΤΑ)
… OF THE AREA, WHICH ARE A) DRIFT LINE, B) SAND DUNES, C) SALT MARSHES, AND D) THE WATERS. THE HUMIDITY AND THE SALINITY WERE THE MOST SIGNIFICANT SOIL-FACTORS. ALSO, THERE WAS AN INFLUENCE FROM THE EAST IN THE VEGETATION OF THE AREA.
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Late Quaternary semiarid eolian system dynamics : distribution, timing, and soil geomorphic controls, Black Mesa, northeastern Arizona, USA
… eolian deposits and older ages for sand sheets than were reported by previous investigators. Chapter 2 focuses on the distribution, age, and geomorphic implications of topographically-controlled eolian deposits on Black Mesa. Chapter 3 describes the role of advanced soil profile …
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Flexing the Flux: Re-Appropriating Muizenberg Beachfront as a response to contextual dynamism
… of the physics that govern the movement of beach sand, and thereby, the formation of sand dunes. The experiment included placing a series of objects on a stretch of beach in Cape Town, and were observed over five days. The forms chosen represent the impact of man on the beach - specifically the …
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Crater ice deposits near the south pole of Mars
… We consider the possibility that crater sand dunes may have promoted ice accumulation over time and weigh various explanations for the origins and larger climatic significance of these features.
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And she built a crooked house
… basis. Water and minerals slowly build into sand dunes and caverns of stalactites and stalagmites. It is the mystery and force of these complex occurrences of nature that compelled me to build And She Built a Crooked House.
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A study of forest ecosystem development
… on skeletal soils and integrades to Yellow-Brown Sands. Every endeavour was made to keep other soil forming factors (and the influence of other factors on the ecosystem) as constant as possible, thus satisfying the criteria for a chronosequence. Studies of this type have considerable theoretical …
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GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… has tills preserved on many higher slopes, and sand dunes cover wide areas of fluvial sediments from a braided river system. Extensive alluvial and debris fans make up the Shigar Valley, and a sackung follows an anticline on its western ridge. In the narrow Braldu Valley between Dassu and …
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GEOMORPHOLOGICAL MAPPING OF THE K2 AREA, PAKISTAN USING GIS AND REMOTE SENSING
… has tills preserved on many higher slopes, and sand dunes cover wide areas of fluvial sediments from a braided river system. Extensive alluvial and debris fans make up the Shigar Valley, and a sackung follows an anticline on its western ridge. In the narrow Braldu Valley between Dassu and …
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