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Development of Process-based Sediment Transport Model in MPAS-O

Development of Process-based Sediment Transport Model in MPAS-O. Zhendong Cao and Phillip J. Wolfram Los Alamos National Laboratory March 20, 2019. Why coastal sediment transport matters?. Bathymetry change Coastline migration Landscape evolution. Argow & Fitzgerald 2006. Google Maps.

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Development of Process-based Sediment Transport Model in MPAS-O

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  1. Development of Process-based Sediment Transport Model in MPAS-O Zhendong Cao and Phillip J. Wolfram Los Alamos National Laboratory March 20, 2019

  2. Why coastal sediment transport matters? Bathymetry change Coastline migration Landscape evolution Argow & Fitzgerald 2006 Google Maps BGC cycle Vegetation Resistance Aquatic habitats Coastal Ecosystem Increasing spatial scale Water turbidity, density and stratification Light penetration Photosynthesis Credit: a.nek.mail.ru Increasing temporal scale

  3. Why coastal sediment transport is difficult to model? • Model parameterization • Sediment settling • Bed erodibility • Critical shear for erosion/deposition • Nonlinear mutual feedback with • Vegetation • Morphology • Hydrodynamics • Human-earth interactions • Climate change • Sediment multi-physics Open University, 1999

  4. How to model coastal sediment transport? • Process-based sediment transport models • COAWST (Warner et al., 2010) • FVCOM (Chen et al., 2013) • MORSELFE, SELFE (Lopez and Baptista, 2017) • Delft3D (User manual, 2014) • Sediment transport = suspended load + bed load • Suspended load -- three-dimensional scalar equation +deposition + erosion • Bed load-- empirical formulae (Delft3D manual, p.347) In COAWST: Meyer-Peter-Muller (1948) Soulsby and Damgaard (2005) Same as FVCOM and SELFE.

  5. Coastal sediment transport for BGC Argow & Fitzgerald 2006 Franz et al., 2015 Argow & Fitzgerald 2006

  6. Development of Process-based Sediment Transport Model in MPAS-O Zhendong Cao and Phillip J. Wolfram Los Alamos National Laboratory March 20, 2019

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