In recent years, the damage caused to human settlements in Japan by large woody debris (LWD) has been increasing. For example, the 2013 Izu Oshima typhoon resulted in a large number of fatalities and missing persons, and the Kagoshima Typhoon Disaster and Northern Kyusyu torrential downpour caused vast infrastructure damage due to the associated LWD. Current countermeasures for preventing LWD are insufficient to maintain the safety of residential areas. One type of protective barrier, the open sabo dam, has been constructed in Japan during the past 30 years. The primary function of open sabo dams is to block the flow of boulders, thereby also reducing sediment flow by reducing the gap size. However, because Japanese open sabo dams are designed specifically for boulder-trapping, the ability of these dams to trap LWD remains uncertain. In particular, many problems have been reported with respect to sediment trapping by driftwood with roots in an open sabo dam setting. The objective of this study was to examine the trapping efficiency of open sabo dams for LWD and sediment. The experimental approach clarified the influence of driftwood, without and with roots, on sediment trapping for a straight-channel flume. The flexible roots of the driftwood were shown to have a significant effect on the sediment trapping efficiency of the dam.

近年来，大型木屑（LWD）对日本人类住区造成的破坏不断增加。例如，2013年伊豆大岛（Izu Oshima）台风造成大量人员伤亡和失踪，而鹿儿岛台风灾难和九州北部的暴雨倾盆而造成的基础设施遭受重大破坏。当前防止随身携带的对策不足以维持居住区的安全。在过去的30年中，日本已经建造了一种防护屏障，即开放式sabo大坝。开放式坝坝的主要功能是阻止巨石的流动，从而通过减小缝隙大小来减少沉积物的流动。但是，由于日本的开放式sabo水坝是专为巨石捕获而设计的，因此这些水坝捕获随钻测井的能力仍然不确定。尤其是，据报道，在一个开放的萨博大坝环境中，有根的浮木捕获沉积物存在许多问题。这项研究的目的是研究裸露的sabo大坝对随钻测井和沉积物的捕集效率。实验方法阐明了无根和有根的浮木对直槽水道沉积物捕集的影响。结果表明，浮木的柔性根对大坝的沉积物捕集效率具有显着影响。