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Many houses were broken and washed out by the supercritical tsunami flow overflowed from river embankment. Under the supercritical flow, drag force characteristics of dense obstacles and bed shear stress around them have not been clarified. Therefore, the objective of this study is to find out the effect of spacing of neighboring obstacles on the drag characteristics of quadratic prisms (house model) and bed shear stress distribution around them. Drag force acting on the house model and bed shear stress were measured by force gauge and shearing strain sensor, respectively. Four cases for different overflow depth and three cases for different G/bh (where, G and bh is horizontal spacing of each house model and width of a house model, respectively) were conducted. Drag force acting on the house model and bed shear stress between two house models (τm) increased with narrowing G. When G/bh=0.4, drag force and τm became 1.6 and 1.4 times comparing with single house model, respectively. However, when G/bh=1.2, drag force and shear stress became almost the same with single house case.

DRAG FORCE ACTING ON A QUADRATIC PRISM AND BED SHEAR STRESS AROUND IT IN SUPERCRITICAL FLOW