Opus: An Integrated Simulation Model for Transport of Nonpoint-Source Pollutants at the Field Scale. Volume 1, Documentation.

摘要

Opus (not an acronym) is a computer model for the transport of material in soil and surface water. The model is a simulation tool for studying the potential pollution from various agricultural management practices. It simulates water movement that results from rainfall and other weather inputs and that is affected by soil, crop, topography, and many types of management actions and water use influencing the surface condition. Opus includes models for the growth of plants; development of cover, water use; uptake of nutrients; cycling of soil nitrogen, phosphorus, and carbon, transport of adsorbed pesticide and nutrients; interaction of surface water and soil water; runoff; and erosion. This tool allows the user to choose between (1) detailed simulation involving data on the time-intensity pattern of rainfall and (2) a more lumped approach using either recorded daily rainfall or stochastically generated rainfall. To illustrate its use, Opus is applied to a set of rather comprehensive data from a watershed study in Watkinsville, GA.