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PREDICTION OF MINERAL QUALITY OF IRRIGATION RETURN FLOW. VOLUME V. DETAILED RETURN FLOW SALINITY AND NUTRIENT SIMULATION MODEL
Citation:
PREDICTION OF MINERAL QUALITY OF IRRIGATION RETURN FLOW. VOLUME V. DETAILED RETURN FLOW SALINITY AND NUTRIENT SIMULATION MODEL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-77/179e.
Description:
A return flow quality simulation model is described which models the plant-soil-aquifer system from the soil surface to a tile or open drain. Processes simulated include evapotranspiration, unsaturated and saturated water flow, solution-precipitation of slightly soluble salts, ion exchange, ion pairing, nitrogen transformations, crop uptake of nitrogen, and the movement and redistribution of salts and nutrients. The dynamic non-steady-state model predicts the concentrations of calcium, magnesium, sodium, ammonium, bicarbonate, carbonate, chloride, sulfate, NO3-N, and Urea-N contained in soil, aquifer, and drain waters. Concentrations of organic-N; exchangeable calcium, magnesium, sodium, and ammonium; and gypsum are predicted within the soil and aquifer materials. Users' manuals for each basic subprogram are included, and a sample problem illustrates the use of the model. Model output can serve as input to the conjunctive use model described in Volume III; serve as input to other models on a nodal or point source basis; or stand alone depending on the type and scope of the particular study.