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https://hdl.handle.net/11681/41863| Title: | Geophysical investigation to assess condition of grouted scour hole : Old River Control Complex—Low Sill Concordia Parish, Louisiana |
| Authors: | Simms, Janet E. Breland, Benjamin R. Doll, William E. |
| Keywords: | Geophysics Electrical resistivity Mississippi River Seismic refraction Old River Control Complex Low Sill Concordia Parish (La.) Diversion structures (Hydraulic engineering) Grouting (Soil stabilization) Geophysical surveys |
| Publisher: | Geotechnical and Structures Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/GSL TR-21-30 |
| Abstract: | Geophysical surveys, both land-based and water-borne, were conducted at the Old River Control Complex‒Low Sill, Concordia Parish, LA. The purpose of the surveys was to assess the condition of the grout within the scour region resulting from the 1973 flood event, including identification of potential voids within the grout. Information from the ground studies will also be used for calibration of subsequent marine geophysical data and used in stability analysis studies. The water-borne survey consisted of towed low frequency (16-80 MHz) ground penetrating radar (GPR), whereas the land-based surveys used electrical resistivity and seismic refraction. The GPR survey was conducted in the Old River Channel on the upstream side of the Low Sill structure. The high electrical conductivity of the water (~50 mS/m) precluded penetration of the GPR signal; thus, no useful data were obtained. The land-based surveys were performed on both northeast and southeast sides of the Low Sill structure. Both resistivity and seismic surveys identify a layered subsurface stratigraphy that corresponds, in general, with available borehole data and constructed geologic profiles. In addition, an anomalous area on the southeast side was identified that warrants future investigation and monitoring. |
| Description: | Technical Report |
| Gov't Doc #: | ERDC/GSL TR-21-30 |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/41863 http://dx.doi.org/10.21079/11681/41863 |
| Appears in Collections: | Technical Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ERDC-GSL TR-21-30.pdf | 7.24 MB | Adobe PDF |  View/Open |