ROTAN is a GIS-based catchment hydrology and water quality model that models the effects of land-use change and nitrogen mitigation measures such as riparian margins and plant uptake on nitrogen export to waterways. This model is based on the Scandanavian HBV and HBV-N models in which soils and aquifers are modelled as a series of fully-mixed reservoirs (buckets) connected in series and parallel. ROTAN has been developed by NIWA and has been used in policy formulation related to the Lake Rotorua catchment.
ROTAN is used for the prediction of nitrate inputs to lakes for various land use, rainfall, and mitigation scenarios.
|State of Development||Closed Beta|
|Current Development Activity||Nil|
|Intended End Users||
|Spatial Extents||Local (i.e. Catchment or District)|
|Temporal Resolutions||Days, Months|
|Temporal Extents||Days, Months|
|Steady State or Dynamic||Dynamic|
|Level of Integration||Environmental|
|Key Input Data||Land Use, Rainfall, Land Cover, Potential Evaporation|
|Input Data Formats||GIS compatible files|
|Key Output Data||Runoff, Drainage water flows and nitrogen concentrations|
|Output Data Formats||GIS Compatible Files|
|Open/Closed Source||Closed Source|
|Not available for non-commercial use|
|Not available for commercial use|
|Operating Systems||MS Windows ArcGIS|
|User Interface||Graphical desktop|
|Ease of Use||Difficult Not intended for use outside the NIWA research group that developed it. Little work done on user manuals, help screens, or internal checking.|
|Use in Policy Process||Plan (Policy Formulation)|
Rucinski, D., S. Wadhwa, J. C. Rutherford. (2006). ROTAN - ROtorua and TAupo Nitrate Model. User's Guide. Hamilton, NIWA.
|Support||None outside NIWA|
|Users Forum||None outside NIWA|
|Programming Language||ESRI Visual Basic|
|Methods included for calibration and validation||Calibrated by fitting to measured flows and nitrogen concentrations in streams, and to published annual nitrogen loads entering the lake.|
|Methods included for managing uncertainty||Goodness of fit quantified (RMS error)|
Based on the Scandanavian HBV and HBV-N models. Soils and aquifers are modelled as a series of fully-mixed reservoirs (buckets) connected in series and parallel.
|Keywords||Nitrogen, Land use, Lake, eutrophication|
|Linkages to other Models|
Nitrogen exports from Lake Rotorua catchment - Calibration of the ROTAN Model. http://www.boprc.govt.nz/media/33484/Report-090806-NitrogenExportsLkRotoruaCatchment.pdf