The frequency of torrential rain, heat wave, and heavy snow is increasing due to climate change caused by global warming. This leads to an increase in the occurrence of natural disasters. The frequency of debris flow, a type of natural disaster, is also increasing in Korea. Debris flow is a type of ...
The frequency of torrential rain, heat wave, and heavy snow is increasing due to climate change caused by global warming. This leads to an increase in the occurrence of natural disasters. The frequency of debris flow, a type of natural disaster, is also increasing in Korea. Debris flow is a type of mass movements and distinct from landslides, and consists of various particles from clay to boulder. Debris flow accounts for most of the recent forest soil sediment disasters in Korea, and it’s occurring not only in mountainous areas but also in urban areas. Therefore, studies on risk analysis and countermeasure design to reduce debris flow damage should be conducted. For this, it is necessary to calculate the runout distance, impact force, and potential amount of debris flow. The flume experiment is a suitable method to determine the behavior characteristics of debris flow under limited conditions. In this study, the behavior characteristics of debris flow were analyzed according to channel slope, volumetric sediment concentration, and berm installation through flume experiment. In addition, flow resistance coefficient and Froude number were calculated using the measured flow depth and flow velocity. As the channel slope increased, the runout distance and flow velocity increased but the flow depth decreased except some cases. In addition, as the volumetric sediment concentration increased, the runout distance, flow velocity, and flow depth decreased. When the berm was installed, the runout distance, flow velocity, and flow depth decreased. The flow resistance coefficients μ, ξ, n, C1 and C2 were estimated, and it was confirmed that coefficients except C2 were affected by volumetric sediment concentration. In addition, the average values of μ, ξ, n, C1, C2 were 0.089Pa․s, 9152.3m-0.5s-1, 0.012m-1/3s, 32.027m0.5s-1, 8.005m0.78s-1. The range of Froude numbers obtained in this study was 4.14-10.79. The flow resistance coefficients estimated in this study can be used as basic data for the design of debris flow countermeasure structures.
The frequency of torrential rain, heat wave, and heavy snow is increasing due to climate change caused by global warming. This leads to an increase in the occurrence of natural disasters. The frequency of debris flow, a type of natural disaster, is also increasing in Korea. Debris flow is a type of mass movements and distinct from landslides, and consists of various particles from clay to boulder. Debris flow accounts for most of the recent forest soil sediment disasters in Korea, and it’s occurring not only in mountainous areas but also in urban areas. Therefore, studies on risk analysis and countermeasure design to reduce debris flow damage should be conducted. For this, it is necessary to calculate the runout distance, impact force, and potential amount of debris flow. The flume experiment is a suitable method to determine the behavior characteristics of debris flow under limited conditions. In this study, the behavior characteristics of debris flow were analyzed according to channel slope, volumetric sediment concentration, and berm installation through flume experiment. In addition, flow resistance coefficient and Froude number were calculated using the measured flow depth and flow velocity. As the channel slope increased, the runout distance and flow velocity increased but the flow depth decreased except some cases. In addition, as the volumetric sediment concentration increased, the runout distance, flow velocity, and flow depth decreased. When the berm was installed, the runout distance, flow velocity, and flow depth decreased. The flow resistance coefficients μ, ξ, n, C1 and C2 were estimated, and it was confirmed that coefficients except C2 were affected by volumetric sediment concentration. In addition, the average values of μ, ξ, n, C1, C2 were 0.089Pa․s, 9152.3m-0.5s-1, 0.012m-1/3s, 32.027m0.5s-1, 8.005m0.78s-1. The range of Froude numbers obtained in this study was 4.14-10.79. The flow resistance coefficients estimated in this study can be used as basic data for the design of debris flow countermeasure structures.
주제어
#토석류, 수로실험, 거동 특성, 흐름 저항계수, Froude 수
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