Research on the Control of Debris Flows

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A new method for establishing a design debris flow with which the counter measures should cope is presented. This method assesses the magnitude and characteristics of the possible debris flows in an objective basin which may be arised by some devere rainfall enents by simulating process of generation and development of those debris flows.The constitutive equations in the debris flows are clarified by considering the relationship between the solids concentration and the particle contact stresses, thereby the more reliable motion formulae for stony and hybrid type debris flows are obtained. Behavior and their effects on the flow of the woody debris in a stony debris flow are experimentally discussed.Degradation of the river bed upstream of a sabo dam after a debris flow event is essential to regulate the next debris flow. In this investigation, the actual fluvial processes in a mountain torrent are discussed by using long years' observation data. Furthermore, a computer simulation method for tracing the processes of channel bifurcations and bed erosions on a torrent bed which contains very big boulders transported by debris flows is given.If the amount of sediment runoff from a basin is very large, the sand pocket is often constructed to store those sediments. The function of that facility is hydraulically discussed and experimentally checket to obtain the appropriate design method.