USGS Coastal and Marine Hazards and Resources Program
South Carolina Coastal Erosion Study, Data Report for Observations, October 2003 - April 2004
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Salinity and temperature observations: Seawater temperature (degrees C), conductivity (S/m), salinity (psu) and sigma-theta (kg/m³) are shown at sites 2, 3, 6, and 7A. At Site 2 and Site 3 observations were at the surface and the bottom. Observations at Site 6 were at the bottom, while at Site 7 observations were at the surface. A combined plot of all observations is also provided. Conductivity-temperature sensors were not deployed at sites 1, 4, 5, 7B and 8. An absence of observations is indicated by n/o. Significant wave height from site 2 is also included to provide an indication of wave energy. Data from all sites show an offset near January 20 when the instruments were removed, cleaned, and re-deployed. This type of offset typically indicates biofouling during the first deployment. The drift was not removed from the data provided in this report.
| Site 2 | surface | bottom |
| Site 3 | surface | bottom |
| Site 6 | n/o | bottom |
| Site 7A | surface | n/o |
| All Observations |
Unfiltered water flow observations: Unfiltered water flow observations (cm/s) at individual sites are shown at the surface, at 4 mbs, at 6 mbs, and at the bottom. Observations are from RD Instruments' Workhorse ADCPs, except at sites 6 and 8, where observations are from a SonTek Argonaut ADP and a Nortek Aquadopp AP, respectively. At all sites, the surface is the upper most bin at which data has not been greatly affected by waves or tides. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy.
| Sites | Current speed and direction at the surface, 4 mbs, 6 mbs and the bottom | East and north velocity at the surface and 4 mbs | East and north velocity at 6 mbs and the bottom | Cross- and longshore velocity at the surface and 4 mbs | Cross- and longshore velocity at 6 mbs and the bottom |
|---|---|---|---|---|---|
| Site 1 | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| Site 2 | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| Site 3 | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| Site 4 | spdir_s46b | en_s4 | en_6b | en_6b | xl_6b |
| Site 5 | no usable data | no usable data | no usable data | no usable data | no usable data |
| Site 6 | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| Site 7B | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| Site 8 | spdir_s46b | en_s4 | en_6b | xl_s4 | xl_6b |
| All Obs. | No plot | en_s4_all | s4_en_6b_all | xl_s4_all | xl_6b_all |
Low-pass filtered water flow observations: Low-passed water flow observations (cm/s) at individual sites are shown at the surface, at 4 mbs, at 6 mbs, and at the bottom. Observations are from RD Instruments' Workhorse ADCPs, except at sites 6 and 8, where observations are from a SonTek Argonaut ADP and a Nortek Aquadopp AP, respectively. At all sites, the surface is defined as the upper most bin at which data has not been greatly affected by waves or tides. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy.
| Sites | Low-passedcurrent speed and direction at the surface, 4 mbs, 6 mbs and the bottom | Low-passed east and north velocity at the surface and 4 mbs | Low-passed east and north velocity at 6 mbs and the bottom | Low-passed cross- and longshore velocity at the surface and 4 mbs | Low-passed cross- and longshore velocity at 6 mbs and the bottom |
|---|---|---|---|---|---|
| Site 1 | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| Site 2 | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| Site 3 | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| Site 4 | spdir_s46b_lp | en_s4_lp | en_6b_lp | en_s4_lp | xl_6b_lp |
| Site 5 | no usable data | no usable data | no usable data | no usable data | no usable data |
| Site 6 | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| Site 7B | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| Site 8 | spdir_s46b_lp | en_s4_lp | en_6b_lp | xl_s4_lp | xl_6b_lp |
| All Obs. | No plot | en_s4_all _lp | en_6b all_lp | xl_s4_all_lp | xl_6b_all_lp |
Unfiltered pressure observations: Unfiltered pressure observations are shown at individual sites. Pressure (Pa) measured by an ADCP, an Argonaut, or an Aquadopp is shown in panel 2. Pressure (dbar) measured by an external pressure sensor is shown in panel 3. Pressure (mbar) measured by an external pressure sensor that was attached to an ADV or PCADP is shown in panel 4. Significant wave height (m) from Site 2 is shown in panel 1 to provide an indication of wave energy. A combined plot of pressure observations at all sites is also provided.
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Site 1
Site 2 Site 3 Site 4 Site 5 (data unusable) Site 6 Site 7A Site 7B Site 8 All Observations |
Low-pass filtered pressure observations: Low-passed pressure observations are shown at individual sites. Pressure (Pa) measured by an ADCP, an Argonaut, or an Aquadopp is shown in panel 2. Pressure (dbar) measured by an external pressure sensor is shown in panel 3. Pressure (mbar) measured by an external pressure sensor that was attached to an ADV or PCADP is shown in panel 4. Significant wave height (m) from Site 2 is shown in panel 1 to provide an indication of wave energy. A combined plot of pressure observations at all sites is also provided.
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Site 1
Site 2 Site 3 Site 4 Site 5 (data unusable) Site 6 Site 7A Site 7B Site 8 All Observations |
Unfiltered surface wave observations: Unfiltered significant wave height (m), peak wave period (s), peak wave direction (deg. true North towards), mean-removed water depth (m), and the velocity-derived non-directional wave height spectrum (m/sqrt(Hz)) at are shown at individual sites. A combined plot of surface wave observations at all sites is also provided.
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Site 1
Site 2 Site 3 Site 4 Site 5 (data unusable) Site 6 Site 7B Site 8 All Observations |
Unfiltered Acoustic Doppler Velocimeter (ADV) observations: Unfiltered distance of measurement location the sea floor (m), water flow (cm/s) and the standard deviation of water flow (cm/s) near the sea floor is shown at Site 6 and Site 7A. All observations are from Sontek ADVs. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy. A combined plot of observations at both Site 6 and Site 7 is also provided.
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Site 6
Site 7A All Observations |
Low-pass filtered Acoustic Doppler Velocimeter (ADV) observations: Low-passed distance from the sea floor (m), water flow (cm/s) and the standard deviation of water flow (cm/s) near the sea floor is shown at Site 6 and Site 7A. All observations are from Sontek ADVs. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy. A combined plot of observations at both 6 and Site 7 is also provided.
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Site 6
Site 7A All Observations |
Unfiltered Pulse-Coherent Acoustic Doppler Profiler (PCADP): Unfiltered distance from the sea floor (m), water flow (cm/s) and the standard deviation of water flow (cm/s) near the sea floor is shown at Site 7A. All observations are from Sontek PCADPs. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy.
| Site 7A |
Low-pass filtered Pulse-Coherent Acoustic Doppler Profiler (PCADP): Low-passed distance from the sea floor (m), water flow (cm/s) and the standard deviation of water flow (cm/s) near the sea floor is shown at Site 7A. All observations are from Sontek PCADPs. Significant wave height (m) from Site 2 is also shown to provide an indication of wave energy.
| Site 7A |
Unfiltered Acoustic Backscatter Sensor (ABS) observations: Burst-mean statistics calculated from ABS data at Site 6, Site 7A, and Site 7B. Statistics include the burst-mean, standard deviation, and percentiles for the ABS' three transducers. Squares of these statistics were also calculated. Both pdf and png versions are provided. Please note that due to the complexity of these figures, the pdf version may load slowly.
| Site | all transducers | transducer 1 | transducer 2 | transducer 3 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| mean | mean squared | standard deviation | standard deviation squared | percentiles | percentiles squared | percentiles | percentiles squared | percentiles | percentiles squared | |
| Site 6 |
png | png | png | png | png | png | png | png | png | png |
| Site 7A | png | png | png | png | png | png | png | png | png | png |
| Site 7B | png | png | png | png | png | png | png | png | png | png |
Unfiltered Optical Backscatter Sensor (OBS) observations: Burst-mean voltage from OBS data at Site 6 and Site 7A.
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Site 6
Site 7A |
Animation of Sonar Data: The changing condition of the sediment bed at site 7B can be viewed as animation using media player that supports .avi files. In the top panel of the animation, backscatter intensity of the sediment bed is shown in the grayscale image, with ADV current speed noted in red. ADV current speed and direction are also indicated by the magnitude and orientation, respectively, of the red arrow. An estimate of sea floor ripple wavelenth and the direction towards which are propagating are noted in cyan. The orientation of the cyan arrow indicates the wave direction, whereas the magnitude of the cyan arrow indicates the estimate of sea floor ripple wavelength. This magnitude has been multiplied by 5 for visual purposes. The bottom panel shows significant wave height at site 7B. The red dot in this panel coincides with the time provided in the image in the top panel. At site 6 the sonar was tilted upward and (or) flooded so no sea floor images were recovered.
| Site 7B | fall deployment | spring deployment |
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