3-D hybrid Eulerian-Lagrangian / particle tracking model for simulating mass transport in coastal water bodies

The purpose of this research is the development and analysis of a three-dimensional finite-element Eulerian-Lagrangian / particle tracking model for the simulation of passive pollutant transport in coastal areas. Particular emphasis is given on the simulation of pollution sources (e.g. outfalls) whose spatial extend is small compared to that of the domain discretization. A hybrid particle tracking / Eulerian-Lagrangian method is developed and analyzed for the simulation of small scale sources: Mass discharge from the source is modeled by the release of particles. When the standard deviation of the particle distribution reaches a length scale of the order of the grid scale particle locations are mapped onto node concentrations and the calculations proceed in the Eulerian-Lagrangian mode. A technique for the interfacing of the particle tracking mode and the Eulerian-Lagrangian mode is developed. The developed method for the simulation of sources is applied for the simulation of outfalls in coastal water problems. The issue of consistently modeling the intermediate flow field around the diffuser is investigated. In order to demonstrate the performance of the developed model it is applied in Massachusetts Bay. Thesis Supervisor: E. Eric Adams Title: Lecturer

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