Effects of Shell Hash on Friction Angles of Surficial Seafloor Sediments near Oysters

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dc.contributor.authorConsolvo, Samuel T.en
dc.contributor.authorStark, Ninaen
dc.contributor.authorCastellanos, Bernardoen
dc.contributor.authorCastro-Bolinaga, Celso F.en
dc.contributor.authorHall, Stevenen
dc.contributor.authorMassey, Graceen
dc.date.accessioned2022-10-10T15:00:10Zen
dc.date.available2022-10-10T15:00:10Zen
dc.date.issued2022-09-01en
dc.description.abstractOysters are hypothesized to affect the shear strength of nearby surficial seafloor sediment as fragments of oyster shells (shell hash) are typically more angular relative to sand particles alone, among other differences. Resistance to shearing is well characterized by the friction angle, which is estimated in this study from vacuum triaxial laboratory and portable free-fall penetrometer field tests. Friction angles of sediment with shell hash were higher relative to those of sediment without shell hash (via hydrochloric acid treatment) on average by about 19% (36.0 degrees-30.2 degrees, respectively). Triaxial confining pressures ranged between 2.1 and 49.0 kPa to simulate subtidal and intertidal aquatic conditions. Regularity (average of particle roundness and sphericity) values of sediment samples with shell hash were found to be less than those of samples without by about 6% (0.66 and 0.70, respectively), which indicates the particle shapes of the former are, overall, more angular and less spherical. Further study and methodology improvements are needed to decrease the approximate 9 degrees friction angle discrepancy estimated from field- and laboratory-based tests. Knowing oysters have the potential to increase sediment shearing resistance helps establish a pathway of how shellfish colonies may contribute to mitigating surficial erosion around coastal infrastructure.en
dc.description.notesThe authors acknowledge funding from the National Science Foundation through grants CMMI-1820848 and CMMI-1820842. The authors thank Melody Thomas, Liz Smith, Matthew Campbell, Peter Mewis, Julie Paprocki, Paul Richardson, Brandon Puckett, and Paula Gillikin for fieldwork assistance. In addition to the fieldwork help, the authors also thank the graduate students in the coastal and marine geotechnics team and A.J. Prussin at Virginia Tech for laboratory and editorial aid. The authors also acknowledge Bruce Hatcher for helping to review this paper, as well as two anonymous reviewers and the associated editor whose comments contributed to the improvement of this article.en
dc.description.sponsorshipNational Science Foundation [CMMI-1820848, CMMI-1820842]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1061/(ASCE)WW.1943-5460.0000716en
dc.identifier.eissn1943-5460en
dc.identifier.issn0733-950Xen
dc.identifier.issue5en
dc.identifier.other4022015en
dc.identifier.urihttp://hdl.handle.net/10919/112122en
dc.identifier.volume148en
dc.language.isoenen
dc.publisherASCEen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectshear-strengthen
dc.subjectparticle-shapeen
dc.subjectquartz sanden
dc.subjectscouren
dc.subjectconsequencesen
dc.subjectpredictionen
dc.subjectdelta-c-13en
dc.subjectsignaturesen
dc.subjectstabilityen
dc.subjectdensityen
dc.titleEffects of Shell Hash on Friction Angles of Surficial Seafloor Sediments near Oystersen
dc.title.serialJournal of Waterway Port Coastal and Ocean Engineeringen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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