This study aims to record the process of mudstone slope erosion during high intensity rainfall events using an artificial rain simulator and Terrestrial LiDAR. Further, we connect the erosion pattern and accumulated rainfall. Field Experiments are carried out in Longqi, Tainan.
The results show the water erosion process of mudstone regolith can be divided into four stages. (1): The main
erosion pattern is recognized as sheet erosion, because it has a large erosion range but low erosion volume; (2): When the erosion volume and rate increase rapidly, the erosion process enters the rill erosion stage; (3): As rill develops, the surface flow merges into a single water flow path, and the effect of the inter-rill erosion decreases. At the same time, the number and scale of the collapse also decline; (4): While the mud-cracks almost disappear, the erosion pattern enters the stable stage. At that time, the single rill becomes wider and deeper. In this stage, the main erosion process can be thought of rill erosion and collapse which occur occasionally.
Key Words : Mudstone regolith, water erosion, artificial rain simulator, terrestrial LiDAR, rill.