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.
Results
Showing 1 to 20 of 71 for “"Escarpment"”.
-
Testing the Origins of the Blue Ridge Escarpment
Long, linear, high-relief escarpments mark many of the world's passive margins. These Great Escarpments have been interpreted to be the result of isostatic flexure, parallel slope retreat, and divide migration which accompanies rifting. It is unclear whether all these escarpments share this origin. …
-
Influence of spatially variable precipitation on passive margin escarpment evolution
Passive margin escarpments are large-scale geomorphic features which persist over timescales of tens of millions of years. The maintenance of steep topography over these timescales challenges conventional understanding of fluvial erosion. Typical explanations for passive margin escarpments rely on …
-
Vegetation and flora of the Southern Drakensberg escarpment and adjacent areas
The grasslands of South Africa, and especially the higher altitudinal grasslands, are under increasing human pressure. In this study a floristic-ecological account of the vegetation of the southernmost Drakensberg and its foothills is given. This is the first comprehensive botanical study …
-
Constraints on passive margin escarpment evolution from river basin reorganization in Brazil
Escarpments are present on passive margins around the world, but their evolution is poorly understood. Some geologists interpret escarpments as stationary features, whereas others have argued that they are retreating inland faster than a kilometer per Myr. I investigate Brazilian escarpments by …
-
Karstification of the Pennyroyal Plain Behind the Retreating Chester Escarpment: Warren, Simpson & Logan Counties, Kentucky
… subsurface drainage. As the Chester Upland Escarpment retreats and surface streams are onto the limestones, the streams evolve to become subsurface streams. The five streams observed in the study (all flowing on limestones) demonstrated less karst development close to the Chester Escarpment …
-
A stratigraphical study of the Coloradoan of the Manitoba escarpment with special reference to certain of the calcareous horizons
The geology of Manitoba was studied in a very general way by early explorers after De LaVerendrye's march across the prairies in 1734. It was not until 1875, however, that the Geological Survey of Canada inaugurated its systematic investigation in Manitoba and during the past fifty years the …
-
Impact of pine plantations on the form and mobility of nitrogen in soils of the eastern escarpment region of South Africa
Recent research in the eastern escarpment area of South Africa has documented enhanced NO₃- concentrations in soil solution and stream water resulting from afforestation. There has been much research in the Northern Hemisphere regarding the qualitative and quantitative causes and consequences of N …
-
A combination of apatite fission track and (U-Th)/He thermochronometers to constrain the escarpment evolution in south eastern Australia: a case study of high elevation passive margins
… Two traverses across the coastal lowlands, escarpment and plateau top are used to determine the tempo and styles of response of the landscape to the continental breakup and sea-floor spreading of the Tasman Sea (85 Ma). The three prevailing models of escarpment evolution namely retreat into …
-
Unsettled Settlements: Continuity and change in the Marakwet habitation of the northern Elgeyo Escarpment, northwest Kenya, from c. 1850 to the present-day
… Kacheseker, situated on Kenya’s northern Elgeyo Escarpment. Varied analyses are employed to chart the spatial development of the settlement since its foundation approximately 200 years ago, during which it has changed in terms of both the form and location of its principal habitation zone. To …
-
Soil chemical properties in pine plantations of different ages in the Eastern Escarpement region of South Africa
… Kwazulu-Natal) and in the Sabie area (Eastern Escarpment) have indicated that some forest compartments (Pinus sp.) may experience Ca/Al molar ratios dropping below unity. The value of unity is widely used and proposed as a threshold beyond which tree vitality may be adversely affected. This …
-
The post-breakup evolution of the western Indian high-elevation passive margin
… suggests downwearing or parallel escarpment retreat as alternative models of margin evolution. Here are present the results of a sediment mass balance study utilising new data for the offshore portion of the Western Indian margin, new onshore apatite fission track and (U-Th)/He …
-
The Schizophrenic Virgin (Original writing, Short stories)
… stone brick building at the cliff of the escarpment overlooking the great and infamous cataract. Niagara Falls is renowned for its beauty, majesty, commercialism, honeymooners, tourists, daredevils, death, and above all else---the extraordinary. The Falls itself is a natural phenomenon, …
-
Slope/shelf circulation and cross-slope/shelf transport out of a bay driven by eddies from the open ocean
… waves, are identified in barotropic vortex-escarpment interactions. The two mechanisms advect the potential vorticity (PV) perturbations in opposite directions in anticyclone-induced interactions but in the same direction in cyclone-induced interactions, resulting in dramatic differences in …
-
Geology of the Roberts Hill area in the Hudson Valley fold-thrust belt, Greene County, eastern New York
… south, and the distance between the Helderberg Escarpment and the western deformation front of the HVB is significantly less than in the Catskill area. It appears that the Helderberg Escarpment cuts diagonally across the strike of the HVB, from Catskill to the north, so that only the foreland …
-
Nested clade analysis of geographic structure in the morphologically variable Themeda triandra in South Africa
… along the coast, with the other inland above the escarpment where populations became genetically isolated from populations below the escarpment. Further studies may look for a correlation between morphological variants of T. triandra and the cpDNA haplotypes found within the species.
-
Numerical simulation of a mesoscale convective system over the east coast of South Africa
… 12th. The high-lying topography of the eastern escarpment and high diurnal surface heating possibly provided the trigger for the event. It was also identified that a combination of synoptic features in and around South Africa contributed to the evolution of the system. This particular MCS is …
-
Single grain detrital cosmogenic Ne-21 analysis: a new tool to study long-term landscape evolution
… dissected, high-relief zone marking the Great Escarpment. Denudation rates in the steeper escarpment sub-catchments of the upper Gaub, based on analysis of Be-10 concentrations in 6 amalgamated sediment samples, range from 12.5±0.8 to 14.1±0.9 m/Myr. These rates are twice those obtained for 5 …
-
Textual characteristics of coarse sediments in selected streams of the Niagara Peninsula, Ontario
The streams flowing through the Niagara Escarpment are paved by coarse carbonate and sandstone sediments which have originated from the escarpment units and can be traced downstream from their source. Fifty-nine sediment samples were taken from five streams, over distances of 3,000 to 10,000 feet …
-
Slope/shelf circulation and cross-slope/shelf transport out of a bay driven by eddies from the open ocean
… waves, are identified in barotropic vortex-escarpment interactions. The two mechanisms advect the potential vorticity (PV) perturbations in opposite directions in anticyclone-induced interactions but in the same direction in cyclone-induced interactions, resulting in dramatic differences in …
-
Shifts in suitability distribution of deciduous and citrus fruit trees under climate change in South Africa: a large-scale empirical study
… increases over Lesotho highlands and eastern escarpment and moderate decreases in the Lowveld, with a net increase of 126% of the suitable land area in END-85. Peaches and plums had weak decreases over the highveld and eastern escarpment, although the effects were stronger for plums, which …
Page 1 of 4