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Experimental study of the woody debris trapping efficiency of a steel pipe,open sabo dam

International Journal of Sediment Research 2020年第5期35卷 431-443页

作者： Ryuhei Tateishi Toshiyuki Horiguchi Yoshimi Sonoda Nobutaka Ishikawa Department of Civil and Structural Engineering Kyusyu University Department of Civil Engineering National Defense Academy National Defense Academy

In recent years,the damage caused to human settlements in Japan by large woody debris(LWD) has been *** 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 *** countermeasures for preventing LWD are insufficient to maintain the safety of residential *** type of protective barrier,the open sabo dam,has been constructed in Japan during the past 30 *** primary function of open sabo dams is to block the flow of boulders,thereby also reducing sediment flow by reducing the gap ***,because Japanese open sabo dams are designed specifically for boulder-trapping,the ability of these dams to trap LWD remains *** particular,many problems have been reported with respect to sediment trapping by driftwood with roots in an open sabo dam *** objective of this study was to examine the trapping efficiency of open sabo dams for LWD and *** experimental approach clarified the influence of driftwood,without and with roots,on sediment trapping for a straight-channel *** flexible roots of the driftwood were shown to have a significant effect on the sediment trapping efficiency of the dam.

关键词： Driftwood open sabo dam Trapping efficiency Woody debris

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Post-analysis simulation of the collapse of an open sabo dam of steel pipes subjected to boulder laden debris flow

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International Journal of Sediment Research 2020年第6期35卷 621-635页

作者： Toshiyuki Horiguchi Vincent Richefeu Department of Civil Engineering National Defense Academy Universite Grenoble Alpes Laboratoire 3SR (solsSolidesStructuresRisques)

The objective of the proposed method is to utilize a site investigation of a debris flow disaster and verify a real scale analysis to evaluate the impulsive load on an open sabo *** Nagiso debris flow disaster which occurred in Nagano in 2014,where damage caused by Typhoon Neogri was *** verification result of the site investigation demonstrated the weak components of the open sabo dam experienced damage owing to the debris flow.A discrete element method is normally applied to a solid body to calculate an interaction function force with respect to the contact point between boulders and the *** numerical method initially concatenates elements that model the open sabo ***,the stiffness coefficient of flanges and coupling joints between pipes was expressed to utilize the sectional partition method to determine the structural *** method was improved to separate from the connecting elements beyond the boundary *** debris flow model uses a water flow distribution model,and the debris flow flowed from 200m upstream of the open sabo ***,the proposed method was examined to verify the primary cause of damage to the open sabo dam and used to reproduce the circumstances that evaluated the impulsive load occurrence mechanism in the case of a real *** addition,the coupling joints between the hollow steel pipes utilized a’reproduction analysis’ for a real sabo dam and a‘reinforced analysis’ for a reinforced sabo dam were applied to assess the weak point of the dam.

关键词： open sabo dam Site investigation damage verification Discrete element method

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