Sediment Trap Function of Open-type Steel Sabo Dam with respect to Shape and Installation Slope

streams. Horiuchi et al.(2009 a), (2009 b) focused on the effect of the open-type steel sabo dam on sediment concentration, specifically In this study, we consider the debris flow trap function of the open-type steel sabo dam using channel experiments. Various studies have been conducted on the sediment trap function of open-type sabo dams due to boulder blocking in steep-slope areas, considered as areas with a slope of 15 ° or greater. However, many open-type sabo dams have been built in moderate-slope areas, which have a slope less than 15 ° . Few studies have been conducted on open-type sabo dams built in mild-slope areas. Therefore, we consider the trap function of the open-type sabo dams in areas having slopes of 12, 9, and 6 ° . In addition, we consider different shapes of the open-type steel sabo dam : grid-type, vertical-type, and horizontal-type. The results show that the trap functions were effective for all slope cases and for all types of dams. Steeper slopes resulted in higher trap functions. The grid-type and vertical-type dams trapped particles more effectively, with higher trap functions than the horizontal-type dams, and large differences appeared in cases where the slope was 6 ° .