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  • 1
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    Woods Hole Oceanographic Institution
    Publication Date: 2022-05-25
    Description: A tall tripod equipped with two acoustic Doppler velocimeters (ADVs) was deployed at a water depth of 15 m off the coast of New Jersey near the LEO-15 site. Sensors were co-located near the bottom to provide good estimates of Reynolds stress. Thermistors were located within several centimeters of the velocity sample volume to provide simultaneously sampled estimates of turbulent temperature variance and vertical temperature flux. One of the ADVs was equipped with a pressure and a temperature sensor. A wave/tide gauge was placed at 4 meters above bottom. The instruments were deployed late July through early December of 2000 and late June through early August of 2001. For the 2001 deployment, a single beam acoustic Doppler velocity sensor (DopBeam) was added to measure high frequency vertical velocity variance and echo intensity within the bottom boundary layer. A second tripod was deployed nearby and was equipped with an array of LISST sensors and an MSCAT. The purpose of this report is to document the instrumentation and deployment of the tripods and to document the tall tripod data by providing a description of the processing and data formats, time-series summaries of the burst averaged data along with preliminary analyses.
    Description: Funding was provided by the Office of Naval Research under Contract No. N00014-99-1-0213.
    Keywords: Turbulence ; Stress ; HYCODE ; Endeavor (Ship: 1976-) Cruise EN342 ; Endeavor (Ship: 1976-) Cruise EN344 ; Endeavor (Ship: 1976-) Cruise EN347 ; Endeavor (Ship: 1976-) Cruise EN356 ; Endeavor (Ship: 1976-) Cruise EN358
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 3582726 bytes
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  • 2
    Publication Date: 2022-05-25
    Description: A field study was performed in the lower Hudson River, a partially mixed estuary with a relatively simple geometry (Figure 1), between August and October of 1995. The objectives of the study were (1) to quantify and characterize the turbulent transport of momentum and salt, and (2) to relate the turbulent transport processes to the local and estuary-wide dynamics. The measurement program consisted of fixed and shipboard components. At a central site, a moored array of temperature-conductivity sensors and optical backscatter sensors (OBS), a bottom-mounted acoustic Doppler current profiler (ADCP), and a bottom-mounted array of acoustic travel-time current sensors (BASS), temperature-conductivity sensors, and OBS sensors resolved the vertical structure of velocity, salinity and turbidity and the near-bottom turbulence structure. Moored and bottom-mounted velocity, temperature, conductivity and pressure sensors at five secondary sites quantified the spatial and temporal variabilty of velocity, salinity and bottom pressure. Shipboard measurements with an ADCP and a conductivity-temperature-depth (CTD) profiler, accompanied by an OBS sensor, resolved the spatial structure and tidal variability of velocity, salinity and turbidity along several cross-channel and along-channel transects. This report describes the measurements in detail. Section II describes the instrumentation, Section III describes the deployment and sampling schemes, Section IV describes the data processing, and Section V is a summary of plots of selected data. Section VI documents the data files and Sections VII and VII give acknowledgments and references.
    Description: Funding was provided by the National Science Foundation under Grant OCE-94-15617 and The Hudson River Foundation.
    Keywords: Stress ; Salt flux ; Mixed estuary
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 9092431 bytes
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  • 3
    Publication Date: 2022-05-26
    Description: To quantify and understand the role of vertical mixing processes in determining mid-shelf vertical structure of hydrographic and optical properties and particulate matter, the Office of Naval Research (ONR) funded a program called Coastal Mixing and Optics (CMO), which was conducted at a mid-shelf location in the Mid-Atlantic Bight, south of Martha's Vineyard, Massachusetts. As part of the CMO program, a tall tripod, called 'SuperBASS,' was equipped to collect a year-long, near-bottom time-series of velocity, temperature, salinity and pressure. The BASS sensors were modified to measure absolute as well as differential acoustic travel time, to provide sound speed (a surrogate for temperature) and velocity in a single sample volume. Seven BASS velocity and time travel sensors were placed between 0.4 and 7 meters above bottom. Three acoustic Doppler velocity (ADV) meters were mounted near the bottom-most BASS sensors at 0.3 meters above bottom. The sensors were used to obtain high-quality time-series measurements of velocity and temperature throughout a large fraction of the bottom bondary layer on the New England shelf. The measurements provide vertical structure of the Reynolds-averaged velocity and temperature fields, direct covariance estimates of turbulent Reynolds stress and turbulent heat flux, and indirect inertial range estimates of dissipation rate for turbulent kinetic energy and temperature variance. The purpose of this report is to describe the SuperBASS instrumentation and deployments, to provide summaries of the data collected, and to document the processing, preliminary analysis and archival of data collected for this component of the program.
    Description: Funding was provided by the Office of Naval Research under contract number N00014-95-1-0373.
    Keywords: Bottom boundary layer ; Stress ; Dissipation ; Oceanus (Ship : 1975-) Cruise ; Endeavor (Ship: 1976-) Cruise ; Seward Johnson (Ship) Cruise ; Coastal Mixing and Optics (CMO) Experiment
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 5482992 bytes
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