Model:Hydrostreamer

Hydrostreamer

Also known as
Model type	Tool
Model part of larger framework
Note on status model
Date note status model

Incorporated models or components:

Spatial dimensions	1D
Spatial extent	Landscape-Scale
Model domain	Hydrology
One-line model description	HydroStreamer downscales coarse-resolution global runoff products onto local river networks using areal interpolation, vector-based river routing, and multi-model ensemble averaging to produce improved streamflow estimates with minimal calibration requirements.
Extended model description	HydroStreamer is an R package designed to improve the usability of existing global runoff products by addressing the modifiable area unit problem — the mismatch between the spatial units in which runoff data are provided and those needed for a specific analysis. Its workflow consists of three steps: interpolating runoff from source zones to target zones, routing the interpolated runoff through a vector-based river network, and optionally assimilating multiple runoff products and observed discharge data via model averaging. The package was tested by downscaling coarse-resolution global runoff products from ISIMIP over the 3S Basin in Southeast Asia, achieving comparable or improved performance relative to benchmark streamflow products while requiring minimal data and no extensive calibration.

Keywords:	Streamflow downscaling, Runoff interpolation, River routing,

Supported platforms	Unix, Linux, Mac OS, Windows
Other platform
Programming language
Other program language	R
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	2018
Does model development still take place?	No
If above answer is no, provide end year model development	2021
Code development status	As is, no updates are provided
When did you indicate the 'code development status'?	2026
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/mkkallio/hydrostreamer
Source csdms web address
Program license type	BSD or MIT X11
Program license type other
Memory requirements	--
Typical run time	--

Describe input parameters	distributed runoff time series in raster format — a multi-layer raster where each layer is a timestep, typically sourced from global products like ISIMIP, LORA, or GRUN at 0.5° resolution. These are usually in NetCDF format (binary). Second, a vector river network in a topologically clean format such as a shapefile or GeoPackage — binary vector format. HydroSHEDS is the recommended source for this.
Input format	Binary
Other input format	Outputs are primarily R objects (data frames and simple feature objects) returned in-memory, containing estimated discharge for each river segment as a time series, interpolated runoff per segment, and optionally model averaging weights and combined multi-model streamflow predictions.
Describe output parameters
Output format	ASCII
Other output format
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	No
Describe post-processing software
Visualization software needed?	No
If above answer is yes
Other visualization software

Describe processes represented by the model	See Kallio, M., Guillaume, J. H. A., Virkki, V., Kummu, M., and Virrantaus, K.: Hydrostreamer v1.0 – improved streamflow predictions for local applications from an ensemble of downscaled global runoff products, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-14-5155-2021, 2021.
Describe key physical parameters and equations	Kallio, M., Guillaume, J. H. A., Virkki, V., Kummu, M., and Virrantaus, K.: Hydrostreamer v1.0 – improved streamflow predictions for local applications from an ensemble of downscaled global runoff products, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-14-5155-2021, 2021.
Describe length scale and resolution constraints	--
Describe time scale and resolution constraints	--
Describe any numerical limitations and issues	--

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets
Upload test data sets if available:
Describe ideal data for testing

Do you have current or future plans for collaborating with other researchers?

Is there a manual available?	No
Upload manual if available:
Model website if any
Model forum / discussion board

Comments

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Model info

Authors

Marko Kallio

Source code

Model citations

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Kallio, Marko; Guillaume, Joseph H. A.; Virkki, Vili; Kummu, Matti; Virrantaus, Kirsi; 2020. Hydrostreamer v1.0 – improved streamflow predictions for localapplications from an ensemble of downscaled global runoff products. , . 10.5194/gmd-2020-276	cc-by · acceptedVersion	2020	a module application description	7