Effect of sediment transport on the temporal and spatial characteristics of flash floods: A case study of “7.21” flood in Beijing

SONG Yuntian; ZENG Xin; ZHANG Yu; AN Chenge; MA Meihong; FU Xudong

doi:10.16511/j.cnki.qhdxxb.2019.26.023

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (12) : 990-998. DOI: 10.16511/j.cnki.qhdxxb.2019.26.023

HYDRAULIC ENGINEERING

Effect of sediment transport on the temporal and spatial characteristics of flash floods: A case study of “7.21” flood in Beijing

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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.

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flash flood / sediment transport / maximum water level / maximum flow rate / peak flow time

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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[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(12): 990-998 https://doi.org/10.16511/j.cnki.qhdxxb.2019.26.023

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