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• W349417159 abstract "This paper presents three modelling approaches commonly used to estimate the nutrient balance within large catchments and outlines the rationale of the different model constructs. Each model is evaluated by application to a catchment in north central Victoria, Australia, that has an area of 371,000 ha and comprises mixed landuse enterprises. The catchment is also in connection with a groundwater system that contributes on average 20% of streamflow. Model results are shown to compare favourably with available nitrate observation data. However results indicate that the lumped and extrapolated approaches, whilst easily calibrated to stream flow data, do not adequately describe the within-catchment processes. The physics- based model is the only approach capable of representing spatially explicit surface water, leached water and groundwater concentrations across the catchment. This modelling approach identified the importance of transport of nitrate within overland flow events and groundwater discharge to stream, a hitherto undocumented process within the study catchment. The objectives of this paper are to (i) contrast the development rationale and basic assumptions currently embedded into existing modelling approaches to estimate catchment nutrient balances, (ii) evaluate and compare the capacity of the different models to account for land management changes by application to a focus catchment and (iii) present the strengths and weaknesses of each of the modelling approaches. Presented results suggest that the physics-based catchment modelling approach has superior predictive capability to account for the impacts of land management change than the process-based and generation rate-based approaches. However until the landscape attenuation and transformation processes are generalised with confidence for inclusion into the more physics-based catchment models it is recommended that the generation rate-based approach linked to a catchment model capable of predicting hydrologic pathways at the land management scale be adopted. This paper concluded that all of the modelling approaches evaluated require further development." @default.
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• W349417159 date "2009-01-01" @default.
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• W349417159 title "An evaluation of several approaches to estimate impacts of landuse change on nutrient and hydrologic balances" @default.
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