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Showing 1 to 20 of 23 for “"acoustic Doppler velocimeter"”.
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Hydraulic Characterization of Mounded Gravel Fish Nests: Incipient Motion Criteria and Despiking Acoustic Doppler Velocimeter Data
… water flow velocities were measured with an acoustic Doppler velocimeter (ADV) in Tom's Creek, Blacksburg, Virginia, USA. ADVs are often used to collect in-situ turbulent velocity data. In almost all applications of ADVs, erroneous spikes are recorded during collection, which can …
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A novel trimodal sensor for eddy correlation measurements of benthic flux in aquatic environments
… benthic fluxes of dissolved oxygen, using an Acoustic Doppler Velocimeter (ADV) to measure water velocity and an oxygen microelectrode to measure concentration. Widespread application to a larger range of compounds is limited, however, by the lack of chemical sensors that are fast, small, and …
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Quantifying Uncertainty in Velocity-area Streamflow Measurements Under Non-ideal Conditions
… measurements were collected using an acoustic doppler velocimeter with verticals spaced every 0.1 m. Measurements were sub-sampled to investigate the effect of sampling frequency on total uncertainty. All three methods compared well under near-ideal conditions but diverged for sites …
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Experimental Investigation of Steady Flows at a Breached Levee
… field are measured by a point gauge and an Acoustic Doppler Velocimeter (ADV), respectively. Time-averaged measured values of velocity field and free surface elevation are presented. In addition, Froude Number, turbulent kinetic energy (TKE) and bed shear stress are computed from the …
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The Influence of Bank Vegetation on Flow Structure Within a Small Agricultural Stream: Implications for Channel Stability
… was collected at seven cross sections using an acoustic Doppler velocimeter. The analyses of contour and vector plots of velocity, turbulent kinetic energy, and shear stress for each cross section has revealed that the dense overhanging grasses growing on the banks have effectively shifted the …
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Caracterización hidrodinámica de praderas naturales de macrófitos bentónicos en fondos someros afectados por mareas
… with a combination of in situ measurements (e.g. acoustic Doppler velocimeter (ADV) and dye tracer measurements) and flume tank experiments. Main results revealed that (1) the flow accelerates over the canopies, being partially explained by submergence conditions, (2) fragmentation of intertidal …
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Mean Flow and Turbulence Characteristics of Pool -Riffle Structures in Low -Gradient Streams
… Flow velocities were measured using an Acoustic Doppler Velocimeter on a very dense transverse grid at several cross sections. The high resolution of the velocity data (both in time and space) allowed for the identification of patterns of flow convergence and divergence, secondary …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
… experimental approach was adopted: (1) Acoustic Doppler Velocimeter (ADV) measurements quantified average velocities and turbulence parameters around three-square piers, revealing accelerated flow and reduced turbulent structures near critical regions. Numerical simulations using the …
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In the wake of a tidal turbine
… the wakes of scale model tidal turbines. An Acoustic Doppler Velocimeter (ADV) is used to profile the wakes of two turbines operating in six configurations: varying tip speed ratio, blade number, and including a device with contra rotating rotors. The wakes of various turbine configurations …
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Physical modeling of local scour around complex bridge piers
… field for each bridge model was measured by the acoustic Doppler velocimeter (ADV) to explain the complicated hydrodynamics of the flow field around bridge piers as guided by the results from a numerical model. In each physical model with river bathymetry, the comparison between the results of …
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Spectral feature classification of oceanographic processes using an autonomous underwater vehicle
… system is designed and built, using an Acoustic Doppler Velocimeter (ADV). The system is calibrated in a high-precision tow tank. In February 1998, the AUV acquired field data of flow velocity in the Labrador Sea Convection Experiment. The Earth-referenced vertical flow velocity is …
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Fish passage design for Southern Hemisphere small-bodied fish: Hydrodynamic and behavioural assessment using spoiler baffles
… A high-frequency flow measurement using an acoustic Doppler velocimeter (ADV) at grid spacing of 5 × 4 cm along the streamwise and lateral direction provided a small-scale hydrodynamic characteristic for each patch. Flow parameters such as velocities, turbulent kinetic energy, Reynolds …
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Spectral feature classification of oceanographic processes using an autonomous underwater vehicle
… system is designed and built, using an Acoustic Doppler Velocimeter (ADV). The system is calibrated in a high-precision tow tank. In February 1998, the AUV acquired field data of flow velocity in the Labrador Sea Convection Experiment. The Earth-referenced vertical flow velocity is …
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Boundary Shear Stress Along Vegetated Streambanks
… Velocity profiles were measured using an acoustic Doppler velocimeter (ADV) and a miniature propeller (MP). A flush-mounted Dantec MiniCTA system was used to measure shear stress at the streambank wall. The addition of vegetation on a sloping streambank increased the streamwise free stream …
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The influence of channel-skewed bedforms on flow structure in a high-amplitude meandering channel
… flow structure was measured using a Profiling Acoustic Doppler Velocimeter (PADV). Results show the strong influence of the point bar and channel-skewed roughness elements on flow structure within the Kinoshita channel. In contrast to the flatbed condition, large transverse flow separation …
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Free-surface turbulence and air-water gas exchange
… and air--water gas-exchange studies. A series of acoustic Doppler velocimeter, PIV, and infrared imaging experiments are presented that characterize the flow for the grid forcing conditions studied. Results indicate that the flows are stationary and reasonably repeatable. In addition, the flows …
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Computational fluid dynamics (CFD) and physical modelling of a metal refining process
… to predict vortex was also validated. An Acoustic Doppler Velocimeter (ADV) probe was used for the velocity measurement at various locations inside the water model and this gave valuable insight about the flow phenomena occurring inside the refining kettle. A particular important finding …
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Turbulence structure of a model seagrass meadow
… and turbulent velocity fields with the use of an acoustic Doppler velocimeter and a laser Doppler velocimeter. Standard turbulence parameters were evaluated including the velocity moments, the turbulence spectra. the turbulent kinetic energy budget and the quadrant distribution of the Reynolds …
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Development of an experimental framework for hydrodynamic characterization of hydrokinetic turbines in laboratory facilities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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The fluvial dynamics of compound meander bends
… loop over an 11-year period, coupled with Acoustic Doppler Velocimeter (ADV) measurements of 3-D instantaneous velocities for similar magnitude flows at the beginning and end of this period. Results confirm that this compound loop is highly dynamic with major changes in planform occurring …
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