Geomorphometry-based modelling of discharge series in ungauged basins – Robustness regarding DEM sources
2020
Abstract. The sensitivity of a geomorphology-based hydrological modelling is
evaluated according to four DEMs from 5 to 50 m resolution in Brittany,
France. A set of 8 basins (5–565.7 km 2 ) is used in a
pseudo-ungauged context to explore the potential of Prediction in Ungauged
Basin (PUB). The results show that despite slight differences on the stream
networks extracted from DEMs and associated transfer functions, a
coarse-worldwide DEM such as SRTM (25 m) supported similar performances than
the finer French DEM (5 m) based on three validation indices. Finer DEMs may
be useful only on headwater basins to gain a marginal performance.
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