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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 107 for “"Resuspension"”.
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Emergency phase, mechanically induced, particle resuspension and resuspension stabilization
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Sediment resuspension in Boston harbor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Sediment resuspension in a shallow lake
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1987.
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Laminar viscous resuspension in two-dimensional channels
The laminar viscous resuspension of sphere particles in two-dimensional channel with gravity and electrostatic effects is studied numerically. The constitutive equation for particles include the shear-induced diffusion flux, gravitational sedimentation flux and electro-static diffusion flux. In …
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In situ characterization of sediment oxygen demand across the spectrum of non-resuspension to full resuspension with varying bed shear stress
… conditions are such that the impact of sediment resuspension on SOD is not considered. However, in the case of Bubbly Creek in Chicago, Illinois, the prevailing slack water conditions are interrupted by infrequent intervals of very high flow rates associated with pumped combined sewer overflow …
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Moveable bed roughness and sediment resuspension in the field
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Modelling of radioactive particle resuspension after a dirty bomb event
… a 10 m wind chamber unveiled average bin-by-bin resuspension factors for particle sizes between 0.9 and 6.5 μm downstream from the initial fallout. Calculated values were 4.12E-05 × (1 ± 46.8%) m-1 and 4.56E-05 × (1 ± 79.5%) m-1, indicating the magnitude of the resuspension process. In a …
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Use of a convective emission chamber to study particle resuspension
… C),$ and relative humidity (30-80%). Particle resuspension rates were measured with a laser based optical particle counter for various combinations of environmental conditions with and without the presence of mechanical disturbance of the source. The resuspension rates for the various …
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A Simple Computational Model for Particle Resuspension Behind a Normal Moving Shock
The simulation of particle resuspension from a surface due to shock passage and subsequent piston flow presents a means to analyze the post-shock conditions of an environment, such as after a dirty' bomb is detonated. This computational model is based on the 'Rock'n Roll' models of particle …
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Composition and characteristics of particles in the ocean : evidence for present day resuspension
… verifies the occurrence of local, present-day resuspension in the deep sea. The location of the major portion of this work was the South Iceland Rise, a region influenced by the flow of Norwegian Sea Overflow Water. Measured current velocities exceeded 20 cm/sec in the axis of the bottom …
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Sediment Resuspension in a Microtidal Estuary: Causative Forces and Links with Algal Blooms
… economies. To investigate the causes of sediment resuspension in a shallow, tidal system and the potential role of sediment resuspension on algal production, time-series measurements of current velocity, wave height, and suspended sediment concentrations were recorded using acoustic, optical, and …
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Experimental Study of Pathogenic Microorganism Resuspension from Mobile Bed Sediment in Irrigational Canals
… water or attachments to sediment particles. The resuspension of pathogens from bed sediment in irrigation canals impairs the quality of overlaying water and can result in the contamination of fresh produces. Sediments are known to be potential reservoirs of pathogenic microorganisms. Pathogens’ …
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Composition and characteristics of particles in the ocean : evidence for present day resuspension
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980.
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Small-Scale Resuspension and Redistribution of Surface Sediments in the Northeast Gulf of Mexico
… Erosion experiments performed in a closed-loop resuspension flume were completed on 23 sediment cores collected from near the Macondo wellhead and areas to the SE. Using flow modeling of the Gulf of Mexico, core sites were chosen to be in areas where erosion or deposition is thought to be the …
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Modeling The Impact Of Sediment Resuspension And Flocculation On The Fate Of Polychlorinated Biphenyls
… associated with flocculated particles during a resuspension event. The model is effective in predicting transport of hydrophobic organic contaminants among different size flocs, water, and two sediment layers. The model also demonstrates the impact of fractal geometry, bottom shear stress, …
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Developing a method to sample potential resuspension of radioactive contaminants near the former Rocky Flats Technical Plant
… has raised public concern for the potential resuspension of radioactive surface contamination to the now-populous areas surrounding Rocky Flats. Air sampling during specific conditions such as high winds, naturally occurring wildfires, and controlled burns would provide valuable data to …
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Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
In order to examine the importance of sediment resuspension on the sediment bed-to-water column transport of hydrophobic organic contaminants (HOCs) in the lower Hudson Estuary, the following areas of research were pursued: 1) a passive, in situ sampler, a polyethylene device (PED), for measuring …
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THE IMPORTANCE OF PHYSICAL MIXING AND SEDIMENT CHEMISTRY IN MERCURY AND METHYLMERCURY BIOGEOCHEMICAL CYCLING AND BIOACCUMULATION WITHIN SHALLOW ESTUARIES
… experiments, the long-term effects of sediment resuspension on the fate, transport, and bioaccumulation of Hg and MeHg in shallow ecosystems. A bioenergetic-based model including sediment resuspension was developed to assess MeHg bioaccumulation into benthic and pelagic organisms under the …
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THE EFFECT OF RAIN ON INTERTIDAL ESTUARINE SEDIMENT TRANSPORT (VORTEX RINGS, OXYGENATION, DROP/SPLASH FEATURES, FECAL PELLETS)
… how raindrops may be acting as a sediment resuspension mechanism. Single-drop and multi-drop laboratory studies were conducted on the initiation of motion of sediment. Results indicate single vortex rings in a quiescent environment can initiate motion of sand-sized noncohesive sediment in …
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Bacterial and Sediment Transport in an Artificial Sand Bed Stream During Unsteady Flow
… field-induced storm hydrographs to determine resuspension rates of coliforms and their association with the movement of bed material. Six artificial storm events were created by varying discharge in a 0.63-m wide stainless steel flume with 2.5 m of the 8-m-long channel bed covered with 0.26 to …
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