Research on the Control of Debris Flows

提出了一种建立设计泥石流的新方法，并提出了应对措施。该方法通过模拟泥石流的发生和发展过程来评估目标流域可能发生的泥石流的大小和特征，通过考虑颗粒浓度和颗粒接触应力之间的关系来阐明泥石流中的本构方程，从而得到更可靠的石质和混合型泥石流的运动公式。对石质泥石流中木质泥石流的行为及其对泥石流的影响进行了实验研究。泥石流发生后，沙波坝上游河床的淤积对下一次泥石流的调控至关重要。本文利用多年的观测资料，讨论了一次山洪暴发过程中的实际河流过程。此外，还给出了一种计算机模拟方法，用于跟踪含有泥石流输送的巨石的激流河床上的河道分叉和河床侵蚀过程。对该装置的功能进行了水力学讨论和试验验证，以获得合适的设计方法。

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.