LONG-TERM GOALS

To develop a robust multi-phase, multi-class numerical modeling framework for both cohesive and non-cohesive sediment transport in the fluvial, estuarine and coastal environments. OBJECTIVES 1. Developing a 3D turbulence-resolving numerical model for fine sediment transport in the oscillatory boundary layer in order to understand how turbulence-sediment interactions can determine the state of muddy seabed (transport modes). 2. Studying the interplay between the rheological stress and turbulence modulation in determining the transition of flow modes and hydrodynamic dissipation. 3. Extending the existing turbulence-resolving numerical study to coarser grain (sand) and poly-dispersed (e.g., size, density and shape) transport based on four-way-coupled Eulerian and Euler-Lagrangian numerical frameworks. SIGNIFICANCE Understanding various modes of sediment transport and the resulting transport rate driven by waves and currents are critical to better predictions of hydrodynamic, seabed properties, morphodynamics in the coastal environments. Through an enhanced/reduced bottom friction due to seabed processes