Abstract
Grid type dam to catch debris flow consists of vertical bars and horizontal bars. But it is often that it is installed at a slope that debris flow flows and stops. Sediment in such an area may take form of sediment flow. Therefore it is important to check the ability of sediment trap on a gentle slope. And so we prepared vertical members and horizontal members and aimed for estimating their ability by flume experiments and considering about influence by the difference of running sand form and the following flow. As a result of experiments, we ascertained that vertical bars were principal part and horizontal bars were subsidiary part about sediment trap. Because a rate of sediment which were carried by the following flow decrease. On the other hand, we ascertained running sand may take form sediment flow on a gentle slope and coarse sediment may not flow in the front, too. Therefore when installing steel pipe sabo-dam on a gentle slope, it is important to understand position of steel pipes and measures against debris flow in an area more downward than dam.
