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dc.contributor.authorBidwell, Vince J.
dc.contributor.authorLilburne, Linda
dc.contributor.authorGood, John
dc.date.accessioned2011-05-04T22:53:04Z
dc.date.available2011-05-04T22:53:04Z
dc.date.issued2005
dc.identifier.citationBidwell, V.J., Lilburne, L. R., & Good, J.M. (2005). Strategy for developing GIS-based tools for management of the effects on groundwater of nitrate leaching from agricultural land use. In A. Zerger & R. M. Argent (Eds.), MODSIM 2005 International Congress on Modelling and Simulation, Melbourne, December 2005, (pp. 1354-1360). Modelling and Simulation Society of Australia and New Zealand.en
dc.identifier.isbn0975840002
dc.identifier.urihttps://hdl.handle.net/10182/3496
dc.descriptionConference paper presented at the MODSIM05, International Congress on Modelling and Simulation, held December 2005, University of Melbourne, Victoria.en
dc.description.abstractThe end user requirement for this development is to be able to assess the impact of land use changes on groundwater quality, specifically that due to nitrate leaching from agriculture. Implementation will be for alluvial plains at scales up to about 2000 km². GIS databases provide information on land use and soils. This information, at individual field and farm scale, enables modelling of nitrate leaching by the companion FarmSim model that is run on a daily time basis in response to climate, soils, crop, and farm management options. The output leaching data are in the form of mean annual drainage and an associated value of average concentration. Upscaling of farm-scale nitrate leaching to the effects on groundwater quality is achieved by use of a steady-state, groundwater flow and contaminant transport models (AquiferSim). A 2-D horizontal groundwater flow model provides a piezometric surface along which land use changes and affected groundwater zones can be related by means of gradient searches that locate principal directions of groundwater flow. Along these principal directions, the horizontal and vertical dispersive transport of nitrate can be assessed within a 2-D vertical, steady-state, groundwater flow model based on stream function analysis. The stream function model allows simulation of steadystate contaminant transport for complex land use patterns and spatially varying aquifer properties, in the form of a mixing-cell model based on the computational grid. The cell size of this model is set to control numerical dispersion, as a surrogate for dispersion in the aquifer, caused by the horizontal and vertical components of the groundwater flux. The resulting distribution of nitrate concentration with depth in the aquifer can thus be determined for any location in relation to the upstream land uses. The transport model also simulates groundwater age, which is treated as a solute undergoing first-order growth. Spatial distribution of groundwater age and steady-state nitrate concentration addresses some of the end user questions that usually require a transient transport model. The groundwater models have been developed as prototypes with Microsoft Excel. These proven computational methods will be incorporated into an application to run on the Microsoft .NET framework. This application is being used as the software architecture that connects GIS databases, nitrogen leaching models, vadose zone and groundwater transport models, to user interfaces and information output displays.en
dc.language.isoenen
dc.publisherLincoln Ventures Ltd.en
dc.relationOriginal publication available from: www.mssanz.org.auen
dc.relation.urihttp://www.mssanz.org.auen
dc.rightsCopyright © The Authors. The responsibility for the contents of this paper rests upon the authors and not on the Modelling and Simulation Society of Australia and New Zealand Inc.en
dc.subjectcontaminant transporten
dc.subjectstream functionen
dc.subjectmixing cellen
dc.subject.NETen
dc.subjectCanterbury Plainsen
dc.titleStrategy for developing GIS-based tools for management of the effects on groundwater of nitrate leaching from agricultural land useen
dc.typeConference Contribution - Publisheden
lu.contributor.unitLincoln Venturesen
dc.subject.anzsrc050205 Environmental Managementen
dc.subject.anzsrc040603 Hydrogeologyen
lu.subtypeConference Paper


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