Author(s): Fangrui Dong; Tao Sun; Xia Zhang; Pan Zhang; Xiangcai Tian; Yalu Su; Qiang Ma
Linked Author(s):
Keywords: Digital twin watershed; Distributed Hydrological Model; Hydraulic Simulation
Abstract: Affected by the global climate change, flood management faces growing challenges. However, digital twin watershed is found effectively to improve its flood control capacity. This study applied IWHR's distributed hydrological model (Hydro-SAT) to analysis of flood mechanism in Huangshui River Basin. Summer precipitation and runoff data from 2015 to 2019 have been chosen, and Huangshui River Basin has been separated into 40 models (13 with observation data). Results indicate that the errors in flood peak discharge during this periods were all within 10%, and the errors in flood peak occurrence time were all within 3 hours, meeting the requirements of mountain flood forecasting. The main conclusions are as follows: The main rainstorm areas in the Huangshui River Basin are concentrated in the upstream north branch, but the main runoff-generating areas are in the south branch (controlled by the Huangyuan and Xinachuan stations). The upstream exhibits a mixed Horton–Dunne runoff mechanism, with an average annual runoff coefficient of 0.27. The proposed modelling strategy in this study is clear and operational for guiding the implement of digital twin watershed in other places and the models set up following the strategy shows high performance and efficiency.
Year: 2026