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 22 for “"Sand Transport"”.
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Observations and modeling of sand transport in a wave dominated environment
… water velocities were used to examine sediment transport processes at the sandy LE0-15 site located off the New Jersey coast. The bedforms were observed during storms using a rotary sidescan sonar and were found to be wave orbital scale ripples. The onshore migration of these ripples was forced …
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Sand transport in Chioggia Inlet, Venice Lagoon and resulting morphodynamic evolution
The magnitudes and pathways of sand transport in Chioggia Inlet, southern Venice Lagoon, and the resulting morphological evolution have been investigated. Bathymetric analysis has established that there is a net export of sediment from the southern Lagoon Basin, and that significant morphodynamic …
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Observations and modeling of sand transport in a wave dominated environment
Thesis (Ph. D.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), 1998.
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Sand transport in northern Venice Lagoon through the tidal inlet of Lido
The provenance and transport of sand has been investigated around Lido Inlet, the largest of<br/>three tidal inlets in Venice Lagoon, Italy. Morphological analysis has established the presence<br/>of an ebb-tidal delta extending from the mouth of Lido Inlet as well as other features typical<br/>of …
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Experimental study of sand transport and deposition in a high-velocity surge
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1981.
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Computational fluid dynamics (CFD) modelling of critical velocity for sand transport flow regimes in multiphase pipe bends.
The production and transportation of hydrocarbon fluids in multiphase pipelines could be severely hindered by particulate solids deposit - such as the sand particles that can accompany hydrocarbon production. Knowledge of the flow characteristics of solid particles in fluids when transported in …
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Large Eddy Simulations of Sand Transport and Deposition in the Internal Cooling Passages of Gas Turbine Blades
… particulate matter can be ingested, especially, sand, ash and dirt. Particulate matter in different engine components can lead to degradation in performance. The objective of this dissertation is to investigate sand transport and deposition in the internal cooling passages of turbine blades. A …
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Landscape scale measurements of wind erosion of volcanic materials in the Hekla area
… of the present study were to i) measure aeolian sand transport on a landscape scale, ii) to estimate the effect of environmental factors on sand transport and iii) estimate the effect of reclamation efforts on wind erosion. The research area, north of Hekla in South Iceland, extends approximately …
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Modelización de la evolución morfodinámica de la duna de Valdevaqueros (t.m. Tarifa) mediante la aplicación de funciones empíricas ortogonales a corto, medio y largo plazo
… Tarifa meteorological station. Furthermore, a sand trap was placed on three different dune profile areas during 30 min, obtaining that the sand transport at the crest was twice the amount of the sand collected at the windward and near six times greater than the sand measured at the dune foot. …
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Sediment Transport and Wind Flow Around Hummocks
… vegetation density, shear stress and sediment transport surrounding hummocks, a type of small dune. While qualitative observations and holistic, large-scale experiments regarding vegetation density and sediment transport have confirmed a negative correlation, fewer papers have quantitatively …
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Numerical Modeling of River Diversions in the Lower Mississippi River
… Numerical modeling of hydrodynamics and sediment transport of the MR is a useful tool to evaluate restoration projects and to improve our understanding of the resulting River response. The emphasis of this study is on the fate of sand in the river and the distributaries. A 3-D unsteady flow …
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Response of the Texas coast to global change: Geologic versus historic timescales
… mechanisms of erosion reveals several sand sources and sinks along the upper Texas coast. It appears that hurricane washover and offshore sand deposits are minimal sand sinks, while flood-tidal deltas are areas of significant sand sequestration. Additionally, it appears that damming of …
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Modelling fine sediment transport over an immobile gravel bed
… represents a significant component of the total transport load in most fluvial systems around the world that are not limited to the alluvial rivers with sandy beds. A variety of natural or human actions, such as fire, logging, flow diversion, road construction, and urban or agricultural …
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Aeolian sand movement in an arid linear dune ecosystem, Nizzana, Western Negev, Israel
In a three-year study the current aeolian transportation processes were examined in a linear dune area previously used for grazing near Nizzana at the Israeli-Egyptian border. The research area was subject to heavy grazing across the border, which led to the total destruction of the natural …
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Small Scale Aeolian Processes and Landform Response
… those grains on the surface can be moved. The transported grains exchange momentum with fluid flow, interact with the surface, and then finally settle down when the wind strength becomes too weak to maintain their motion. The deposited grains produce various landforms from centimeter-scale sand …
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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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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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Modeling multiphase solid transport velocity in long subsea tiebacks: numerical and experimental methods.
Transportation of unprocessed multiphase reservoir fluids from deep/ultra-deep offshore through a long subsea tieback/pipeline is inevitable. This form of transportation is complex and requires accurate knowledge of critical transport velocity, flow pattern changes, phase velocity, pressure drop, …
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Wave-induced sediment transport on an estuarine intertidal flat
… way in which these control estuarine sediment transport, is lacking. The aim of this thesis is to redress this deficiency. Wave, current and suspended-sediment meters were deployed along a 1600-m-long cross-shore transect of the Wiroa Island intertidal flat (Manukau Harbour, New Zealand) for a …
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