Abstract
Cylindrical holes, so-called the pothole, are often found on the exposed bedrock in riverbed and riverbank. The formation process of pothole gives us a suggestion for considering an abrasion of concrete hydraulic structures. A sand by-passing tunnel as a measure against sedimentation in dam reservoir suffers the damage of abrasion caused by colliding cobbles. This paper intends to show the framework for evaluation of abrasion induced by colliding cobbles, through the simulation of pothole formation. The MPS method, which has a good performance in the simulation of rapidly varied flow with fragmentation and coalescence of water, is extended by adding the moving solid module as a model of a cobble. The motion of cobble driven by the stream in a pothole is tracked to evaluate the collision impact of cobble to the wall of pothole.
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