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Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/30369
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dc.contributor.authorRamirez, Michael T.-
dc.contributor.authorSmith, S. Jarrell-
dc.contributor.authorLewis, James W.-
dc.contributor.authorPratt, Thad C.-
dc.date.accessioned2018-11-20T19:35:01Z-
dc.date.available2018-11-20T19:35:01Z-
dc.date.issued2018-10-
dc.identifier.govdocMRG&P Report No. 22-
dc.identifier.urihttp://hdl.handle.net/11681/30369-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/30369-
dc.descriptionMRG&P Report-
dc.description.abstractBedforms are a consequence of flow of sufficient magnitude over a mobile sediment bed. They are a primary component of the drag acting upon a moving stream, yet are infrequently explicitly treated in numerical models of fluvial sediment transport. This study aims to document the collection of bathymetric data in the Mississippi River in an area of persistent and dynamic bedforms over a range of flow conditions, statistically examine bedform geometry, and parameterize results for inclusion in numerical models. Bathymetric data were collected several times to measure rates of bedform transport. Linear profiles of the bedforms were extracted from the bathymetry and analyzed for roughness and dune population statistics. These statistics are compared with the flow conditions under which the bedforms were observed. Bedforms increase in size with discharge and decrease in steepness (height:length ratio). At extremely high discharges, bedforms begin to decrease in size. In comparing results with methods for calculating form drag coefficients, it was observed that the dunes at higher river stages, despite their greater size, may present less resistance to flow due to their reduced steepness and reduced relative heights (dune height:flow depth).en_US
dc.description.sponsorshipMississippi River Geomorphology and Potamology Program (U.S.)en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers. Mississippi Valley Division.-
dc.description.tableofcontentsAbstract .......................................................................................................................................................... ii Figures and Tables ........................................................................................................................................ iv Preface ............................................................................................................................................................ vi Unit Conversion Factors .............................................................................................................................vii 1 Introduction ............................................................................................................................................ 1 Background .............................................................................................................................. 1 Objective ................................................................................................................................... 1 Approach ................................................................................................................................... 2 2 Methods .................................................................................................................................................. 3 Field data collection ................................................................................................................. 3 Roughness analysis ................................................................................................................. 4 Flow characteristics.................................................................................................................. 7 3 Results .................................................................................................................................................... 9 Bathymetry................................................................................................................................ 9 Roughness ................................................................................................................................ 9 Streamflow .............................................................................................................................. 14 River stage and slope records ................................................................................................... 14 Rating curve ............................................................................................................................... 17 4 Discussion ............................................................................................................................................ 20 Friction factors ........................................................................................................................ 20 5 Conclusion and Recommendations ................................................................................................ 24 References ................................................................................................................................................... 25 Appendix A: Bathymetry ............................................................................................................................ 27 Appendix B: Bedform Profiles .................................................................................................................. 40 Appendix C: Bedform Roughness Statistics ....................................................................................... 333 Report Documentation Page-
dc.format.extent357 pages / 53.61 Mb-
dc.format.mediumPDF/A-
dc.language.isoen_USen_US
dc.publisherUnited States. Army. Corps of Engineers. Mississippi Valley Division.en_US
dc.publisherUnited States. Mississippi River Commission.en_US
dc.publisherCoastal and Hydraulics Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)en_US
dc.relation.ispartofseriesTechnical Report (Mississippi River Geomorphology and Potamology Program (U.S.)) ; no. MRG&P Report No. 22-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectMississippi Riveren_US
dc.subjectRiver channels--Measurementen_US
dc.subjectSedimentation and depositionen_US
dc.subjectSediment transporten_US
dc.subjectStream measurementsen_US
dc.subjectVicksburg (Miss.)en_US
dc.titleMississippi river bedform roughness and streamflow conditions near Vicksburg, Mississippi : data collection summary and analysisen_US
dc.typeReporten_US
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