Author(s): Ying Wang; Zhaoxu Shi; Yongcheng Yang; Qiang Ma; Hui Fan; Xiaoxiang Zhang

Linked Author(s): Ying Wang, Qiang Ma

Keywords: "23·7" catastrophic flood; Daqing River Basin; Distributed hydrological model; Flood mechanism

Abstract: To clearly understand the mechanism of flood disaster at the mountainous area, a deterministic distributed hydrological model which could be able to separately represent the flood components such as surface flow, soil flow and base flow is currently requested by the local stakeholders. In this study, a distributed hydrological model (Hydro-SAT) development by IWHR has been applied in the modelling analysis of “23•7” catastrophic flood in Daqing River Basin. Calibrated with the data obtained from the gauging stations in different branches of Daqing River Basin, the simulation results show higher performance with average relative errors of 4.5% difference of peak flow and average NSE equals to 0.7. The main flood generation area in Daqing River Basin is located at the mountainous area in the northern part of the catchment with average rainfall-runoff coefficient around 0.7. The fast flood flow produced by the mountainous area of the river basin can be concluded as one of the main causes of this flood disaster characterized with relatively higher flood peak and normal flood amount. The study validates Hydro-SAT's suitability for flood disaster mechanism analysis and suggests its potential application in similar basin contexts.

DOI: https://doi.org/10.3850/iahr-hic2483430201-260

Year: 2024