Author(s): Chaoxu Shi; Xiaoxiang Zhang; Kejian Zhang; Ying Wang; Haowen Wang; Qiang Ma
Linked Author(s): Ying Wang
Keywords: Flash flood flood propagation mountainous catchment distributed model
Abstract: July 2024, caused by an extreme rainfall event, a highway bridge at mountainous area of Shaanxi province, China was collapsed by flash flood disaster. In order to deeply understanding the main causes and the flood process of this event, a distributed modelling approach has been presented for representing the flood peak propagation from upstream to the downstream of the catchment. Based on the observation data collected from 5 gauging stations and the measured water level from 10 cross section at the mouth of the tributaries, the SKY-HydroSAT model applied in this study shows higher preference with averaged flood peak error less than 2% and the maximum difference between observed and simulated water level less than 0.2m. The main flood was estimated coming from the Hongyansi sub-basin located at the North part of the catchment with rainfall-runoff coefficient around 0.8. The flood peak at the collapsed bridge is consisted with the flow peak from two branches arrived at same time which enlarged the disaster damage. The modelling approach integrated with field survey of water level collection at different cross section could widely promoted in the flood disaster investigation in other area of China.
Year: 2025