Author(s): Tiejian Li; Jiaye Li; Zhaoxiang Jiang; Li Zhang; Yu Fu

Linked Author(s): Guangqian Wang

Keywords: Digital elevation model; Drainage network; Hydro3

Abstract: The topology and geometry of drainage networks with high resolution and precision is essential to geomorphological research, water resource management and hydrological simulations. This study proposes a refined dataset of drainage networks from up-to-date 30-meter resolution DEMs. Following a previous Hydro30 dataset, we name this refined one as Hydro30 V2, develop it for higher precision in planar shapes and geometry parameters, with a reach-by-reach codification system and a Horton-Strahler order-based hierarchical data pyramid, aiming at the global scale. We first comprehensively compared the global 30-meter DEM data from different sources, and selected the latest and most appropriate DEM as the data source for drainage network extraction. Then, we produce the Hydro30 V2 by using a high-efficient drainage network extraction software developed by our team, which is based on the D8 method and least-cost search algorithm, and integrates improvements including depression breaching, channel head identification and known river data strengthening. Finally, after coding each river reach with a binary-tree based method and building a data pyramid, the Tsinghua Hydro30 V2 are being continuously produced to cover the whole globe, while provided for free access.

DOI: https://doi.org/10.3850/iahr-hic2483430201-392

Year: 2024