Author(s): Xiaohan Ju; Xiaoxiang Zhang; Kejian Zhang; Ying Wang; Chaoxu Shi; Qiang Ma
Linked Author(s): Ying Wang, Qiang Ma
Keywords: Mechanism analysis flash flood distributed hydrological model Lijiang river
Abstract: With the climate changes and human activities, the frequency of extreme rainfall events shows an obvious increasing trend in recent years. When the extreme rainfall landed on the mountainous area, due to steep slope and the typical land use types of those areas, the flash flood characterized with high flow velocity and short duration often leads to a serious flood disaster. In order to deeply understand the mechanism of the flash flood disaster and to support the decision-making process for the future flood defense, a distributed hydrological modelling approach has been presented in this study with the “6·19” flood disaster happened in Lijiang river basin (13000km2), Guangxi, China. The modelling assessment is able to represent the flood process with NSE of Guilin station equals to 0.694and to deeply indicate the flood generation mechanism during the event. The main sources of the Guilin flood which causes serious economic damages comes from the part of the catchmen above the Fuzikou Reservoir with maximum cumulative rainfall of 838mm and rainfall-runoff coefficient over 0.81. The modelling approach presented in this study shows high applicability which could be promoted to other catchment with similar underlayer conditions.
Year: 2025