Title: DANSAT
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ANSWERS-2000 is a distributed parameter, physically-based, continuous
simulation, watershed scale, upland planning model developed for evaluating
the effectiveness of agricultural and urban BMPs in reducing sediment and
nutrient delivery to streams in surface runoff and leaching of nitrogen
through the root zone. The model is intended for use by planners on ungaged
watersheds where data for model calibration is not available. The model
divides the area simulated into a uniform grid of square (1 hectare or
smaller), within which all properties (surface and subsurface soil properties,
vegetation, surface condition, crop management, and climate) are assumed
homogeneous. The model uses breakpoint precipitation data and simulates
hydrologic processes with a 30-second time step during runoff events and with
a daily time step between runoff events. The model simulates interception;
surface retention/detention; infiltration; percolation; sediment detachment
and transport of mixed particle size classes in rills, interrill areas, and
channels; crop growth; plant uptake of nutrients; N and P dynamics in the
soil; nitrate leaching; and losses of nitrate, ammonium, total Kjeldahl
nitrogen, and P in surface runoff as affected by soil, nutrient, cover and
hydrologic conditions. The model has an ArcView based user interface,
QUESTIONS, that facilitates data file creation and manipulation. Model
documentation and user support is very limited. The model is currently
only suitable for use by expert modelers with a good knowledge of upland
hydrology and agriculture. The current version of the model makes heavy
use of relationships derived from the WEPP and EPIC models.
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Hydrologic
Processes
Simulated by ANSWERS-2000
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Maintained by Theo Dillaha, Professor of Biological Systems
Engineering,
Virginia Tech, Blacksburg, VA 24061-0303,
Phone: 540-231-6813,
Fax: 540-231-3199, E-mail: dillaha@vt.edu
copyright ⓒ 2003 Biological Systems Engineering Dept at Virginia Tech. All Rights Reserved.
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