- Title
- Potential improvements to statistical downscaling of general circulation model outputs to catchment streamflows with downscaled precipitation and evaporation
- Creator
- Sachindra, Dhanapala; Huang, Fuchun; Barton, Andrew; Perera, Bimalka
- Date
- 2014
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/97879
- Identifier
- vital:10261
- Identifier
-
https://doi.org/10.1007/s00704-014-1288-7
- Identifier
- ISSN:0177-798X
- Abstract
- An existing streamflow downscaling model (SDM(original)), was modified with the outputs of a precipitation downscaling model (PDM) and an evaporation downscaling model (EDM) as additional inputs, for improving streamflow projections. For this purpose, lag 0, lag 1 and lag 2 outputs of PDM were individually introduced to SDM(original) as additional inputs, and then it was calibrated and validated. Performances of the resulting modified models were assessed using Nash-Sutcliffe efficiency (NSE) during calibration and validation. It was found that the use of lag 0 precipitation as an additional input to SDM(original) improves NSE in calibration and validation. This modified streamflow downscaling model is called SDM(lag0_preci). Then lag 0, lag 1 and lag 2 evaporation of EDM were individually introduced to SDM(lag0_preci) as additional inputs and it was calibrated and validated. The resulting models showed signs of over-fitting in calibration and under-fitting in validation. Hence, SDM(lag0_preci) was selected as the best model. When SDM(lag0_preci) was run with observed lag 0 precipitation, a large improvement in NSE was seen. This proved that if precipitation produced by the PDM can accurately reproduce the observations, improved precipitation predictions will produce better streamflow predictions. © 2014, Springer-Verlag Wien.
- Publisher
- Springer-Verlag Wien
- Relation
- Theoretical and Applied Climatology Vol. 122, no. 1-2 (2014), p. 159-179
- Rights
- Copyright © 2014, Springer-Verlag Wien.
- Rights
- This metadata is freely available under a CCO license
- Subject
- 0401 Atmospheric Sciences; Calibration; Catchment; Climate modeling; Downscaling; Evaporation; General cirulation model; Model validation; Precipitation (climatology); Stream flow; Weather forecasting
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