Local transparent boundary condition applied to the modeling of tropospheric ducting propagation

An efficient numerical scheme to simulate tropospheric ducting propagation (TDP) is presented in this paper. This scheme solves the parabolic equation (PE) approximation in conjunction with the finite-element method (FEM) and the local transparent boundary condition (LTBC) It is shown that a simple LTBC can be effectively used to account for the radiation in TDP, instead o f the recently published nonlocal transparent boundary condition (NTBC), wh ich is much more complex and consumes more computer time. (C) 1999 John Wil ey & Sons, Inc.