Hydrostreamer v1.0 – improved streamflow predictions for local applications from an ensemble of downscaled global runoff products
<p>An increasing number of different types of hydrological, land surface, and rainfall–runoff models exist to estimate streamflow in river networks. Results from various model runs from global to local scales are readily available online. However, the usability of these products is often limit...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-08-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/14/5155/2021/gmd-14-5155-2021.pdf |
| Summary: | <p>An increasing number of different types of hydrological,
land surface, and rainfall–runoff models exist to estimate streamflow in
river networks. Results from various model runs from global to local scales
are readily available online. However, the usability of these products is
often limited, as they often come aggregated in spatial units which are not
compatible with the desired analysis purpose. We present here an R package,
a software library <i>Hydrostreamer v1.0</i>, which aims to improve the usability of existing runoff
products by addressing the modifiable area unit problem and allows
non-experts with little knowledge of hydrology-specific modelling issues and
methods to use them for their analyses. Hydrostreamer workflow includes (1) interpolation from source zones to target zones, (2) river routing, and (3) data assimilation via model averaging, given multiple input runoff and
observation data. The software implements advanced areal interpolation
methods and area-to-line interpolation not available in other products and
is the first R package to provide vector-based routing. Hydrostreamer is
kept as simple as possible – intuitive with minimal data requirements –
and minimises the need for calibration. We tested the performance of
Hydrostreamer by downscaling freely available coarse-resolution global
runoff products from the Inter-Sectoral Impact Model Intercomparison Project
(ISIMIP) in an application in 3S Basin in Southeast Asia. Results are
compared to observed discharges as well as two benchmark streamflow data
products, finding comparable or improved performance. Hydrostreamer v1.0 is
open source and is available from <span class="uri">http://github.com/mkkallio/hydrostreamer/</span> (last access: 5 May 2021) under the MIT licence.</p> |
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| ISSN: | 1991-959X 1991-9603 |