Abstract：Taking the "7.21" flash flood in Hongluogu valley as study object, the effect of sediment transport on flash flood characteristics is investigated by comparing the results of moving-bed model, fixed-bed model and post-disaster survey data. Due to the interaction between sediment and flow, maximum water level under the moving-bed condition is generally higher than that of fixed-bed condition yet maximum flow rate decreases. The possibility of getting flooded in some sections increases and the flooded time of the depositional section extends. Affected by erosion and deposition, the arrival time of maximum water level at partial sections is different from the arrival time of flood peak, which indicates the insufficiency in judging flooding trend throughout the channel by observations from limited monitoring points. These results would play a guiding role in risk analysis and disaster prevention of flash floods.
宋云天, 曾鑫, 张禹, 安晨歌, 马美红, 傅旭东. 泥沙输移对山洪特征值时空分布的影响——以北京“7.21”山洪为例[J]. 清华大学学报（自然科学版）, 2019, 59(12): 990-998.
SONG Yuntian, ZENG Xin, ZHANG Yu, AN Chenge, MA Meihong, FU Xudong. Effect of sediment transport on the temporal and spatial characteristics of flash floods: A case study of “7.21” flood in Beijing. Journal of Tsinghua University(Science and Technology), 2019, 59(12): 990-998.
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2019, Vol. 59 
