Influence of check dams on debris-flow run-out intensity

摘要: Abstract. Debris flows are very dangerous phenomena claiming thousands of lives and millions Euros each year over the world. Disaster mitigation includes non-structural (hazard mapping, insurance policies), active structural (drainage systems) passive (check dams, stilling basins) countermeasures. Since twenty years, many efforts devoted by scientific engineering communities to design proper devices able capture debris-flow volume and/or break down energy. If considerable theoretical numerical work has been performed on size, shape structure check allowing definition general criteria, it is worth noting that less research focused optimal location these dams along pathway. In this paper, a methodological framework proposed evaluate influence number reduction intensity (in term flow thickness, velocity volume). A model used simulate run-out debris flow. The uses Janbu force diagram resolve equilibrium equations; bingham fluid rheology introduced represents resistance term. calibrated two muddy events occurred in 1996 2003 at Faucon watershed (South French Alps). Influence quantified taking into account several configurations (number location) as input geometrical parameters. Results indicate decreasing with distance between source area first dams. study demonstrates small located near may decrease substantially alluvial fans.