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Showing 1 to 20 of 73 for “"ADCP"”.
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Understanding longitudinal ADCP measurements to determine water velocities for open channel flow
… longitudinal acoustic Doppler current profiler (ADCP) measurement approach as an alternative to the present ADCP measurement practice (collecting stationary measurements or measurements along transects). The growing need for precisely interpolated velocities at all points throughout a river reach …
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An ADCP study of subtidal scale density-driven exchange in Saldanha Bay, South Africa
An ADCP and water-column temperature study was conducted to determine the circulation aspect of subtidal-scale, density-driven exchange in Saldanha Bay, South Africa. Density-driven exchange conditions develop in response to synoptic-scale wind events in the southern Benguela region, even under …
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Error and uncertainty in estimates of Reynolds stress using ADCP in an energetic ocean state
… However, the Acoustic Doppler Current Profiler (ADCP) looks at radial wavenumbers and frequencies, and finds overlap. Another approach is to exploit the physical differences of each process, namely that the wave induced velocities are correlated over much larger distances than the turbulence …
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Error and uncertainty in estimates of Reynolds stress using ADCP in an energetic ocean state
(cont.) To that end, the space-time correlations of the error, turbulence, and wave processes are developed and then utilized to find the extent to which the environmental and internal processing parameters contribute to this error. It is found that the wave-induced velocities, even when filtered, …
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Ecosystem impacts of variable recruitment in Antarctic krill investigated with long-term monitoring and archived ADCP backscatter data
… data from an Acoustic Doppler Current Profiler (ADCP) to investigate biotic and abiotic drivers of summer krill distribution along the mid-to-coastal shelf region of the western Antarctic Peninsula.In Chapter 1, my coauthors and I examine the impact of cyclical krill recruitment on Adélie …
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Characteristics of near surface circulation patterns in the Benguela as derived from the ADCP(Acoustic Doppler Current Profiler).
… objective is to implement effective and quality ADCP data collection in the Benguela region. The thesis has two main components, firstly it undertook to investigate and assess the data quality, processing methods and software of ADCP data that are used to collect and process the ADCP data …
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An Efficient Method for Measuring the Dispersion Coefficient in Rivers
… with an acoustic Doppler current profiler (ADCP) to estimate the longitudinal dispersion coefficient K is evaluated. If shear dispersion controls mixing, the dispersion coefficient can be estimated from a theoretical formula involving velocity measurements in a cross section. K has typically …
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Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which limit its capabilities for measuring deep water waves. By employing an …
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Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which limit its capabilities for measuring deep water waves. By employing an …
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Use of numerical simulations to investigate the performance of a virtual acoustic Doppler current profiler in characterizing flow
… of a virtual acoustic Doppler current profiler (ADCP) in characterizing flow fields and mean velocity profiles from stationary and moving platforms. This was accomplished in part using a data set with high temporal and spatial resolution from a direct numerical simulation of turbulent open …
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Strategien zur Verstärkung der antikörpervermittelten Effektorzellaktivierung beim Multiplen Myelom
… die antikörperabhängige zelluläre Phagozytose (ADCP) leisten nachweislich einen wichtigen Beitrag zur Effektivität des CD38-Antikörpers Daratumumab. Im Rahmen dieser Arbeit wurden Strategien zur Verstärkung dieser Wirkmechanismen entwickelt, um die CD38-gerichtete Myelomtherapie zu verbessern. …
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Evaluation of the operational Mercator Global Ocean analysis and forecast system modelled current vector product with in-situ ADCP data in the Southern Benguela upwelling system
… gathered by Acoustic Doppler Current Profilers (ADCP). In this study, an upward-facing Nortek Signature 250 ADCP was deployed at a depth of 123 m off the Southern Namibian coast for ten months. The resulting current profile data were used to validate the Mercator data product for the same area. …
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Vertical Distributions of Zooplankton at the Mouth of Chesapeake Bay and Calibration of Backscatter From an Acoustic Doppler Current Profiler
… data from acoustic Doppler current profiler (ADCP) backscatter. A single site was occupied in the North Channel at the mouth of Chesapeake Bay (37° 04' N, 75° 58' W) from 17.0–19.7 November 1999. Temperature, salinity, fluorescence, light transmission, current velocity and backscatter were …
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Sill Overflow Processes in the Philippine Archipelago
… Moored Acoustic Doppler Current Profiler (ADCP), Conductivity, Temperature, Depth (CTD), and lowered ADCP (LADCP) data are used to study the currents and stratification at Panay Sill, at the southern end of Mindoro Strait. We observe a strong bottom-intensified overflow; temporal mean …
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High Resolution Measurements of the Mean Three-dimensional Flow Field in a Natural River
… boat-mounted acoustic Doppler current profilers (ADCP) are increasingly used in field studies to quantify flow features including mean velocity, boundary shear stress, and sediment motion. Two survey procedures are typically employed with an ADCP. Moving-vessel (MV) measurements provide …
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Quantifying Near-Bank Turbulence Through a Storm Event
… velocity was measured using a Sontek SL3000 (ADCP) at baseflow and through a storm hydrograph at an experimental cross-section (West Run in Morgantown, WV). Velocity was measured (2 min sample time at 25 Hz) and stream stage was recorded every seven minutes with the ADV throughout a 17 hour …
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A study of flow structures in a two-stage channel using field data, a physical model and numerical modelling
… flow. An Acoustic Doppler Current Profiler (ADCP) was used to measure the spatial distribution of velocity in two cross sections of a small meandering river (River Blackwater, Hampshire) during inbank, bankfull and overbank flow conditions. The same reach of the river had been previously …
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Current velocity profiling from an autonomous underwater vehicle with the application of Kalman filtering
… made by an Acoustic Doppler Current Profiler (ADCP) borne by an Autonomous Underwater Vehicle (AUV). Compared with conventional approaches, current profiling from an AUV platform has advantages including three-dimensional mobility, rapid response, high-level intelligent control, independence …
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The structure of the Kuroshio west of Kyushu
A triangular CTD/ADCP survey was made across the Kuroshio west of Kyushu aboard the R/V Thompson during January, 1986 in order to investigate the water properties and flow field in the Kuroshio. A similar CTD survey was made in July, 1986 aboard the R/V Washington to study the seasonal variability …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
Acoustic Doppler current profilers (ADCPs) use active sonar to measure current velocities by measuring the sound returned by scatterers (most often zooplankton) in the water column. The volume of scatterers, or echo intensity, has been used to measure the abundance of zooplankton and characterize …
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