1. ERDC Knowledge Core
  2. Engineer Research and Development Center (ERDC)
  3. Geotechnical and Structures Laboratory (GSL) - (2/23/2001 - present)
  4. Publication
  5. Technical Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/44183
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dc.contributor.authorBreland, Benjamin R.-
dc.contributor.authorSimms, Janet E.-
dc.contributor.authorDoll, William E.-
dc.contributor.authorGreenwood, Jason.-
dc.contributor.authorKaufman, Ronald.-
dc.creatorGeotechnical and Structures Laboratory (U.S.)-
dc.date.accessioned2022-05-05T15:20:30Z-
dc.date.available2022-05-05T15:20:30Z-
dc.date.issued2022-04-
dc.identifier.govdocERDC/GSL TR-22-9-
dc.identifier.urihttps://hdl.handle.net/11681/44183-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/44183-
dc.descriptionTechnical Reporten_US
dc.description.abstractThe Old River Low Sill Structure (ORLSS) at the Old River Control Complex (ORCC) in Concordia Parish, LA, is a steel pile-founded, gated reinforced-concrete structure that regulates the flow of water into the Atchafalaya River to prevent an avulsion between the Mississippi River and the Atchafalaya River. A scour hole that formed on the southeast wall of ORLSS during the Mississippi River flood of 1973 was remediated with riprap placement and varied mixtures of self-leveling, highly pumpable grout. Non-invasive waterborne geophysical surveys were used to evaluate the distribution and condition of the grout within the remediated scour area. Highly conductive areas were identified from the surveys that were interpreted to consist mostly of grout. Resistive responses, likely representing mostly riprap and/or sediment, were encountered near the remediated scour area periphery. A complex mixture of materials in the remediated scour area is interpreted by the more gradual transitions in the geophysical response. Survey measurements immediately beneath ORLSS were impeded by the abundance of steel along with the structure itself. The survey results and interpretation provide a better understanding of the subsurface properties of ORLSS.en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers. New Orleans District.en_US
dc.description.tableofcontentsAbstract .................................................................................................................................... ii Figures and Tables ................................................................................................................... v Preface ................................................................................................................................... viii Executive Summary ............................................................................................................... ix 1 Introduction ...................................................................................................................... 1 1.1 Purpose .............................................................................................................. 1 1.2 Scope .................................................................................................................. 1 1.3 Background ........................................................................................................ 1 1.3.1 Geologic setting ........................................................................................................... 2 1.3.2 Old River Low Sill Structure (ORLSS) ......................................................................... 4 1.3.3 Physical site properties ............................................................................................... 8 1.3.4 Previous geophysical surveys ..................................................................................... 9 2 Geophysical Methods .................................................................................................... 12 2.1 Electrical resistivity tomography (ERT) .......................................................... 12 2.2 Seismic refraction and reflection ................................................................... 14 3 Field Operations ............................................................................................................. 16 3.1 Weather conditions ......................................................................................... 16 3.2 River elevation and bathymetry ...................................................................... 17 4 Data Acquisition and Processing ................................................................................. 20 4.1 Electrical resistivity data acquisition and processing................................... 20 4.2 Seismic data acquisition and processing ...................................................... 21 5 Results and Observations ............................................................................................. 27 5.1 Resistivity ......................................................................................................... 27 5.2 Inflow parallel lines ......................................................................................... 29 5.3 Inflow fan lines ................................................................................................. 31 5.4 Outflow dataset ............................................................................................... 34 5.5 Seismic ............................................................................................................ 35 5.5.1 Seismic refraction ..................................................................................................... 35 5.5.2 Seismic reflection ...................................................................................................... 37 6 Discussion ....................................................................................................................... 42 6.1 Interpretation of ERT survey .......................................................................... 43 6.1.1 General statements .................................................................................................. 43 6.1.2 Sub-bottom sediments .............................................................................................. 45 6.1.3 Left abutment riprap wingwall ................................................................................. 46 6.1.4 Resistivity trends associated with rock pile ............................................................. 47 6.1.5 Resistivity trends associated with the estimated scour area ................................. 47 6.1.6 Outflow channel and stilling basin ........................................................................... 50 6.2 Interpretation of seismic survey ..................................................................... 51 7 Conclusions .................................................................................................................... 52 References ............................................................................................................................. 57 Appendix A: Inverted Resistivity Sections ......................................................................... 59 Appendix B: Seismic Data Processing ............................................................................... 66 Unit Conversion Factors ....................................................................................................... 81 Report Documentation Page-
dc.format.extent96 pages / 19.55 MB-
dc.format.mediumPDF-
dc.language.isoen_USen_US
dc.publisherEngineer Research and Development Center (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/GSL TR-22-9-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectWaterborneen_US
dc.subjectSubsurfaceen_US
dc.subjectGeophysicsen_US
dc.subjectGeophysical surveysen_US
dc.subjectElectrical resistivity tomographyen_US
dc.subjectSeismic refractionen_US
dc.subjectInfrastructureen_US
dc.subjectMississippi Riveren_US
dc.subjectScour (Hydraulic engineering)en_US
dc.subjectGrout conditionen_US
dc.subjectGrouting (Soil stabilization)en_US
dc.subjectDiversion structures (Hydraulic engineering)en_US
dc.subjectConcordia Parish (La.)en_US
dc.titleWaterborne geophysical investigation to assess condition of grouted foundation : Old River Control Complex – Low Sill Structure, Concordia Parish, Louisianaen_US
dc.typeReporten_US
Appears in Collections:Technical Report

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