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.中国大陆及周边区域河网数据集配套数据如下：1. MERIT Hydro流向数据（merit_hydro_dir.geotiff）：该数据由全球MERIT Hydro数据集裁切得到，中国大陆及周边区域外的流向值被设为0。2. MERIT Hydro汇流面积数据（merit_hydro_upa.geotiff）：该数据由全球MERIT Hydro数据集裁切得到，中国大陆及周边区域外的数值被设为非数值（nan）。3. 河网密度数据（drainage_density.geotiff）：基于《2022年中国1km网格河网密度数据集》（https://doi.org/10.57760/sciencedb.16001），通过双线性插值得到90m分辨率的MERIT Hydro网格数据。对于研究区域外的区域，河网密度由基于汇流面积阈值10km²提取的MERIT-Hydro河网数据（river_network_10km2.gpkg）计算得到。4. 上游累积长度数据（upstream_length.geotiff）：由drainage_density.geotiff与meridi-hydro-dir.geotiff推导得到，具体计算方法可参见参考文献。5. 10km²阈值河网数据（river_network_10km2.gpkg.gz）：中国大陆及周边区域河网数据集，基于merit_hydro_dir.geotiff与merit_hydro_upa.geotiff，以10km²为汇流面积阈值提取得到。6. 适用于水动力模拟的中国大陆河网数据集（river_network_varden.gpkg.gz）：通过保河网密度的河网提取算法得到，输入数据为merit_hydro_dir.geotiff、merit_hydro_upa.geotiff与upstream_length.geotiff，汇流面积阈值为0.5km²，河段长度阈值为0.5km，提取算法详见参考文献。7. 1km河段长度10km²阈值河网数据（river_nework_10km2_1km.gpkg.gz）：与river_network_10km2.gpkg.gz内容一致，仅所有河段长度约为1km，适用于水动力模拟。8. 1km河段长度保密度河网数据集（river_network_varden_1km.gpkg.gz）：与river_network_varden.gpkg.gz内容一致，仅所有河段长度约为1km，适用于水动力模拟。