| dc.description.abstract | Mountains in various regions often cause slope disaster due to terrain slope, the size and amount of soil and rock and heavy rain, etc. If the particles are eroding and entraining the soil and rock in the bottom bed at the same time as the flowing after collapse, it will cause a massive avalanche. Resulting in the human life safety hazards and the heavy property losses from residents. Therefore, the experimental model can be used to understand the phenomenon in the process of the avalanche flow in this study.
This study mainly uses experimental method to explore the effects of the different particle sizes of the granular bed (including the column bed and erodible bed) and the initial aspect ratio on the erosion and deposition behavior in the avalanche granular flow field. The experiment used an open two-dimensional inclined channel. We pulled up the baffle quickly by manual to release the particle from the column bed and measure the accumulated mass out with an electronic balance simultaneously. The experimental particle colors are distinguished by black and white, which can be analyze by image processing method. The flow field of the column bed and erodible bed, mass flow rate, residual area, runout distance, flow depth of the column bed, erosion area, final erosion area and erosion rate will be analyze and discuss in this research.
From the experimental results, it can be known that the particle size and the initial aspect ratio both have significant influence on the flow behavior of the column bed and erodible bed. When the particle size of the erodible bed is large, the accumulated mass out will be smaller and the quality of column bed will become larger. Because of the small particle enter in the gap between particles, the flow of small particle is blocked and then continued to accumulate upwards so that the flow depth of the column bed will be higher. However, when the particle size of the erodible bed is the same, the erosion area increases with the particle size of the column bed increases. In the process of changing the initial aspect ratio, the mass flow rate increases with the aspect ratio increases. Moreover, we also analyze and investigate the variety of the flow field and the flow trend of the column bed and erodible bed particles along the time and at different positions. Finally, the potential energy loss rate of the column bed has different effects on the erosion area of different erodible bed particle sizes. This is related to the different of the reason and the range for the energy loss. | en_US |