CSDMS 2019 Webinars

Cohesive and mixed sediment-transport processes in ROMS

Chris Sherwood USGS United States
Danielle Tarpley VIMS United States
Alfredo Aretxabaleta USGS United States

The Regional Ocean Modeling System (ROMS) is an open-source regional ocean model with a large user community. The version distributed as part of the Coupled Ocean–Atmosphere–Wave–Sediment Transport Modeling System (COAWST) includes two-way coupling with the atmosphere model WRF and the wave model SWAN, and contains routines for transport of non-cohesive sediment, biogeochemical processes, seagrass growth, and wave-flow-vegetation interactions. Recently, we implemented algorithms for treating cohesive and mixed sediment. These include the following: floc dynamics (aggregation and disaggregation in the water column); changes in floc characteristics in the seabed; erosion and deposition of cohesive and mixed (combination of cohesive and non-cohesive) sediment; and biodiffusive mixing of bed sediment. Additionally, changes to the sediment bed layering scheme were made that improve the fidelity of the modeled stratigraphic record. In this webinar, we will describe and demonstrate this new functionality and provide examples of these modules implemented in idealized test cases and a realistic application.

References: Sherwood, C.R., A.L. Aretxabaleta, C.K. Harris, J.P. Rinehimer, R. Verney, B. Ferré. 2018. Cohesive and mixed sediment in the Regional Ocean Modeling System (ROMS v3.6) implemented in the Coupled Ocean Atmosphere Wave Sediment-Transport Modeling System (COAWST r1179). Geoscientific Model Development;

Tarpley, D.R., C.K. Harris, C.T. Friedrichs, and C.R. Sherwood. 2019. Tidal variation in cohesive sediment distribution and sensitivity to flocculation and bed consolidation in an idealized, partially mixed estuary. Journal of Marine Science and Engineering (JMSE); 7: 334; doi:10.3390/jmse7100334.

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Of interest for:
  • Coastal Working Group
  • Marine Working Group
  • Hydrology Focus Research Group
  • Chesapeake Focus Research Group
  • Ecosystem Dynamics Focus Research Group