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dc.contributor.authorBouraoui, Faycalen_US
dc.date.accessioned2014-03-14T21:21:37Z
dc.date.available2014-03-14T21:21:37Z
dc.date.issued1994-04-18en_US
dc.identifier.otheretd-10192006-115604en_US
dc.identifier.urihttp://hdl.handle.net/10919/39996
dc.description.abstractANSWERS, an event-oriented, distributed parameter nonpoint source pollution model for simulating runoff and sediment transport was modified to develop a continuous nonpoint source model to simulate runoff, erosion, transport of dissolved and sediment-bound nutrients, and nutrient transfonnations. The model was developed for use by nonpoint source pollution managers to study the long-tenn effectiveness of best management practices (BMPs) in reducing runoff, sediment, and nutrient losses from agricultural watersheds. The Holtan's infiltration equation used in the original version of ANSWERS was replaced by the physically-based Green-Ampt infiltration equation. Soil evaporation and plant transpiration were modeled separately using the Ritchie equation. If soil moisture exceeds field capacity, the model computes percolation based on the degree of soil saturation. Nutrient losses include nitrate, sediment-bound and dissolved ammonium; sediment-bound TKN, and sediment-bound and dissolved phosphorus. A linear equilibrium is assumed between dissolved and sediment-bound phases of ammonium and phosphorus. Nutrient loss is assumed to occur only from the upper cm of the soil profile. The model simulates transfonnations and interactions between four nitrogen pools including stable organic N, active organic N, nitrate and ammonium. Transfonnations of nitrogen include mineralization simulated as a combination of ammonification and nitrification, denitrification, and plant uptake of ammonium and nitrate. The model maintains a dynamic equilibrium between stable and active organic N pools.en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1994.B687.pdfen_US
dc.subjectWatershed management Mathematical modelsen_US
dc.subjectSediment transport Mathematical modelsen_US
dc.subjectRunoff Mathematical modelsen_US
dc.subject.lccLD5655.V856 1994.B687en_US
dc.titleDevelopment of a continuous, physically-based distributed parameter, nonpoint source modelen_US
dc.typeDissertationen_US
dc.contributor.departmentAgricultural Engineeringen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairDillaha, Theo A. IIIen_US
dc.contributor.committeememberHeatwole, Conrad D.en_US
dc.contributor.committeememberMostaghimi, Saieden_US
dc.contributor.committeememberLoganathan, G. V.en_US
dc.contributor.committeememberGilliam, J. W.en_US
dc.contributor.committeememberPerumpral, John V.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10192006-115604/en_US
dc.date.sdate2006-10-19en_US
dc.date.rdate2006-10-19
dc.date.adate2006-10-19en_US


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