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 67 for “"erosion rate"”.
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Downstream suspended sediment dynamics of reservoir sediment flushing
… The temporal scale of impacts on macro-invertebrates could span from few weeks or a month to several months while the effect on fish could last for a number of years. The impacts on downstream vegetation dynamics is driven by many years of flushing activities. The study also enabled proposing …
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Effect of water temperature on cohesive soil erosion
… />effect of water temperature on cohesive soil erosion should be explored. The objectives of this study are to: determine the effect of water temperature on the erosion rates of clay; determine how erosion rates vary with clay mineralogy; and, explore the relationship between zeta potential and …
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The erosion of materials
Solid particle erosion tests of glass, stainless steel, WC-Co and sintered alumina, have been performed with seven erodents using a range of particle diameters D (63 μm - 1000 μm), velocities V (33 m.s⁻¹ - 131 m.s⁻¹ ) and impact angles α (30° - 90°). The seven erodents are steel shot, glass beads, …
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The solid particle erosion of WC-Co alloys
An investigation involving the erosion of WC-Co alloys by solid particle impact erosion was undertaken to determine the mechanism by which material is removed. For this purpose a simple particle-gas stream erosion apparatus was employed. The nineteen different WC-Co alloys studied were initially …
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Efficacy of operational stream crossing best management practices on truck roads and skid trails in the Mountains, Piedmont, and Coastal Plain of Virginia
… Piedmont, and Coastal Plain of Virginia. Erosion rates of stream crossing approaches were modeled using the Universal Soil Loss Equation modified for forest lands (USLE-Forest) and Water Erosion Prediction Project (WEPP) methodologies. Implementation ratings (BMP-, BMP-standard, BMP+) were …
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Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils
… United States, the annual cost of on-site soil erosion problems such as soil and nutrient losses, and off-site soil erosion problems such as sedimentation of lakes and river, loss of navigable waterways, flooding and water quality impairment, has been estimated at 44 billion USD (Pimentel, 1995; …
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The use of detrital mineral thermochronology to explore relationships among climate, erosion, and tectonics in the Nepal Himalaya
… models of orogenic growth suggest that erosion can focus deformation in active convergent orogens, leading to a debate over the relative influence of climatic and tectonic forcing on erosion. In this thesis, geologic and observations, thermochronology, and thermo-kinematic numerical …
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THE PACE AND TIMING OF CHANGING LANDSCAPES AS VIEWED THROUGH COSMOGENIC RADIONUCLIDES: SYNTHETIC AND REAL EXAMPLES FROM THE CENTRAL ANDES AND AMAZONIA
… quartz crystals at a relatively well-constrained rate due to the bombardment of the Earth’s atmosphere by cosmic rays. Since the early 90’s, many studies utilized 10Be and 26Al to determine the pace and timing of vertical changes, or absence thereof, to the uppermost meters of the Earth’s surface. …
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Beryllium-10 derived erosion rates from the Hangay Mountains, Mongolia: landscape evolution in a periglacially-dominated continental interior
… been used as a way to determine basin-average erosion rates around the world. These erosion rates are useful to geomorphologists investigating landscape evolution. The Hangay Mountains in Mongolia are a prime location to use beryllium-10 because of the granitic rocks that provide the quartz …
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CFD modelling of pipe erosion under multiphase flow regimes.
Pipe erosion due to sand transport can have an adverse effect on the production efficiency of pipe-lines and other related flow systems. Proper knowledge of the flow characteristics, particle behaviour and geometric effects is very important in the accurate prediction of erosion rates and location. …
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Influence of Geotechnical Properties on Sediment Dynamics, Erodibility, and Geomorphodynamics in Coastal Environments Based on Field Measurements
… for estimating initiation of motion and erosion rates. Here, it is postulated that improving the ability to measure geotechnical sediment properties in energetic foreshore environments can improve our ability to predict coastal response to climate change. Through a series of field …
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Cenozoic tectonic and geomorphic evolution of the Red River Region, Yunnan Province, China
… margin. Cosmogenic ²⁶A1 and ¹⁰Be basin-wide erosion rate and burial ages indicate a background incision rate of [approximately] 0.05 to 0.10 mm/a, lower than the long-term incision rate minimum of [approximately] 0.26 mm/a. Cosmogenically-determined incision rate approximately doubles to …
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The influence of hydrodynamics on the growth, erosion and biomechanical properties of Laminaria digitata
… as the kelp Laminaria digitata are found in temperate waters growing in the low intertidal region along energetic coastlines exposed to a range of hydrodynamic environments. The influence of water motion on fundamental processes such as growth, erosion and the mechanical properties of kelp has …
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The Solid Particle Erosion of Polycrystalline Diamond at High and Low Temperatures
… presented in this thesis, solid particle erosion (SPE) has been used to simulate wear in freestanding PCD discs. The objective was to investigate how PCD responded to SPE over a range of conditions and at both ambient and high temperatures. Experiments were performed on three monomodal …
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Characterizing channel migration habits, sediment-transport capacity and flow dynamics in peatlands: an example from Cedar Creek, Minnesota U.S.A.
… the properties that influence migration rate of channels in peat-dominated landscapes by analyzing flow characteristics, substrate composition, and migration habits of Cedar Creek in central Minnesota and the peatland through which it flows. Two main reaches of the creek were selected as …
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Development of a Ground Based Atomic Oxygen and Vacuum Ultraviolet Radiation Simulation Apparatus
… materials simultaneously, resulting in an accelerated erosion rate. An apparatus has been developed in California Polytechnic State University’s, Cal Poly’s, space environments laboratory that can simulate the AO and VUV environments individually and simultaneously. This apparatus utilizes a …
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The tribological behaviour of a high nitrogen manganese austenitic stainless steel
… were abrasion, abrasion-corrosion and cavitation erosion. The high nitrogen alloy contained 0.63wt% nitrogen and 0.83wt% nickel and was found to have mechanical properties superior to the other steels studied in this thesis. This alloy was also subject to cold deformation and strain ageing and the …
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Studies of plasma potential measurements using an ion-sensistive probe
… (SOL) in the tokamak is a key indicator of the erosion rate of the plasma facing component (PFC) material. The Alcator C-Mod SOL plasma potential is currently measured by emissive probes, which is an established potential diagnostic, yet the probes are fragile and short-lived. The ion-sensitive …
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Modeling enhanced impurity sputtering due to rf sheaths in front of ICRH actuators
… estimate of the impurity fluxes and of the gross-erosion rate is provided for ITER-relevant conditions.
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The erosion of metals
The study of the erosion of metallic surfaces by solid particles has been an area of dispute recently (1980) especially concerning the importance of target melting as a mechanism for the removal of material. In addition, erosion by particles at a normal angle of impingement has remained unexplained …
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