U.S. Geological Survey (USGS) scientists and technical staff deployed instrumented underwater platforms and buoys to collect oceanographic and atmospheric data at two sites near Matanzas Inlet, Florida, on January 24, 2018, and recovered them on April 13, 2018. Matanzas Inlet is a natural, unmaintained inlet on the Florida Atlantic coast that is well suited to study inlet and cross-shore processes. The two study sites were located offshore of the surf zone, in 9 and 15 meters of water depth, in a line perpendicular to the coast. A sea-floor platform was deployed at each site to measure ocean currents, wave motions, acoustic and optical backscatter, temperature, salinity, and pressure. The objective was to quantify the hydrodynamic forcing for sediment transport and the response to such forcing near the seabed in the vicinity of an unmaintained inlet.
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This research was conducted as part of the U.S. Geological Survey Cross-Shore and Inlets Processes study of the processes controlling coastal sediment transport. The Skidaway Institute of Oceanography, University of Georgia, provided vessel and field support that were an essential part of this work. The officers and crew of the research vessel
Multiply | By | To obtain |
Length | ||
---|---|---|
centimeter (cm) | 0.39370 | inch (in) |
millimeter (mm) | 0.03937 | inch (in) |
meter (m) | 3.28100 | foot (ft) |
kilometer (km) | 0.62140 | mile, U.S. statute (mi) |
kilometer (km) | 0.54000 | mile, nautical (nmi) |
Pressure | ||
decibar (dbar) | 1.45000 | pound per square inch (lb/in2) |
millibar (mbar) | 0.02953 | inch of mercury at 32°F (inHg) |
hectopascal (hPa) | 0.0145 | pound per square inch (lb/in2) |
Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as °F = (1.8 × °C) + 32.
Horizontal coordinate information is referenced to the World Geodetic System of 1984 (WGS 84).
Pressure measured underwater is given in decibars (dbar).
Current speed is given in centimeters per second (cm/s).
Current direction is given in degrees, as direction to which the water is flowing, measured clockwise from North (degrees).
Wind speed is given in meters per second (m/s).
Wave direction is given in degrees, as coming from which waves are propagating, measured clockwise from North (degrees).
Turbidity is given in nephelometric turbidity units (NTU).
Salinity is given as practical salinity units (PSU).
Irradiance is given in watts per square meter (W/m2).
Conductivity is given in siemens per meter (S/m).
Sound is given in decibels (dB).
acoustic backscatter sensor
acoustic Doppler current profiler
acoustic Doppler velocimeter
high resolution
hertz
megahertz
meters above bottom
Network Common Data Form
Coastal inlets are unique features that affect the nearshore current and waves, resulting in changes to the along- and across-shelf movement of material. To better understand these systems and how they respond to storm events, the U.S. Geological Survey made time-series measurements of oceanographic, water-quality, sea-floor bedform movement, and meteorological parameters from fixed stations offshore of Matanzas Inlet, Florida, in winter 2018. The parameters measured include single-point and profiled water velocity (ocean currents), subsurface water pressure, turbidity, hydrographic parameters, and movement of sediment at the sea floor. Wave spectra and statistics were calculated from water velocity and subsurface pressure measurements. Buoy-mounted meteorological sensors also collected data as part of this study; parameters measured include wind speed, gust, and direction; air temperature; barometric pressure; relative humidity; and shortwave solar radiation.
Two sites are identified by mooring identification numbers and site identification names (
Table 1. Deployment and location information for platforms deployed offshore of Matanzas Inlet, Florida from January 24 to April 13, 2018
[ID, identification number; N, north; W, west; m, meter]
Mooring ID | Site ID | Platform type | Latitude (N) | Longitude (W) | Depth (m) |
1109 | Shallow | Top-hat buoy | 29.7114 | 81.2184 | 8.1 |
1110 | Shallow | Large quadpod | 29.7114 | 81.2186 | 8.6 |
1111 | Deep | 2-m foam buoy | 29.7136 | 81.2138 | 15.3 |
1112 | Deep | Large quadpod | 29.7133 | 81.2146 | 14.9 |
Study area near Matanzas Inlet, Florida. The State outline is shown at the left with the inset at right, displaying the local bathymetry and site locations “shallow” (mooring numbers 1109 and 1110) and “deep” (mooring numbers 1111 and 1112). km, kilometer; m, meter.
Figure 1. Regional map of study area near Matanzas Inlet, Florida
The instrumented sea-floor platform prior to deployment at the Matanzas Inlet, Florida, shallow site. The two Imagenex sonars, Nortek acoustic Doppler velocimeters (ADVs), Aquatec Aquascat acoustic backscatter sensor (ABSS), upward-looking acoustic Doppler current profilers (ADCPs), acoustic pingers, Sea-Bird Seagauge, and acoustic release recovery system are shown in this view. Photograph by Ellyn Montgomery, U.S. Geological Survey.
Figure 2. Photograph showing the instrumented sea-floor platform prior to deployment at the Matanzas Inlet, Florida, shallow site
Instrumented sea-floor platform being moved on deck prior to deployment at the Matanzas Inlet, Florida, deep site. Photograph by Ellyn Montgomery, U.S. Geological Survey.
Figure 3. Photograph showing instrumented sea-floor platform being moved on deck prior to deployment at the Matanzas Inlet, Florida, deep site
Surface buoy with meteorological sensors deployed at the deep site off Matanzas Inlet, Florida. Photograph by Ellyn Montgomery, U.S. Geological Survey.
Figure 4. Photograph showing surface buoy with meteorological sensors deployed at the deep site off Matanzas Inlet, Florida
To supplement the data summarized in this report, sediment samples were collected at both sites using a Shipek grab sampler and processed for grain-size information using a Horiba LA–960A laser-diffraction particle-size analyzer with a slurry sampler. Results of the laboratory analysis of the grab samples are available in
This study sought to explore inlet dynamics and expand our knowledge of how storms may affect sediment stability near an inlet. Matanzas Inlet is a natural, unmaintained inlet on the Florida Atlantic coast, south of St. Augustine. Much of the east coast of the United States is developed, so this experiment at Matanzas Inlet was a unique opportunity to study inlet dynamics at a natural setting. The dynamics of interest are the interaction of outflowing fresh water from the Matanzas River with the tides, currents, and waves encountered beyond the river mouth. Being unmaintained was an important factor in choosing this inlet for study. Inlets maintained for commercial and recreational boating are altered by anthropogenic forces, and the bathymetry of these systems may not be representative of the natural hydrodynamic processes that were measured, likely causing errors in the estimates of sediment transport. Sediment fluxes may be driven by a variety of factors, such as along-shore flow, tidal flow, and wave-induced bottom stress. The flux, as the cause of sediment accretion or erosion, influences inlet stability and migration.
The two deployment sites were slightly north of the inlet mouth (
Autonomous instruments, with internal power and memory, were deployed at the two sites from January 24 to April 13, 2018, to measure the current velocity structure outside the surf zone near the Matanzas Inlet and the effects on sediment transport in response to periodic storm events. The instruments on the bottom platforms (
The larger buoy at the deeper site supported meteorological measurement of local atmospheric conditions during the study (
The following instruments, with measured parameters, were used to collect time-series data in this study:
Nortek Aquadopp high-resolution (HR) acoustic Doppler current profiler (ADCP): current profiles
Nortek Signature acoustic Doppler current profiler (ADCP): current profiles
Nortek Vector acoustic Doppler velocimeter: single-point current measurements
TRDI–V acoustic Doppler current profiler (ADCP): current profiles, waves (directional)
Sea-Bird model SBE 26 Seagauge: waves (nondirectional)
Sea-Bird model SBE 37–SM MicroCAT: temperature and conductivity
Aquatec model Aquascat acoustic backscatter sensor: acoustic backscatter profiles
Aquatec model Aqualogger 200TY with Seapoint optical backscatter sensor: turbidity
Imagenex model 881B tilt-adjusting imaging sonar: bedform evolution
Imagenex model 881A high-frequency imaging sonar: bedform evolution
Down East weather station: meteorology (winds, barometric pressure, air temperature, relative humidity, and shortwave solar radiation)
Benthos pinger, to help locate the bottom platforms.
Table 2. Links to processed water flow (current velocity) data, by site and instrument, for platforms deployed offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file |
Shallow | ||||
---|---|---|---|---|
1110 | TRDI–V ADCP | 23881 | 2.4 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Nortek Vector | 12249/5086 | 0.6 | |
Deep | ||||
1112 | TRDI–V ADCP | 23857 | 2.4 | |
1112 | Nortek Aquadopp HR | 5374 | 1.5 | |
1112 | Nortek Vector | 11716/5096 | 0.6 | |
1112 | Nortek Vector | 12944/5243 | 0.6 |
Table 7. Link to meteorological data collected at the deep site offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (m) | Data file |
Deep | ||||
---|---|---|---|---|
1111 | Down East weather station | USGS-2 | -2.5 |
Table 4. Links to processed acoustic and optical backscatter, by site and instrument, for platforms deployed offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file |
Shallow | ||||
---|---|---|---|---|
1110 | Aquatec Aquascat ABSS | 910-131 | 1.3 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Aqualogger 200TY | 371-002/1875 | 0.74 | |
1110 | Aquatec Aqualogger 200TY | 371-025/635 | 0.4 | |
Deep | ||||
1112 | Aquatec Aquascat ABSS | 910-130 | 1.3 | |
1112 | Aquatec Aqualogger 200TY | 371-004/144 | 0.9 | |
1112 | Aquatec Aqualogger 200TY | 371-027/240 | 0.6 |
Table 5. Links to sonar data collected at the shallow site offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file |
Shallow | ||||
---|---|---|---|---|
1110 | Imagenex 881B imaging sonar | 1751 | 1.0 | |
1110 | Imagenex 881A high-frequency imaging sonar | 5908 | 0.45 |
Table 6. Links to processed seawater temperature and conductivity data, by site and instrument, for platforms deployed offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file |
Shallow | ||||
---|---|---|---|---|
1109 | Sea-Bird SBE 37 MicroCAT | 706 | 7.5 | |
1110 | Sea-Bird SBE 37 MicroCAT | 3575 | 0.75 | |
Deep | ||||
1111 | Sea-Bird SBE 37 MicroCAT | 465 | 14.2 | |
1112 | Sea-Bird SBE 37 MicroCAT | 681 | 0.75 |
Both sea-floor platforms supported several instruments that measured ocean properties at different depths as well as concurrent depths, and the sea-floor platforms were spatially separated for gradient computations. An upward-looking TRDI–V current velocity profiler was mounted on each platform at 2.4 meters above bottom (mab) (transducer height) to record the current profiles and wave statistics (height, period, and direction). The TRDI–V current velocity profilers were configured to measure the current profiles at 15-minute intervals and collect bursts of velocity and pressure data at hourly intervals for directional wave analysis. The burst data are provided in
Each platform also had a Sea-Bird SBE 26 Seagauge Wave and Tide Recorder mounted at 0.4 mab to measure pressure with Paroscientific Digiquartz sensors, which have an accuracy of 0.01 percent of the full measurement range of the sensor. The Sea-Bird SBE 26 Seagauge at the shallow site had a 30-m full scale, and the one at the deep site had a 130-m full scale. They sampled in hourly bursts of 4,096 points at 2 Hz. Nondirectional wave statistics and tidal elevations were computed from the pressure burst data.
Finally, both platforms had two additional Nortek Vector velocimeters mounted 0.5 mab and separated by 2 m horizontal distance. The shallow bottom frame was deployed such that the velocimeter probes were aligned parallel to the shoreline. Each velocimeter collected hourly bursts of 32,768 points sampled at 16 Hz.
The Nortek Aquadopp, Nortek Signature, Nortek Vectors, and Sea-Bird Seagauge instruments all operated for the complete duration of the deployment (about 2.5 months). Unfortunately, the TRDI–V at the shallow site failed to get power from its external battery, so its record ends early on February 23 (about 1 month). The TRDI–V at the deep site functioned throughout the deployment; however, it experienced intermittent power failures throughout due to a poor power connection with the external battery. This created 1- to 2-minute gaps in some of the burst data. Wave statistics were calculated from bursts that were complete. The entire raw burst datasets are released for completeness.
Both sea-floor platforms supported sensors to evaluate turbidity using acoustic and optical methods. To record acoustic backscatter profiles, downward-looking Aquatec Aquascat acoustic backscatter sensors with three transducers (0.5, 2.5, and 4.0 megahertz [MHz]) were mounted on each quadpod at 1.3 mab. Each acoustic backscatter sensor recorded hourly bursts of 2,048 samples at 2 Hz in 1-cm depth bins. Like the velocity data, these data were also averaged after recovery from 120-second subsamples, but only at the top and quarter hour since these bursts were only 1,024 seconds long.
On each bottom platform, optical backscatter was measured by two Aquatec Aqualoggers with Seapoint optical backscatter sensors mounted on one leg. These were placed at 0.74 and 0.4 mab at the shallow site and 0.9 and 0.6 mab at the deep site. Only the upper sensor on the shallow platform logged data for the entire deployment, but three others recorded data that passed quality assurance and control for almost the whole duration. Data from the lower sensor on the shallow platform end on April 5, when the head was sheared off. On the deep platform, both optical sensors became fouled during the deployment; data that passed quality assurance and control recording from the upper sensor end on April 2, and from the lower sensor they end on March 9.
The sea floor at the shallow platform was expected to be more dynamic, so both Imagenex sonars were mounted there. It had two imaging sonars with different frequencies to enable robust data collection over the widest range of conditions. The high-frequency sonar, operated at 2.25 MHz, was mounted on a leg at 0.45 mab and imaged the seabed every 30 minutes. The low-frequency sonar, operated at 1.33 MHz, was mounted between two adjacent legs at 0.96 mab and imaged the seabed every hour. Both sonars operated for the full duration of the deployment. The regions imaged by the sonars overlapped so that stereoscopic techniques could be employed to analyze ripple size, shape, and orientation.
Sea-Bird MicroCATs were attached to the underwater structure of the buoys at both sites to measure near-surface water temperature and conductivity every 5 minutes. A MicroCAT was also mounted on each quadpod at 0.75 mab to record data near the other near-sea-floor observations. All four MicroCATs recorded data throughout the deployment. The conductivity cell on the shallow platform clogged during a storm on February 11, after which no salinity data are available.
At the deep site a buoy-mounted weather station made by Down East provided local meteorological conditions during the study period. The sensors were mounted 2.5 meters above the sea surface, and they measured air temperature, barometric pressure, wind speed and direction, relative humidity, and shortwave radiation throughout the deployment.
The optical and acoustic sensor transducers and the sonar heads were covered with zinc oxide paste just prior to deployment to discourage the settling and growth of organisms.
All the deployed instruments were autonomous, with internal data storage. After recovery, data were offloaded from the instruments. Manufacturers’ software was used to apply calibration coefficients and convert the data to scientific units. These output files were then converted by custom, instrument-specific MATLAB programs to Equatorial Pacific Information Collection (EPIC) convention-compliant Network Common Data Form (netCDF) files for release and distribution on the U.S. Geological Survey Oceanographic Time-Series Data Collection website. Files listed in this report are available in
All subsurface pressure data (data from the TRDI–V ADCPs, Nortek Signature, Nortek Vector, Nortek Aquadopp, and Sea-Bird Seagauge instruments) were corrected for changes in atmospheric pressure by using local barometric pressure data from the meteorological station at the deep site (mooring number 1111). This was done to give a more accurate representation of pressure caused by the overlying water. Corrected pressure records were saved in the netCDF files with the variable name “P_1ac.”
The TRDI–V current velocity profiler wave data were processed with the manufacturer’s software to output spectra (pressure, surface, velocity) and these statistics (variable names are in parentheses):
significant wave height (wh_4061)
mean wave height (mwh_4064)
peak period (wp_peak)
mean period (wp_4060)
direction of the peak wave period (wvdir)
Quality control and quality assurance checks were performed on all the data collected. Measurements that did not pass the quality control and quality assurance process were replaced with fill values in the netCDF output file. Fill values indicate nonvalid data points and are assigned a value of 1e35 for floating point variables and −32,768 for integer variables. Obvious spikes in individual parameter time series were removed by using either a recursive filter or median filter technique, in which values that changed from one time point to the next by more than a set threshold were flagged and assigned a fill value. Velocity data from the current velocity profilers and velocimeters were checked for low correlation values, which were replaced by fill values. For upward-looking current velocity profiles, velocity bins that were too close to or above the water surface were likewise assigned fill values.
Time-series data quantifying currents, waves, acoustic and optical backscatter, sonar images, and meteorological conditions were collected to estimate how sediment dynamics near a natural inlet respond to periodic storms. The overall data return for the experiment exceeded 80 percent. The most common cause of data loss was instrument or sensor failures, most notably the TRDI–V at the shallow site. The other significant cause of data loss was fouling of the conductivity and temperature sensors on the MicroCATs and backscatter sensors. There was heavy barnacle and encrusting biofouling on the aluminum quadpods and the instrument housings, but the zinc oxide paste effectively prevented the encrusting organisms from attaching to the transducers (
Biofouling on the quadpod shown compared to minimal fouling on sensors coated with zinc oxide paste (white). Photograph by Dann Blackwood, U.S. Geological Survey.
Figure 5. Photograph showing biofouling on the quadpod compared to minimal fouling on sensors coated with zinc oxide paste (white)
Note that the platform at the shallow site rotated from its original deployment position several times during storms. The heading, pitch, and roll data from the sensors indicate the platform rotated on February 1, 3, and 13, about 5 degrees west each time, and on March 5, the platform rotated 20 degrees west (west rotation is negative or counterclockwise). This movement is accounted for in the treatment of currents and waves data and is not accounted for in the sonar image data, since the sonar data are distributed without any transformations.
The landing page for these data (
The TRDI–V current velocity profiler on the shallow platform only collected a month of data, but the other TRDI–V at the deep site worked for the full 2.5 months, providing one full record of upward-looking current profiles (
Current data from the acoustic Doppler current profilers (ADCPs) from both platforms, showing near-surface and near-sea-floor observations, along with significant wave height in the top frame, Matanzas Inlet, Florida (
Figure 6. Graphs showing current data from the acoustic Doppler current profilers from both platforms, showing near-surface and near-sea-floor observations, along with significant wave height in the top frame, Matanzas Inlet, Florida
Profiles of east and north components of velocity from the downward-looking acoustic Doppler current profilers above the sea floor, Matanzas Inlet, Florida (
Figure 7. Profiles of east and north components of velocity from the downward-looking acoustic Doppler current profilers above the sea floor, Matanzas Inlet, Florida
Spectra and statistics for directional waves from the TRDI–V and nondirectional waves from Seagauge pressure loggers were calculated (
Table 3. Links to processed wave (directional and nondirectional) data, by site and instrument, for platforms deployed offshore of Matanzas Inlet, Florida, from January 24 to April 13, 2018
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file | Direction |
Shallow | |||||
---|---|---|---|---|---|
1110 | TRDI–V ADCP | 23881 | 2.4 | Y | |
1110 | Sea-Bird SBE 26 Seagauge | 1378 | 0.4 | N | |
Deep | |||||
1112 | TRDI–V ADCP | 23857 | 2.4 | Y | |
1112 | Sea-Bird SBE 26 Seagauge | 1099 | 0.4 | N |
Wave statistics from upward-looking acoustic Doppler current profilers (ADCPs, directional) and Sea-Bird Seagauge (nondirectional) pressure loggers at both sites, Matanzas Inlet, Florida (
Figure 8. Graphs showing wave statistics from upward-looking acoustic Doppler current profilers (directional) and Sea-Bird Seagauge (nondirectional) pressure loggers at both sites, Matanzas Inlet, Florida
Acoustic backscatter profiles of the water within 1 meter above the sea floor were made by three separate transducers with different frequencies: 0.5, 2.5, and 4.0 MHz on the Aquatec Aquascat acoustic backscatter sensors and 1 MHz on the Nortek Signature acoustic Doppler current profiler. Each frequency responds to a different range of sediment grain sizes, and the frequencies are used in tandem to understand the drivers of sediment resuspension. The data from the 2.5-MHz transducer (
Profiles of acoustic backscatter at 2.5 megahertz (MHz) for both sites, Matanzas Inlet, Florida are compared with significant wave height from upward-looking acoustic Doppler current profilers (ADCPs, directional) and Sea-Bird Seagauge (nondirectional) pressure loggers at both sites, Matanzas Inlet, Florida (
Figure 9. Profiles of acoustic backscatter at 2.5 megahertz for both sites, Matanzas Inlet, Florida are compared with significant wave height from upward-looking acoustic Doppler current profilers (directional) and Sea-Bird Seagauge (nondirectional) pressure loggers at both sites, Matanzas Inlet, Florida
Optical backscatter results showed variation in turbidity with height above sea floor and in response to storms (
Near-sea-floor turbidity observations collected at both sites, Matanzas Inlet, Florida. The files from which the data were plotted are in parentheses (
Figure 10. Graphs showing near-sea-floor turbidity observations collected at both sites, Matanzas Inlet, Florida
Both Imagenex sonars were mounted on the shallow platform underwater and were oriented to have large regions of overlap. After processing, each sonar sample describes a circle with grayscale variations indicating ripple presence and their directions. Prior to deployment, the bottom-platform sonar images were overlaid to determine the leg positions in each image, allowing them to be aligned. The sonars were programmed to leave a thin slice of the circle empty for additional quality assurance and control. The positions of the empty zones relative to each other and the known orientations of the sonars are additional confirmation that the images are correctly rotated so that north is up (
Example bottom image from the high-frequency (HF) sonar data showing distinct ripples on the seabed, Matanzas Inlet, Florida (
Figure 11. Example bottom image from the high-frequency sonar data showing distinct ripples on the seabed, Matanzas Inlet, Florida
Sea-Bird SBE 37–SM MicroCAT instruments, measuring conductivity and temperature, were deployed at both sites to record surface and near-sea-floor conditions. All four collected data successfully throughout the deployment (
Temperature and conductivity measured by the MicroCATs near the surface and near the sea floor at shallow and deep sites, Matanzas Inlet, Florida (
Figure 12. Graphs showing temperature and conductivity measured by the MicroCATs near the surface and near the sea floor at shallow and deep sites, Matanzas Inlet, Florida
Local meteorological conditions were recorded to provide accurate corrections to the underwater pressure measurements (
Air temperature, relative humidity, and shortwave radiation from the deep site, Matanzas Inlet, Florida (
Figure 13. Graphs showing air temperature, relative humidity, and shortwave radiation from the deep site, Matanzas Inlet, Florida
Barometric pressure, wind speed, wind gust, and wind direction from the deep site, Matanzas Inlet, Florida (
Figure 14. Graphs showing barometric pressure, wind speed, wind gust, and wind direction from the deep site, Matanzas Inlet, Florida
[Data files are in
Mooring ID | Instrument | Serial no. | Sensor elevation (mab) | Data file |
Shallow | ||||
---|---|---|---|---|
1110 | TRDI–V ADCP | 23881 | 2.4 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Nortek Signature | 100593 | 1.5 | |
1110 | Aquatec Aquascat ABSS | 910-131 | 1.3 | |
1110 | Nortek Vector | 12249/5086 | 0.6 | |
1110 | Sea-Bird SBE 26 Seagauge | 1378 | 0.4 | |
Deep | ||||
1112 | TRDI–V ADCP | 23857 | 2.4 | |
1112 | Nortek Aquadopp HR | 5374 | 1.5 | |
1112 | Aquatec Aquascat ABSS | 910-130 | 1.3 | |
1112 | Nortek Vector | 11716/5096 | 0.6 | |
1112 | Nortek Vector | 11716 | 2.0 | |
1112 | Nortek Vector | 12944/5243 | 0.6 | |
1112 | Sea-Bird SBE 26 Seagauge | 1099 | 0.4 |
For more information about this report, contact:
Director, Woods Hole Coastal and Marine Science Center
U.S. Geological Survey
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