Proposal for prevention strategies against the enlarged turbidity currents

针对全球气候变暖导致局部山区强降水异常集中而带来的严重灾害，提出了控制浊流的实用方法和保护人类财产的策略。 我们进行了实验，使用一个小的倾斜槽和计算的基础上的有限体积解的Navier-Stokes方程的这种扩大的浊流。 结果表明，水流与障碍物的相互作用，将质量和能量较大的强水头分为上下两部分，必然降低了水流后半部分向水头的供能率。 结果发现，即使是远离底部的水平平板结构系统也具有相当大的效果，可以在不对环境造成任何负担的情况下降低破坏性冲击力。

This study proposes the practical methods of controlling the turbidity currents and the strategies to protect human properties in the serious disasters which have been more frequently brought about by heavy precipitation extraordinarily concentrated in some local mountainous areas due to global warming. We carried out the experiments using a small inclined tank and the computations based on the finite volume solution of the Navier-Stokes equations for such enlarged turbidity currents. The results indicate that the interaction of the currents with the obstacles certainly reduces the rate of energy supply to the head from the latter part of the current by dividing the powerful head with a large amount of the mass and energy into the upper and lower parts. It is found that as a result even the system of horizontal flat structures away from the bottom has considerable effects to depress the destructive impact force without any burden on the environment.