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TURBULENT STRUCTURE IN OPEN CHANNEL WITH LONGITUDINALLY CONTINUOUS SIDE CAVITIES

The cavity zone along riverside is expected to produce native habitats of various ecosystems and water-friendly environment. However, there is also a problem such as concern about deterioration of water quality because of a dead watet area. In this research, we have clarified the flow structure when the cavity aspect ratio changes for a flow field in which side cavity are continuously arranged in the downward flow direction. The flow velocity were measured by using PIV. As a result, it was clarified that the influence of the side cavity extended around the sidewall on the opposite bank side because of the flowing direction length of the cavity long in this experiment case. Furthermore, we also clarified how the turbulence generation term and the direct heat dissipa-tion term change in the turbulent energy balance formula when changing the aspect ratio of the side cavity.