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Effects of Shell Hash on Friction Angles of Surficial Seafloor Sediments near Oysters
| 题名： | Effects of Shell Hash on Friction Angles of Surficial Seafloor Sediments near Oysters |
| 正文语种： | eng |
| 作者： | Samuel T. Consolvo;Nina Stark;Bernardo Castellanos;Celso F. Castro-Bolinaga;Steven Hall;Grace Massey |
| 作者单位： | CDM Smith Inc. Boston MA 02109 Dept. of Civil and Environmental Engineering Virginia Tech Blacksburg VA 24061;Dept. of Civil and Environmental Engineering Virginia Tech Blacksburg VA 24061;Dept. of Civil and Environmental Engineering Virginia Tech Blacksburg VA 24061;Dept. of Biological and Agricultural Engineering North Carolina State Univ. Raleigh NC 27606;Dept. of Biological and Agricultural Engineering North Carolina State Univ. Raleigh NC 27606;Dept. of Physical Sciences Virginia Inst. of Marine Science Gloucester Point VA 23062 |
| 摘要： | Oysters 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°-30.2°, 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° 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. |
| 出版年： | 2022 |
| 期刊名称： | Journal of Waterway, Port, Coastal and Ocean Engineering |
| 卷： | 148 |
| 期： | 5 |
| 页码： | 04022015.1-04022015.15 |
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