Author(s): Shinji Kioka; Yoshikatsu Yasunaga; Yuko Matsuo; Atsushi Kubouchi; Hiroshi Saeki
Linked Author(s):
Keywords: No Keywords
Abstract: In addition to our previous experiments on ice-scour event including the medium-scale model test (Kioka et al., 2000,2001a, b), we have performed many series of model tests under various conditions. We examined the main factors for scour-processes, and obtained many results needed for a future work (numerical simulation of scour events) as described later. In all cases, the scour depth or the scour curve depended on the attack angle. As the attack angle decreased, the model keel moved upward due to the slip between the seabed and the model keel. While we showed that the bulldozing force related to the excess pore water pressure, and it was proportional to the square of velocity of the keel and to the inverse of the coefficient of permeability from a simple model, we also proved this relationship by the experimental results. In order to conduct a small-scale model test, these results showed that the grain size of sand of seabed and the velocity of the keel should be controlled. We then examined its scale-effect.
Year: 2002