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The mean suspended sediment concentration profile of silty sediments under wave-dominant conditions
- Source :
- Continental Shelf Research, 186
- Publication Year :
- 2019
-
Abstract
- Suspended sediment concentration (SSC) is one of the fundamental topics in sediment study. The parameterization of the SSC profile of silty sediments is still under-researched. This study focuses on the mean SSC profile for silty sediments under non-breaking wave-dominant conditions. First, inspired by a 1DV model, different types of the distribution of mean eddy viscosity were proposed, i.e., a toe-type distribution over flat bed and a constant-toe type distribution over rippled bed. Then, the time-averaged diffusion equation for suspended sediment transport was analytically solved, and expressions for the mean SSC profiles were derived. The expressions involve several basic physical processes, including the effects of bed forms, stratification, hindered settling and mobile bed. Verification using a number of experimental datasets showed that the proposed expressions can properly calculate the mean SSC for silt and are applicable for sand as well. In conclusion, this research provides an approach to estimate the mean SSC for silty sediments under wave-dominant conditions, which is expected to be applicable for engineering practice and numerical modelling.
- Subjects :
- 0106 biological sciences
Diffusion equation
010504 meteorology & atmospheric sciences
Sediment concentration profile
010604 marine biology & hydrobiology
Turbulence modeling
Stratification (water)
Sediment
Silty sediment
Geology
Soil science
Aquatic Science
Silt
Oceanography
Eddy viscosity
01 natural sciences
Sediment concentration
Settling
Sediment diffusivity
Rippled bed
Sediment transport
Flat bed
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 02784343
- Volume :
- 186
- Database :
- OpenAIRE
- Journal :
- Continental Shelf Research
- Accession number :
- edsair.doi.dedup.....86a20d99b082c684eba80125c111c1f1