Modelling water, sediment and nutrient fluxes from a mixed land-use catchment in New Zealand: effects of hydrologic conditions on SWAT model performance

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dc.contributor.authorMe, W.en_NZ
dc.contributor.authorAbell, Jonathan Michaelen_NZ
dc.contributor.authorHamilton, David P.en_NZ
dc.date.accessioned2015-07-15T23:08:23Z
dc.date.available2015-04-29en_NZ
dc.date.available2015-07-15T23:08:23Z
dc.date.issued2015-04-29en_NZ
dc.description.abstractThe Soil Water Assessment Tool (SWAT) was configured for the Puarenga Stream catchment (77 km2), Rotorua, New Zealand. The catchment land use is mostly plantation forest, some of which is spray-irrigated with treated wastewater. A Sequential Uncertainty Fitting (SUFI-2) procedure was used to auto-calibrate unknown parameter values in the SWAT model which was applied to the Puarenga catchment. Discharge, sediment, and nutrient variables were then partitioned into two components (base flow and quick flow) based on hydrograph separation. A manual procedure (one-at a-time sensitivity analysis) was then used to quantify parameter sensitivity for the two hydrologically-separated regimes. Comparison of simulated daily mean discharge, sediment and nutrient concentrations with high-frequency, event-based measurements allowed the error in model predictions to be quantified. This comparison highlighted the potential for model error associated with quick-flow fluxes in flashy lower-order streams to be underestimated compared with low-frequency (e.g. monthly) measurements derived predominantly from base flow measurements. To overcome this problem we advocate the use of high-frequency, event-based monitoring data during calibration and dynamic parameter values with some dependence on discharge regime. This study has important implications for quantifying uncertainty in hydrological models, particularly for studies where model simulations are used to simulate responses of stream discharge and composition to changes in irrigation and land management.
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dc.identifier.citationMe, W., Abell, J. M., & Hamilton, D. P. (2015). Modelling water, sediment and nutrient fluxes from a mixed land-use catchment in New Zealand: effects of hydrologic conditions on SWAT model performance. Hydrology and Earth System Sciences Discussions, 12(4), 4315–4352. http://doi.org/10.5194/hessd-12-4315-2015en
dc.identifier.doi10.5194/hessd-12-4315-2015en_NZ
dc.identifier.eissn1812-2116en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/9466
dc.language.isoen
dc.publisherEuropean Geosciences Unionen_NZ
dc.relation.isPartOfHydrology and Earth System Sciences Discussionsen_NZ
dc.relation.urihttp://www.hydrol-earth-syst-sci-discuss.net/12/4315/2015/hessd-12-4315-2015.htmlen_NZ
dc.rights© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License.
dc.titleModelling water, sediment and nutrient fluxes from a mixed land-use catchment in New Zealand: effects of hydrologic conditions on SWAT model performanceen_NZ
dc.typeJournal Article
pubs.begin-page4315
pubs.elements-id128531
pubs.end-page4352
pubs.issue4en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/School of Science
pubs.volume12en_NZ
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