The one-dimensional dynamic state-of-the-ground model FASST (Fast All-season Soil STrength) was developed by researchers at the Engineer Research and Development Center's Cold Regions Research and Engineering Laboratory (ERDC-CRREL) as part of the Army's Battlespace Terrain Reasoning and Awareness research program. FASST calculates the ground's moisture and/or ice content, temperature, and freeze/thaw profiles, as well as soil strength and surface ice and snow accumulation/depletion. FASST's fundamental operations are the calculation of an energy and water budget that quantifies both the flow of heat and moisture within the soil and also the exchange of heat and moisture at all interfaces (ground/air or ground/snow; snow/air) using both meteorological and terrain data. FASST is designed to accommodate a range of users, from those having intricate knowledge of a site to those knowing only the site location. It allows for 22 different terrain materials, including asphalt, concrete, bedrock, permanent snow, and Unified Soil Classification System (USCS) soil types. At a minimum, the only weather information required is air temperature. The code is written in FORTRAN and is publicly available.
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