LI Bingzhi,PAN Huali,DENG Qijuan,et al.Experimental Study on Variation Characteristics of Debris Flow Movement Parameters under Movable Bed Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):850-858.
LI Bingzhi,PAN Huali,DENG Qijuan,et al.Experimental Study on Variation Characteristics of Debris Flow Movement Parameters under Movable Bed Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):850-858. DOI: 10.13409/j.cnki.jdpme.20210206001.
Experimental Study on Variation Characteristics of Debris Flow Movement Parameters under Movable Bed Conditions
The change characteristics of debris flow movement parameters are closely related to the discharge of debris flow, the longitudinal slope and the source composition of the gully bed. Accurate determination of the change characteristics of debris flow movement parameters is of great significance for assessing watershed risks and designing prevention engineering. Through the indoor flume experiments, the changes in flow depth, velocity and bulk density of debris flow at the observation point of the trench under the conditions of different flow rates, longitudinal slopes of the gully bed, and fine particle contents of the source composition were explored. The research results show that when the inflow rate and the longitudinal slope of the gully bed are greater, and the fine particle contents of the source composition are smaller, the scouring ability of debris flow is stronger; under the same experimental conditions, the fluid flow depth is positively correlated with the inflow rate. There is a negative correlation between the fluid flow depth and the fine particle contents. The flow depth is more deeply affected by the influx than the fine particle content; the fluid velocity is positively correlated with the influx and the longitudinal slope of the gully bed and is negatively correlated with the fine particle contents. The longitudinal slope of the bed has the greatest influence on the flow, and the flow is the least affected by fine particle contents; the fluid bulk density is negatively correlated with the influx and the fine particle contents, and positively correlated with the longitudinal slope of the gully bed. The impact of particle content on the bulk density of the debris flow is greater than that of the influx. The data of the flow rate of the debris flow was fitted through the experiment of the sink, and the peak flow of the Guoquanyangou “7.26” debris flow in 2013 was calculated using the flow fitting formula. Compared with the measured results, the fitting degree of the calculation data was found to be higher than 80%.
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