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Showing 1 to 20 of 36 for “"Gullies"”.
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Sediment in forested and logged gullies, coastal British Columbia
… study examines sediment storage and transfers in gullies of coastal British Columbia, and how logging affects sediment storage and transfers. Both fluvial and debris flow transport of sediment occur in gullies, and the amount of fluvial transport of sediment which occurs will affect the magnitude …
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Modelling the Holocene evolution of coastal gullies on the Isle of Wight
… case study focused on a specific set of coastal gullies found on the Isle of Wight, UK. A key factor in the evolution of these gullies are the relative balance between rates of cliff retreat (which reduces gully extent) and headwards incision caused by knickpoint migration (which increases gully …
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Debris flows on Earth and Mars
… near-surface water budget by studying recent gullies visually similar to water-carved gullies on Earth. The potential involvement of debris flow in forming these gullies is important, because it implies the action of liquid water. To assess the role of debris flow in forming martian gullies …
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Studying signatures of water on Mars at two macro and micro scales : orbital analyses of hillslope geomorphology and ChemCam calibration for surficial rock chemistry
… a debris flow initiation hypothesis for martian gullies was performed. Measurements of the contributing areas and slope gradients were made at the channel heads of martian gullies seen in three high resolution image stereo pairs. Our results show an area-slope relationship for these martian …
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Topographic and material controls on the Scottish debris flow geohazard
… slopes and a high incidence of concavities, gullies and couloirs are topographically more predisposed todebris flow activity due to greater shear stresses and morphologically controlled, gravity induced concentrations of hillslope hydrology. The majority of material in channelised debris …
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Understanding gully process in two Kansas landscapes
Gullies often form as a result of land use changes and associated factors such as soil compaction, vegetation removal and changes in rainwater infiltration. Gully erosion creates human safety hazards, soil loss, and sediment and nutrient pollution downstream. Across the globe, researchers have …
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Bedforms and Gravity Underflows in Marine Environments
… and (2) systems of subparallel, longitudinal gullies that are commonly observed in continental slopes. Combined analytical and experimental evidence supporting the argument that supercritical density and turbidity currents can develop long-wavelength, upstream-migrating bedforms is presented …
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Factor influencing headcut migration within a cohesive Texas Black-Land gully.
… influencing headcut development in cohesive gullies, mainly due to the limitations posed by field instrumentation and the high shear strength of clay soils. Cohesive gullies, e.g. those found in Vertisols may be regarded as an end member gully types in erosion studies. As such, critical …
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Assessing the impacts of riparian land use on gully development and sediment load : a case study of Nzhelele River Valley, Limpopo Province, South Africa
… connection which associates the development of gullies to various land use activities determines the amount of sediment load. These results are consistent with other previous research and suggest that land use activities is likely to exacerbate the development of gullies and sediment load in the …
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Recent fluvial geology in western North Dakota
… began in the middle or late 1800's. Many of the gullies were partially or entirely filled during the deposition of the upper alluvial unit and new gullies have been trenched to their present depth since approximately 1936. </p><p> The periods of valley filling in western North Dakota were …
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Land degradation in the Cathedral Peak area of the Natal Drakensburg : 1945 to 1992
… forests, eroded areas or surfaces and gullies and drainage density. The results show that for number of homesteads and cultivated area in the Cathedral Peak Area, there has been an exponential (geometric) and constant (arithmetic) increase respectively during the period under …
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The geology of the diamondiferous inner shelf off Namaqualand between Stompneus Bay and White Point just north of the Buffels River
… with NNE-SSW- and NNW-SSE-trending strike-gullies (Acoustic Facies 1) occurs mostly at >30m depth and also around reefs at Stompneus Shoal and Penguin Rock. Low micro-relief bedrock with sediment-filled strike-gullies, also trending NNE-SSW and NNW-SSE (Acoustic Facies 2) , delineates the …
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The Ahipara gumfields
… fires occur, pockets of bush survive in the gullies and sandhills stretch from Tuaroa Peak 201 metres down to the sea, the area as a whole having an atmosphere of true wilderness.
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Caracterização geomorfológica e do meio físico da folha Itapororoca 1:25.000.
… susceptible to the formation of ravines and gullies, damming of river channels and degradation of riparian forests.
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Analysis of gully erosion as a hydro-geomorphological hazard in Thulamela Municipality, Limpopo Province, South Africa
… was tracked through interpolation. Sampled gullies were overlaid to assess their size and shape transformation over time to determine the severity of gully erosion. Land use/cover changes were classified to track how they influenced gully development over the 15-year period. Topography was …
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Submarine channelforms and fans in the Miocene Moki and Mount Messenger formations, Taranaki Basin, New Zealand
… sediment conduits (i.e. canyons, channels and gullies) in seismic reflection profiles. Past studies considered that these conduits pass through submarine fans, while in reality fans occur basinward of the mouths of the sediment conduits. This thesis study leverages seismic reflection data and …
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Submarine Geomorphology of the Continental Shelves of Southeast and Southwest Greenland from Olex Data
… utilised. Turbidity current-channel systems and gullies on the continental slopes, and moraines on the continental shelf edge of Southern Greenland indicate that the Greenland Ice Sheet extended to the continental shelf edge during the LGM. Drumlins and crag-and-tails, located in troughs, suggest …
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Object-based image analysis for detecting landforms diagnostic of natural hazards
… landforms diagnostic of natural hazards, such as gullies, dunes, lava fields, landslides and snow avalanches, as these landforms tend to be more heterogeneous than the surrounding landscape. A single roughness metric is often limited in such detections; however, a more complex approach that …
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Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia
… Diamond trapsites in the form of potholes and gullies are incised into palaeo platforms formed during the sea-level stillstands. The marine erosion palaeo-platforms have been cut into the predominantly siliciclastic rocks of the Gariep Belt. The Late Proterozoic Gariep Belt is divided into an …
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Created Ponds as Indicators of Restored Sierra Nevada Meadow Hydrology
… with its historic floodplain and dams eroded gullies, which then fill with water, creating a series of ponds. Elevated groundwater tables and stream flooding return natural function and wet-meadow vegetation. Little research has examined the impacts of these anthropogenic ponds on the …
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