Journal of the Japan Society of Erosion Control Engineering, Vol.58,No.4,2005
Experiments on sediment trap reliability of hybrid buttress dams with lateral
beams
Toru NAKAMURA Yuji HASEGAWA Akira ODA
Abstract
Since the slit sabo dams of clog type have been developed mainly using steel slits
of vertical or lattice type, the effectiveness of the slit sabo dams using steel
pipes installed in the lateral direction (lateral beams) for catching sediment
in debris flow has not been examined much. Therefore, we experimentally examined
how effectively a hybrid buttress type sabo dam using both vertical pillars (vertical
slit) and lateral beams can catch mass]transport of sediment in debris flow, and
further, how effectively another hybrid buttress sabo dam where subsidiary vertical
materials are installed between the vertical slits can catch sparse]transport
of sediment in traction.
The results are summarized as follows: if the lateral beams of the hybrid buttress
dam are installed at intervals of 1.0~d95, the same effect on catching sediment
can be obtained as in the case where the intervals of vertical pillars are set
to 1.5~d95. Moreover, it proves that, aside from the strength of the materials,
even subsidiary vertical materials which are as slender as wire can catch sediment
effectively if their installation intervals are narrow. This suggests that if
it is necessary to install the vertical materials at narrow intervals, the use
of a slender material like wire can be effective in securing the opening rate
of the sabo dam.installations.
Key words:hybrid buttress sabo dam, lateral beams, subsidiary vertical materials,
debris flow, traction
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