Author(s): Mikio Hino; Yang Meng; Nobuyoshi Murayama
Linked Author(s): Mikio Hino
Keywords: No Keywords
Abstract: Understanding of the actions of turbulence in flood flows is important for the design of hydraulic tructures to reduce flood disasters. Turbulence enhances the suspension of bed material loads, scores of river beds, and exerts high shear stresses on curved banks and levees by the violent luctuating forces on hydraulic structures. Flow velocities in flood periods of a middle sized river, Hinumagawa, have been easured simultaneous by electromagnetic velocimeters at nearby eight points on a plane erpendicular to a stream. The velocity data simultaneously obtained are analyzed to draw the three-dimensional nstantaneous image of strong turbulence. The 'virtual-load method' was applied to inter-and xtrapolated the obtained data, and the MASCON (mass-consistent) method to improve the stimated data by the requirement of the least-square-errors. The results confirmed the existence of a coherent or organized structure which gives rise o strong turbulence.
Year: 1993