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Showing 1 to 20 of 28 for “"Sediment Resuspension"”.
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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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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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Sediment Resuspension in a Microtidal Estuary: Causative Forces and Links with Algal Blooms
… resting cysts that accumulate in the bottom sediments and are thought to provide seed populations for future algal blooms when they are resuspended. When estuarine sediments are advected from a bed, other materials, such as pollutants, nutrients, and organic matter are also released into the …
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Modeling The Impact Of Sediment Resuspension And Flocculation On The Fate Of Polychlorinated Biphenyls
… (PBDEs). Sorption to resuspended particles and sediments plays an important role controlling the water column residence times and spatial distributions of HOC in aquatic environments. Pollutant residence times and the time required to reach sorptive equilibrium are highly dependent on the …
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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
… mesocosm 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 …
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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
Sediment oxygen demand (SOD) can be a significant oxygen sink in various types of water bodies, particularly slow-moving waters with substantial organic sediment accumulation. In most settings where SOD is a concern, the prevailing hydraulic conditions are such that the impact of sediment …
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Mechanisms of metal release from contaminated coastal sediments
The fate of trace metals in contaminated coastal sediments is poorly understood, yet critical for effective coastal management. The aim of this thesis is to investigate and quantify the mechanisms leading to the release of silver, lead and copper across the sediment-water interface. Two contrasting …
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Modeling temporal and spatial variations in dissolved oxygen in Amite River
… in lowland rivers with organic-rich fine-grained sediment. The modeling framework is based on three major contributions/new models, including (1)VART-DO model for improved estimation of reaeration coefficient (K2) in natural streams, (2)VART-DOS model for simulation of temporal variations in DO in …
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Sediment erosion and deposition within mangrove forests
… in their own biomass and by trapping carbon-rich sediment imported from outside the forest and deposited in the forest. Aboveground biomass, like mangrove pneumatophores (i.e., aerial roots), creates conditions that facilitate sediment deposition by enhancing drag and slowing currents near the …
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Sediment Erosion and Deposition Within Mangrove Forests
… in their own biomass and by trapping carbon-rich sediment imported from outside the forest and deposited in the forest. Aboveground biomass, like mangrove pneumatophores (i.e., aerial roots), creates conditions that facilitate sediment deposition by enhancing drag and slowing currents near the …
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Investigation factors that control trace metal toxicity in coastal systems : a temporal and spatial analysis of kinetically inert copper in Boston Harbor
… solids at one sampling location suggested that sediment resuspension may be a source of inert Cu to coastal waters. Consistently significant inert Cu concentrations at a site near a salt marsh implied that the presence of sulfides may result in formation of inert Cu. No correlation between inert …
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Analytical and experimental studies of plant-flow interaction at multiple scales
… levels within the canopy set water renewal and sediment resuspension. We consider both steady currents and wave-induced flows. For steady flows, the flow structure is significantly affected by canopy density. We define sparse and dense canopies based on the relative contribution of turbulent …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… on inner shelf circulation, transport, and sediment resuspension height. Thermal stratification above the bottom mixed layer is shown to cap the height to which sediment is resuspended. Stratification increases the transport driven by cross-shelf wind stresses, and this effect is larger in …
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The effect of stratification on wind-driven, cross-shelf circulation and transport on the inner continental shelf
… on inner shelf circulation, transport, and sediment resuspension height. Thermal stratification above the bottom mixed layer is shown to cap the height to which sediment is resuspended. Stratification increases the transport driven by cross-shelf wind stresses, and this effect is larger in …
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THE EFFECT OF RAIN ON INTERTIDAL ESTUARINE SEDIMENT TRANSPORT (VORTEX RINGS, OXYGENATION, DROP/SPLASH FEATURES, FECAL PELLETS)
… to understand 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 …
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Role of sediment oxygen demand on the oxygen balance in the North Shore Channel of Chicago
… factors contribute directly to the oxygen sink, sediment oxygen demand (SOD) is suspected of being a significant factor along slower-moving channels with substantial organic sediment accumulation. The North Shore Channel of Chicago is of particular interest due to the conditions of this waterway. …
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Sediment Deposition in the Deep Sea: from Seamounts to the Hadal Trenches
… by an additional food source originating from sediment resuspension. However, the mechanisms of resuspension at these depths remain uncertain.<br/>Two diverse environments with intermediate scale topographical features were studied: seamounts in the North Atlantic and Pacific hadal trenches …
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Thermodynamics and kinetics of hydrophobic organic compound sorption in natural sorbents and quantification of black carbon by electron microscopy
… of hydrophobic organic compounds (HOCs) in sediments were investigated using pyrene. Native pyrene desorbed slowly, taking from weeks to months to equilibrate. The end-point data suggested that, at nanogram-pyrene-per-liter porewater levels, sorption was much stronger than conventionally …
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