A Chinese Mainland River Network Dataset For Hydrodynamic Simulations

River network data in Chinese Mainland and surrounding regions include the following supporting data: 1. merit_hydro_dir.geotiff: MERIT Hydro flow direction data. The data is chopped from MERIT Hydro global data, and the flow direction outside Chinese Mainland and surrounding areas is set to 0. 2. merit_hydro_upa.geotiff: MERIT Hydro drainage area data. This data is chopped from MERIT Hydro global data, and the flow direction outside Chinese Mainland and surrounding areas is set to nan. 3 drainage_density.geotiff: Drainage density data. Bilinearly interpolated from the "a dataset of 1km grid drainage density in China 2022" (https://doi.org/10.57760/sciencedb.16001) to a 90 meter MERIT Hydro grid. For regions outside the study domain, the drainage density is calculated from a river network delineated from MERIT-Hydro data with a drainage area threshold of 10 km2(river_network_10km2.gpkg). 4 upstream_length.geotiff: Upstream accumulation length. Derived from drainage_density.geotiff and meridi-hydro-dir.geotiff, the calculation method can be found in the reference. 5 river_network_10km2.gpkg.gz: River network data of Chinese Mainland and surrounding regions. This data is extracted using a 10 km2 threshold based on merit_hydro_dir.geotiff and merit_hydro_upa.geotiff.6 river_network_varden.gpkg.gz: A Chinese Mainland River Network Dataset For Hydrodynamic Simulations. This data was extracted using a drainage density-preserving river network delineation algorithm. The input data are merit_hydro_dir.geotiff, merit_hydro_upa.geotiff and upstream_length.geotiff, with a threshold of 0.5 km2 for drainage area and 0.5 km for river segment length. Please refer to the reference for the delineation algorithm. 7 river_nework_10km2_1km.gpkg.gz: the same as river_network_10km2.gpkg.gz, except that all the river segments have length of approximately 1 km. The dataset is suitable for hydrodynamic simulations.8 river_network_varden_1km.gpkg.gz: the same as river_network_varden.gpkg.gz, except that all the river segments have length of approximately 1 km. The dataset is suitable for hydrodynamic simulations.