Use of the PTM with CMS Quadtree Grids.

摘要

This Coastal and Hydraulics Engineering Technical Note (CHETN) describes procedures to set up a particle tracking simulation through coupling the Coastal Modeling System (CMS) with a quadtree grid and Version 2.1 of the Particle Tracking Model (PTM) in the Surface-water Modeling System (SMS). A CMS/PTM application is presented to demonstrate the recent changes in the SMS interface of the PTM. The CMS, developed by the Coastal Inlets Research Program (CIRP), is an integrated wave, current, sediment transport, and morphology change model for coastal and inlet applications (Sanchez et al. 2011; Lin et al. 2008). The Particle Tracking Model (PTM) was developed jointly by CIRP and the Dredging Operations and Engineering Research (DOER) program as a tool to compute the fate and pathways of sediments and other waterborne particulates in coastal engineering and dredging operations (MacDonald et al. 2006). Coupling of the CMS with the PTM is implemented in the SMS (Demirbilek et al. 2008; Aquaveo 2010; Li et al. 2011). Recently, the CMS model has been extended by introducing a quadtree grid solution scheme (Wu et al. 2010), a local grid refinement that can be used to better resolve nearshore hydrodynamic processes. The quadtree approach uses successive splitting of neighboring cells into four sub-cells as often as required. This produces non-uniform cells in parts of modeling domain (e.g., cell size is not constant). All cells are numbered in sequence and pointers are used to determine the connectivity with neighboring cells.