Author(s): Fangrui Dong; Tao Sun; Xiaoxiang Zhang; Bang Yang; Qiang Ma
Linked Author(s): Qiang Ma
Keywords: Basin flood management “23·7” catastrophic flood distributed hydrological model Ziya river basin
Abstract: The development of hydroinformatics technologies is able to support the decision-makers to have more scientific and accurate measures to defence the catastrophic flood disaster on catchment scale. Taking the “23·7” catastrophic flood occurred in Ziya river basin (47,000 km2) in 2024, a modelling-based assessment approach has been presented to understand the flood characteristics and to evaluate the implementation of certain measures. With more than 12.6 billion m3 rainfall landed in 7 days, the decision-makers for managing the flood in Ziya river basin faced large pressure and have to find an operational measure to defence the flood. By using the big reservoirs located at upper and middle parts of the catchment, the flood amount enter to the Xianxian detention area had been reduced 68%. Based on a distributed hydrological model calibrated with averaged NSE value higher than 0.7, the flood progress has been represented by the numerical tool and the effects of the big reservoirs has been also evaluated. The different ratio of the Xianxian flooded area with and without the reservoirs impacts is more than 70%. The modelling-based approach presented in this study shows high applicability to be promoted to any other large catchment with complicated flood characteristics and hydraulic structures.
Year: 2025