DOMINANT BEHAVIOR OF FREE SURFACE IN RIVER FLOW

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  • 実河川における自由水面の支配的挙動

Abstract

<p> In an open channel turbulent flow, such as a river flow, its free surface deforms dynamically and shows various behavior depending on hydraulic conditions. It is known that free surface in a river flow behaves as gravity waves and coincidently shows a turbulence-like feature. However, it is not fully understood that how the dominant behavior of free surface in a river flow changes depending on flow conditions. In this study, time-depending profiles of free surface in river flows were reconstracted from imagery shot from a riverbank and Fourier spectral analyses were performed using that data. As the results, it was made clear that the free-surface behvaior in a river flow consists of superpositions of gravity waves and flow, also of stationary waves that are the results of the interacion between the flow and waves. Additionally, the contribution ratio of the flow to free-surface fluctuation are found to decrese in proportion to wave length of the stationary waves or squares of the Froude number.</p>

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