Trafficability, or ease of travel, is dictated by both soil strength and surface friction, and decreases in the presence of an ice or snow layer or when the top of the ground becomes too wet. The ability to predict the state of the ground is essential to manned and unmanned vehicle mobility and personnel movement, and to determine sensor performance for military and civilian activities.
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The code is written in FORTRAN95 and is publicly available. At a minimum, the only weather information required is air temperature. It allows for 22 different terrain materials, including asphalt, concrete, bedrock, permanent snow, and Unified Soil Classification System (USCS) soil types. 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.įASST is designed to accommodate a range of users, from those having intricate knowledge of a site to those knowing only the site location. 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. 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.
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