1 引言天龙川水系与田切河是以中央阿尔卑斯山东坡为集水区域的山溪。特别是在以面积达20hm~2的源头的支流奥堡伦谷溪中屡屡发生泥砂流动和泥石流。该流域计划修筑7座防砂坝,但由于将来所施工的饭岛第6号防砂坝位于来自奥堡伦谷溪泥石流通过地点,所以为保证施工安全而设置了新型泥石流防治设施——钢制格式墩柱坝群。虽然奥堡伦谷溪于1993年8月14~ 1 Introduction The Tianlongchuan water system and the Tianhe River are mountain streams that catch water on the east slope of the Central Alps. Especially in the area of ​​20hm ~ 2 the source of the tributary of the Okinawa Valley Creek sand and mud flow occurred repeatedly. The dam plans to build seven sand control dams, but due to the future construction of the Iijima dredging sandstorm No. 6 located in the debris flow from Locarno Valley, Fort Oh Valley, so in order to ensure the safety of the construction of a new debris flow prevention and control facilities - steel format Pier and dam group. Although the Fort of Oakland Valley Creek in August 1993 ~ 14 ~