River network and hydro-geomorphological parameters at 1∕12° resolution for global hydrological and climate studies

Abstract. Global-scale river routing models (RRMs) are commonly used in a variety of studies, including studies on the impact climate change extreme flows (floods and droughts), water resources monitoring or large-scale flood forecasting. Over last two decades, increasing number observational datasets, mainly from satellite missions, computing capacities have allowed better performance by RRMs, namely their spatial resolution. The resolution RRM corresponds to its network, which provides flow directions all grid cells. River networks may be derived at various resolutions upscaling high-resolution hydrography data. This paper presents new global-scale network 1/12∘ MERIT-Hydro dataset. is generated automatically using an adaptation hierarchical dominant tracing (DRT) algorithm, quality assessed over 70 largest basins world. Although this for hydrology-related it provided here with set hydro-geomorphological parameters same These during generation based dataset, so that consistency between ensured. includes description stretches (length, slope, width, roughness, bankfull depth), floodplains (roughness, sub-grid topography) aquifers (transmissivity, porosity, topography). comparing performances simulations CTRIP model, one current (1/2∘) other (1/12∘). It shown that, overall, outperforms 1/2∘, demonstrating added value increase. consistent hydro-geomorphology parameters, freely available download Zenodo (https://doi.org/10.5281/zenodo.6482906, Munier Decharme, 2022), useful scientific community, especially hydrology hydro-geology modelling, studies.