title: Extending the MODPATH Algorithm to Rectangular Unstructured Grids.
abstract: The recent release of MODFLOW-USG, which allows model grids to have irregular, unstructured connections, requires a modification of the particle-tracking algorithm used by MODPATH. This paper describes a modification of the semi-analytical particle-tracking algorithm used by MODPATH that allows it to be extended to rectangular-based unstructured grids by dividing grid cells with multi-cell face connections into sub-cells. The new method will be incorporated in the next version of MODPATH which is currently under development.
authors.affiliation: U.S. Geological Survey, 411 National Center, Reston, VA 20192. dwpolloc@usgs.gov.
authors.forename: David W
authors.initials: DW
authors.lastname: Pollock
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D060587:Groundwater; D062070:Hydrology; D014872:Water Movements