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Showing 1 to 20 of 27 for “"Laboratory flume"”.
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Suspended sediment erosion in laboratory flume experiments
Laboratory flume experiments are used to examine the role of suspended sediment abrasion in bedrock channel erosion. A range of topographies was used, from a planar bed to a sinuous and scalloped inner channel. Experiments were run separately with bedload (used to form topography) and suspended …
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Sedimentary processes on the continental slope off New England
… analysis, bottom photographs, television laboratory flume experiments, studies of surface sediments, and piston cores were combined to form the basis for understanding the sedimentary processes which control transportation, deposition, and erosion of sediments, and the geomorphic features …
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Flow and sediment properties influencing erosion of fine-grained marine sediments : sea floor and laboratory experiments
… sediments were studied by using an in situ flume to erode undisturbed bottom sediments on the sea floor in Buzzards Bay, a shallow marine embayment off the Massachusetts coast. Tte muddy sea floor in that area is characterized by a deposit-feeding infauna that reworks the sediments. …
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Longitudinal dispersion in vegetated flow
… and velocity measurements were conducted in a laboratory flume. Results show that the mechanism of exchange between the free stream and the vegetated region is critical to the overall dispersion, and is primarily controlled by the canopy density.
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Modeling the dynamics and depositional patterns of sandy rivers
… in sandy rivers. I use physical modeling in a laboratory flume to explore the feedbacks among bedform geometry, fluid flow and sediment transport. Field observations of dunes in the North Loup River, Nebraska, show that bed roughness displays a statistical steady state and robust scaling. …
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Sediment Transport Analyses and Development of a Hydraulic Computer Model for Desiging a Stable Vegetated Channel at Lost Lake
… locations within the watershed; 3) performing laboratory flume experiments on sediment samples; 4) developing a hydraulic computer model of the watershed using the US Army Corps of Engineers Hydrologic Engineering Center River Analysis System (HEC-RAS) software; and 5) the evaluation of various …
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Field and laboratory observations of small-scale dispersion in wetlands
… and longitudinal dispersion in both the laboratory and the field. Laboratory flume experiments were conducted using an emergent canopy of rigid cylinders with different cylinder densities over depth. Field experiments were conducted in a natural salt marsh. Drag due to local stem density …
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An assessment of Eddy Correlation technique in marine habitats
… in seagrass meadows and benthic organisms in the laboratory and field. Although EC has been used in aquatic system for over a decade, this system is still under development to gain robust results. According to its complexity, the EC and software used to analyse and calculate flux have been …
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Aquatic gravity currents through emergent vegetation
… case. Lock-exchange flows were generated in a laboratory flume with rigid cylindrical dowels as model vegetation. Experimental observations were consistent with the theory. Under high stem drag or low stem Reynolds number conditions, the interface deviated from the well-documented block profile …
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Mean Flow and Turbulence Characteristics of Pool -Riffle Structures in Low -Gradient Streams
Laboratory flume experiments were carried out to investigate the three-dimensional flow structure and turbulence characteristics of pools and riffles. The experiments included three different bed configurations: flat bed (FB), centered pools and riffles (CPR), and alternate pools and riffles (APR). …
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Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels
… incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the saltation-abrasion model (Sklar and Dietrich, 2004) for sediment flux-dependent channel incision guide our efforts although the …
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Turbulence and macro-turbulence in the bottom boundary layer downstream of large-scale bedforms; implications for sediment transport
… in a natural shallow coastal site and in a laboratory flume. The main signature of flow/bedform interaction processes consists of large scale flow structures, generated downstream of the bedforms; these are characterised by alternating modules of lower and higher streamwise speeds than the …
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Experimental study of reservoir turbidity currents venting
… a series of experiments were conducted on a laboratory flume to analyze the behavior of turbidity currents while using the pass-through sediment management technique of venting. The main focus was to explore and develop a better understanding of the streamwise flow velocity and suspended …
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Turbulence in geophysics: from rotating, ionized fluids to sediment transport
… Part II of this thesis, I use a combination of laboratory flume experiments and a simple stochastic model to capture the on-off intermittent statistics of bed load sediment transport near the threshold of motion. In Chapter 5 I use the stochastic model to estimate the threshold of grain motion …
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Getting out of the water and into the air: Understanding aerosolization of the bacterium Pseudomonas syringae from aquatic environments
… an Ice- strain of P. syringae under artificial laboratory conditions. The aerosolization of P. syringae was not influenced by water temperature between 5° and 30°C. In general, the culturability (viability) of P. syringae in aerosols increased with temperature between 5 and 30°C. The Ice+ strain …
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Numerical Solution of the One-dimensional and Cylindrical Serre Equations for Rapidly Varying Free Surface Flows
… are validated using an analytical solution, laboratory flume data and the simulation of the dam-break problem. Two hypothetical examples, one that includes bathymetry and the second involving the circular dam-break problem in two-dimensions, are also used to validate the computer programs. …
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Numerical Solution of the One-dimensional and Cylindrical Serre Equations for Rapidly Varying Free Surface Flows
… are validated using an analytical solution, laboratory flume data and the simulation of the dam-break problem. Two hypothetical examples, one that includes bathymetry and the second involving the circular dam-break problem in two-dimensions, are also used to validate the computer programs. …
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Experimental and numerical assessment of a tidal turbine control strategy
… testing a 1:30 scale model turbine in a laboratory flume tank. Using only the measurement of rotor speed as an input to the control system, the model turbine successfully tracked the maximum power condition in a time varying flow, before overspeeding to limit power and thrust in the …
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Exploring connections between seagrass ecosystem services and meadow hydrodynamics
… dissipation and carbon sequestration. First, laboratory studies and simulations were used to explore how plants interact with waves and currents with the goal of predicting wave dissipation and turbulence generation. The flexibility of a plant is critical in defining its interactions with the …
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Stream Discharge Measurement Using A Large-Scale Paticle Image Velocimetry Prototype
… test a prototype under varying conditions in a laboratory flume, adapt the prototype for field conditions, test the accuracy of the prototype in the field, and assess and recommend improvements for LSPIV operation as a stream discharge measuring device. The laboratory experiments results …
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