1. ERDC Knowledge Core
  2. Engineer Research and Development Center (ERDC)
  3. Coastal and Hydraulics Laboratory (CHL) - (before 9/1981 - present)
  4. Publication
  5. Technical Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/37495
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dc.contributor.authorPerkey, David W.en_US
dc.contributor.authorSmith, S. Jarrellen_US
dc.contributor.authorPriestas, Anthony M.en_US
dc.creatorCoastal and Hydraulics Laboratory (U.S.)en_US
dc.creatorDredging Operations and Environmental Research Program (U.S.)en_US
dc.date.accessioned2020-07-21T17:31:11Zen_US
dc.date.available2020-07-21T17:31:11Zen_US
dc.date.issued2020-07en_US
dc.identifier.govdocERDC/CHL TR-20-13en_US
dc.identifier.urihttps://hdl.handle.net/11681/37495en_US
dc.identifier.urihttp://dx.doi.org/10.21079/11681/37495en_US
dc.descriptionTechnical Reporten_US
dc.description.abstractDifferences in erosion behavior of non-cohesive and cohesive sediments are widely recognized. In many natural environments, sand and mud are not completely separated and occur as mixtures. Significantly less research has been conducted on the erosion behavior of sand-mud mixtures compared to the separate treatment of sand and mud erosion. Sedflume erosion experiments were conducted on sand-mud mixtures with varying mud content to define the relationships between mud content, critical stress for erosion (τc), and erosion rate. Sand-mud mixtures were prepared with three mud sources: (1) non-swelling clay (kaolinite), (2) swelling clay (kaolinite/bentonite), and (3) a swelling, natural mud from the Mississippi River. Test results showed that critical shear stresses of the mixed sediments departed from that of pure sand with mud fractions on the order of 2% to 10%. Peak τc was observed between 30% to 40% mud content, with swelling muds achieving a ten-fold increase in τc while a five-fold increase in τc was measured for kaolinite. Additionally, this study demonstrated that the introduction of small amounts (≤5%) of mud to sand reduced erosion rates by a factor of 10 to 100. This observed abatement of erosion rate has implications for the use of dredged materials in civil and environmental engineering projects.en_US
dc.description.sponsorshipPrepared for Dredging Operations and Environmental Research Program Vicksburg, MS 39180 under Project No. 485304, “Cost Effective Stabilization of Dredged Sediment for Capping and Nearshore Placement”en_US
dc.description.tableofcontentsAbstract .................................................................................................................................... ii Figures and Tables .................................................................................................................. iv Preface ..................................................................................................................................... x 1 Introduction ...................................................................................................................... 1 1.1 Background ........................................................................................................ 1 1.2 Objective(s) ........................................................................................................ 1 1.3 Approach ............................................................................................................ 2 2 Methods ............................................................................................................................ 3 2.1 Sediment properties .......................................................................................... 3 2.2 Erosion testing ................................................................................................... 7 2.2.1 Sediment Erosion with Depth flume (Sedflume) ....................................................... 7 2.2.2 Slurry preparation ....................................................................................................... 9 2.2.3 Core preparation ......................................................................................................... 9 2.3 Physical properties ......................................................................................... 13 2.3.1 Grain size ................................................................................................................... 13 2.3.2 Bulk density ............................................................................................................... 13 2.3.3 Atterberg limits .......................................................................................................... 14 3 Results ............................................................................................................................. 15 3.1 Physical properties of test materials ..............................................................15 3.1.1 Atterberg limits .......................................................................................................... 15 3.1.2 Bulk density ............................................................................................................... 17 3.1.3 Grain size ................................................................................................................... 20 3.2 Erosion tests ................................................................................................... 22 3.2.1 Erosion parameterization ......................................................................................... 22 3.2.2 Sediment erosion rates ............................................................................................ 29 4 Summary and Conclusions ........................................................................................... 32 5 Future Work .................................................................................................................... 34 References ............................................................................................................................. 36 Appendix A: Grain Size Data ................................................................................................ 39 Appendix B: X-Ray Attenuation Bulk Density Plots .......................................................... 52 Appendix C: Erosion Data .................................................................................................... 57 Acronyms and Abbreviations ............................................................................................... 82 Report Documentation Pageen_US
dc.format.extent96 pages/10.16 MBen_US
dc.format.mediumPDFen_US
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/CHL TR-20-13en_US
dc.rightsApproved for Public Release; Distribution is Unlimiteden_US
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobaten_US
dc.subjectDredgingen_US
dc.subjectDredging spoilen_US
dc.subjectErosionen_US
dc.subjectMuden_US
dc.subjectSanden_US
dc.subjectDredging Operations and Environmental Research Program (U.S.)en_US
dc.titleErosion thresholds and rates for sand-mud mixturesen_US
dc.typeReporten_US
Appears in Collections:Technical Report
Technical Report

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