Research on the Control of Debris Flows

本文提出了一种新的泥石流防治措施设计值的确定方法。该方法通过模拟泥石流的产生和发展过程，对目标流域内可能发生的泥石流的规模和特征进行评价，并考虑泥石流中固体颗粒浓度与颗粒接触应力之间的关系，建立了泥石流的本构方程。从而得到了较为可靠的石质型和混合型泥石流运动公式。本文通过实验研究了木质残体在石质泥石流中的运动特性及其对泥石流的影响。泥石流发生后，沙博坝上游河床的退化对下一次泥石流的控制至关重要。本文利用多年的观测资料，讨论了山洪的实际演变过程。此外，本文还提出了一种计算机模拟方法，用于追踪含有泥石流搬运的大漂石的急流河床上的河道分叉和河床冲刷过程。如果流域内的径流泥沙量很大，则往往建造沙袋来储存这些泥沙。对该装置功能进行了水力学讨论和实验检验，以获得适当的设计方法。

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.