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 37 for “"Erosion processes."”.
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A quantitative analysis of shoreline erosion processes, Lake Sakakawea, North Dakota
<p> Shoreline erosion is a problem at Lake Sakakawea and Lake Audubon, North Dakota. Land is lost, water quality is adversely affected, and reservoir storage capacity is decreased. </p><p> Instrumentation of the eastern shores of both lakes began in 1983 to quantify bank erosion by process (e.g., …
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Scales of Bank Roughness and Their Relationship to Bank Erosion Processes
Stream bank erosion rates and the stabilization of channel width are poorly understood processes. There have been two distinct approaches to the study and prediction of bank erosion rates in natural streams. In order to predict bank shear stresses, scientists either define a reach as being …
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Linking soil erosion processes with arable weed seedbank dynamics to inform sustainable cropping
<p>Accelerated soil erosion affects sustainable food production through the degradation of arable soils resulting in lower crop yields and compromising biodiversity. Over the past 50 years, the weed seedbank has been declining due to farming intensification, increased herbicide use and weed …
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Evaluación de procesos de erosión en pistas forestales no pavimentadas: (Sistema Ibérico noroccidental, La Rioja)
… functioning, suggest an increase of erosion processes (both variety and intensity) and in sediment yield, particulary in those hill-roads that were built with low budgets, and carry heavy traffic and do not include even minimal conservation techniques. In the mountains of La Rioja, …
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Salt marsh substrate composition and responses to applied stress
… resistance of the marsh sedimentary platform to erosion is important, particularly as marsh edge erosion is common on many shores. This resistance is likely to be strongly influenced by marsh biological, geochemical and sedimentological/geotechnical properties. Currently there is little …
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Análise da evolução do uso e ocupação do solo e das perdas de solo na bacia experimental do riacho Guaraíra.
… and urban sprawl in watersheds has accelerated erosion processes. Before that problematic, this paper aimed at analyzing the evolution of the use and occupation and soil loss in the Guaraíra River Experimental Basin to 1974 and 2012, using remote sensing techniques, GIS software ArcGIS 9.3 and …
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Seasonal precipitation, river discharge, and sediment flux in the western Himalaya
… distribution of water resources and controls of erosion processes. In this thesis, I employ various methods to assess and quantify general characteristics of and links between precipitation, river discharge, and sediment flux in the Sutlej Valley. First, I analyze daily precipitation data …
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Comparing UAV and Pole Photogrammetry for Monitoring Beach Erosion
Sandy beaches are vulnerable to extreme erosion during large storms, as well as gradual erosion processes over months and years. Without monitoring and adaptation strategies, erosion can put people, homes, and other infrastructure at risk. To effectively manage beach resources and respond to …
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Climatic and geodynamic influences on ocean island geomorphology
… to understand controls on rates and patterns of erosion and the contribution of lithosphere and mantle processes to surface deformation at hotspots. Through physically-based modeling, analysis of remote sensing and geochronologic data, and field measurements, this thesis examines (1) the dominant …
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Adsorption–Desorption Reactions in the Weathering Zone: Implications for Silicate Weathering & the Carbon Cycle
… (CO2) from Earth's atmosphere. The tectonic processes of uplift, exhumation, and erosion modulate the negative feedback relationship between climate, silicate weathering rates, and atmospheric CO2 removal rates by controlling the exposure rate of unweathered minerals at the Earth's surface. …
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Stability of Coastal Cliffs along the Pembrokeshire Coast National Park
… Pembrokeshire Coast National Park has identified erosion processes, mechanisms and parameters. Map evidence has established spatial variability in long term (66 years) retreat rates between the various rock sections.The northern section between Cardigan and St. David's Head was stable with an …
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Variability of soil erodibility: its relationship to topography and soil properties in cultivated landscape
… is an important consideration when studying soil erosion processes in agricultural landscapes.
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Análise do risco à erosão do solo no município de Lucena - Paraíba.
The erosion processes are natural phenomena that occur in all environments, but the risk of soil destruction in Brazilian regions is very high due to the susceptibility of Brazilian soils to erosion. The soil loss in Brazil are derived from factors external geodynamics of the Earth, such as floods …
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Simulation and assessment of highly altered hydrologic system responses to anthropogenic and natural stressors at the watershed scale
… account for human activities and natural processes that provoke modification of an ecosystem and its behavior. These stressors are chemical, physical, or biological in nature and can have short- and long-term impacts on the ecosystem (EPA, 2017b). Watershed Management Practices (WMPs) are …
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Bedrock channel response to tetonic, climatic and eustatic forcings
… (i.e. steady-state fluvial incision), and (2) erosion processes are proportionally more effective in the high-uplift-rate zone, with factors in addition to channel gradient responding to tectonic forcing. These results lead to the rest of the study, in which some of the assumptions of the …
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The provenance of the norber erratics, and the formation of post-devensian-deglaciation pedestal rocks with carboniferous limestone pedestals in England, Ireland and Wales
… pedestal rocks. An examination of weathering and erosion processes at Norber, where only perched pedestal rocks with vertical sidewalls are found, revealed that lowering of the inter-pedestal limestone surface has taken place primarily in a sub-regolith karstic environment, and that little or no …
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Regenerative agriculture and soil carbon storage in the Upper Corn Belt
… agricultural mismanagement, and topsoil erosion have depleted global soil organic carbon (SOC) stocks in the top two meters of soil by an estimated 133 petagrams (Pg), resulting in a significant SOC debt. Regenerative cropping practices, such as no-till and cover cropping, are recognized …
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Denudation processes in a tectonically active rift on different time scales
… between extension, the build-up of topography, erosion and sedimentation can be evaluated in the context of landscape evolution. Rift basins also constitute important archives that potentially record the evolution and migration of species and the change of sedimentary conditions as a result of …
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The stability of coastal cliffs along a section of the Ceredigion coastline
… 20km of the West Wales coastline has recognised erosion processes and mechanisms. Cartographic evidence has established considerable spatial variability in long-term retreat rates between the solid rock sections and those of tills and glacial clays. Mean contemporary recession rates of 13cm yr1 …
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Geological, historical and present-day erosion and colluviation in Lesotho, southern Africa
… 10 metres, cover the lowlands of Lesotho. Gully erosion whilst removing the colluvial storages, and resulting in the degradation of the landscape, provides an opportunity to examine colluvial profiles. A genesis for the colluvium is sought in an attempt to understand the conditions of formation, …
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