Continuous resistivity profiling (CRP) in the Cedar River Floodplain, Cedar Rapids, Iowa, 2015
In April 2015, approximately 19 miles of continuous resistivity profiling (CRP) surveys were collected on the Cedar River in Cedar Rapids, Iowa. The CRP method was used to characterize the resistivity of the water column and subbottom materials. Five CRP profiles were collected concurrently with the continuous seismic methods. For this investigation, 11 electrodes spaced 10 m apart and mounted in a streamer were towed behind the boat and data were collected using the dipole-dipole array type. The first two electrodes, closest to the boat, were used to inject current into the water and subbottom materials, and eight electrical potential measurements were made using the remaining nine electrodes. With this system, a complete suite of measurements is collected every 2.8 seconds. Because the boat is moving at a slow rate of speed, a complete measurement is taken while the boat has moved about 3-5 m. In general, voltage measurements taken with larger electrode spacings extend deeper into the subsurface. The exact depth and resistivity are determined through a process of inversion. The raw CRP data are shared in this data release.
Complete Metadata
| accessLevel | public |
|---|---|
| bureauCode |
[
"010:12"
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|
| contactPoint |
{
"fn": "Emilia L Bristow",
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"hasEmail": "mailto:ebristow@usgs.gov"
}
|
| description | In April 2015, approximately 19 miles of continuous resistivity profiling (CRP) surveys were collected on the Cedar River in Cedar Rapids, Iowa. The CRP method was used to characterize the resistivity of the water column and subbottom materials. Five CRP profiles were collected concurrently with the continuous seismic methods. For this investigation, 11 electrodes spaced 10 m apart and mounted in a streamer were towed behind the boat and data were collected using the dipole-dipole array type. The first two electrodes, closest to the boat, were used to inject current into the water and subbottom materials, and eight electrical potential measurements were made using the remaining nine electrodes. With this system, a complete suite of measurements is collected every 2.8 seconds. Because the boat is moving at a slow rate of speed, a complete measurement is taken while the boat has moved about 3-5 m. In general, voltage measurements taken with larger electrode spacings extend deeper into the subsurface. The exact depth and resistivity are determined through a process of inversion. The raw CRP data are shared in this data release. |
| distribution |
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| identifier | http://datainventory.doi.gov/id/dataset/USGS_5d0295d0e4b05cc71caf1146 |
| keyword |
[
"Cedar Rapids",
"Cedar River",
"Iowa",
"USGS:5d0295d0e4b05cc71caf1146",
"aquifer",
"continuous resistivity profiling",
"electrical resistivity imaging",
"environment",
"geophysics",
"geoscientificInformation",
"measurement",
"seismic methods"
]
|
| modified | 2020-08-13T00:00:00Z |
| publisher |
{
"name": "U.S. Geological Survey",
"@type": "org:Organization"
}
|
| spatial | -91.80633, 41.97710, -91.64703, 42.06918 |
| theme |
[
"Geospatial"
]
|
| title | Continuous resistivity profiling (CRP) in the Cedar River Floodplain, Cedar Rapids, Iowa, 2015 |
