Near-bed velocity measurements in Monterey Bay during arrival of the 2010 Chile Tsunami
On February 27, 2010, a tsunami originating near Chile arrived in Monterey Bay, California. This data release comprises two hours of pressure and near-bed velocity data spanning the largest tsunami waves. At the time, the U.S. Geological Survey Pacific Coastal and Marine Science Center had a remotely-controlled instrumented platform deployed adjacent to the Santa Cruz Municipal Wharf (mean depth 9 m) for collecting hydrodynamic and sediment transport data. In anticipation of the arrival of the tsunami, sampling was changed to better capture the event. Pressure and near-bed velocity profiles were measured at 1 Hz for 25 minutes every half hour. The velocities are influenced by surface waves, tsunami waves, and tidal currents. The velocity profiles capture the unsteady boundary layer that developed due to the tsunami-induced currents. They are useful for understanding the frictional interaction of the tsunami with the sea floor, as well as sediment transport produced by the tsunami.
Additional information about the field activities from which these data were derived is available online at:
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Ferreira, Joanne C.T., Lacy, Jessica R., and Hatcher, Gerald, 20201231, Near-bed velocity measurements in Monterey Bay during arrival of the 2010 Chile Tsunami: data release doi:10.5066/P9T90PO1, U.S. Geological Survey, Pacific Coastal and Marine Science Center Santa Cruz, California.
Data were collected continuously at survey locations. Refer to self-contained NetCDF files for more location information.
What coordinate system is used to represent geographic features?
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude.
Latitudes are given to the nearest 1.0E-5.
Longitudes are given to the nearest 1.0E-5.
Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is World Geodetic System 1984 (WGS84).
The ellipsoid used is WGS84.
The semi-major axis of the ellipsoid used is 6378137.0.
The flattening of the ellipsoid used is 1/298.257223563.
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The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.
These data were collected to measure conditions near the sea floor on the inner shelf during the arrival of a remote tsunami in Monterey Bay. Purposes for the data collection included determining sediment transport generated by the tsunami, and for producing a data set to test numerical models of tsunami flows and their interaction with the sea floor. These data are intended for science researchers, students, policy makers, and the general public.
Programming of Sontek pulse coherent acoustic doppler profiler (PCADP) deployed in Monterey Bay changed to capture tsunami data.
Date: 15-Mar-2010 (process 2 of 5)
PCADP data processed using manufacturers software.
Date: 26-Oct-2010 (process 3 of 5)
Data from pulse-coherent velocimeters must be corrected for ambiguity errors, which occur when velocities exceed the resolved range (Lacy and Sherwood, 2004). To assist with this correction, the Sontek PCADP measures velocities (called resolution velocities) at a single point at relatively short range, where greater velocities can be resolved, before collecting each profile. For these four bursts, we first corrected ambiguity errors in the resolution velocities, attributable to the high instantaneous speeds produced by the combination of surface waves and the tsunami. Then ambiguity errors in the velocity profiles were resolved as described in Lacy and Sherwood (2004), using the corrected rather than raw resolution velocities.
Date: 23-Nov-2020 (process 4 of 5)
Data were accumulated into a NetCDF file and bad sensor data removed.
Date: 13-Oct-2021 (process 5 of 5)
Performed minor edits to the metadata to correct typos. No data were changed
Person who carried out this activity:
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