토사재해 발생시 인적피해를 유발하는 한계수심 및 한계유속에 관한 연구

In this study, we suggest that the methodology which can estimate the critical depth and critical velocity based on the results of the previous experimentation with focusing on damage of human side. The case of human instability means that the human is swallowed by mud flows. We modified the drag force of mud flow for considering the difference of drag force by the fluid density. The velocity reduction factor is applied to estimate the drag force on mud flow. As a result, the mud flow was found that the critical velocity on mud flow is estimated smaller, compared with the flooding due to the density of mud flow. It means the risk of casualties on mud flow is higher than the flooding. In addition, it was found that the elderly and children are more vulnerable to mud flow, and children were ones in most danger.