Preprints
https://doi.org/10.5194/essd-2021-434
https://doi.org/10.5194/essd-2021-434

  07 Dec 2021

07 Dec 2021

Review status: this preprint is currently under review for the journal ESSD.

River network and hydro-geomorphology parametrization for global river routing modelling at 1/12° resolution

Simon Munier and Bertrand Decharme Simon Munier and Bertrand Decharme
  • CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France

Abstract. Global scale river routing models (RRMs) are commonly used in a variety of studies, including studies on the impact of climate change on extreme flows (floods and droughts), water resources monitoring or large scale flood forecasting. Over the last two decades, the increasing number of observational datasets, mainly from satellite missions, and the increasing computing capacities, have allowed better performances of RRMs, namely by increasing their spatial resolution. The spatial resolution of a RRM corresponds to the spatial resolution of its river network, which provides flow direction of all grid cells. River networks may be derived at various spatial resolution by upscaling high resolution hydrography data. This paper presents a new global scale river network at 1/12° derived from the MERIT-Hydro dataset. The river network is generated automatically using an adaptation of the Hierarchical Dominant River Tracing (DRT) algorithm, and its quality is assessed over the 70 largest basins of the world. Although this new river network may be used for a variety of hydrology-related studies, it is here provided with a set of hydro-geomorphological parameters at the same spatial resolution. These parameters are derived during the generation of the river network and are based on the same high resolution dataset, so that the consistency between the river network and the parameters is ensured. The set of parameters includes a description of river stretches (length, slope, width, roughness, bankfull depth), floodplains (roughness, sub-grid topography) and aquifers (transmissivity, porosity, sub-grid topography). The new river network and parameters are assessed by comparing the performances of two global scale simulations with the CTRIP model, one with the current spatial resolution (1/2°) and the other with the new spatial resolution (1/12°). It is shown that CTRIP at 1/12° overall outperforms CTRIP at 1/2°, demonstrating the added value of the spatial resolution increase. The new river network and the consistent hydro-geomorphology parameters may be useful for the scientific community, especially for hydrology and hydro-geology modelling, water resources monitoring or climate studies.

Simon Munier and Bertrand Decharme

Status: open (until 01 Feb 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-434', Anonymous Referee #1, 15 Dec 2021 reply
    • AC1: 'Reply on RC1', Simon Munier, 17 Dec 2021 reply
  • RC2: 'Comment on essd-2021-434', Dai Yamazaki, 11 Jan 2022 reply

Simon Munier and Bertrand Decharme

Data sets

River network and hydro-geomorphology parametrization for global river routing modelling at 1/12° resolution (1.0.0) Munier Simon, & Decharme Bertrand https://doi.org/10.5281/zenodo.4009304

Simon Munier and Bertrand Decharme

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Short summary
This paper presents a new global scale river network at 1/12°, generated automatically and assessed over the 70 largest basins of the world. A set of hydro-geomorphological parameters are derived at the same spatial resolution, including a description of river stretches (length, slope, width, roughness, bankfull depth), floodplains (roughness, sub-grid topography) and aquifers (transmissivity, porosity, sub-grid topography). The dataset may be useful for hydrology modelling or climate studies.