Opus: An Integrated Simulation Model for Transport of Nonpoint-Source Pollutantsat the Field Scale. Volume 2, User Manual

摘要

The Opus (not an acronym) model simulates interaction of water movement with theapplication, transformation, and movement of nonpoint-source pollutants in an agricultural field. The modeled processes include hydrology, erosion, weather, crop growth, agricultural management, nutrient cycling and transport, and pesticide fate. The field size is limited to catchments with a single raingage record and a single soil profile. Time scales vary by process and conditions: from fractions of a second in some hydrologic components to years in annual management cycles. Many processes proceed on a daily time step. The document describes the use of the computer program. Input variables and parameters are described, and relationships among some are explained.