User's Guide for the Air Force Surface-Layer Windflow Model (AFWIND)

摘要

AFWIND is a two-dimensional (xy plane) surface-layer wind flow model for complex terrain. The model runs on most IBM-compatible microcomputers with enhanced graphics capability. The model accepts single or multiple observations of surface winds. The model then performs a variational analysis of the windfield, adjusting the winds through a relaxation technique until the windfield conforms to effects of topography, stability, ambient flow conditions, and mass continuity. Atmospheric stability is determined from either date/time, wind speed, and cloud cover, or from vertical temperature profile measurements. The model is designed to produce high resolution wind analyses, typically running on domains on th order of 10 x 10 km, with horizontal grid spacing of 100 to 200 m. This report describes the structure of the computer code and the input data requirements. An example run is given. Keywords: Atmosphere models; Complex terrain. (EDC)