Regulation effect of slit-check dam against woody debris flow: Laboratory test

Woody debris flows (i.e., carrying wood) are common in mountainous and forested areas. They can cause more severe hazards due to the effects of LW (woody larger than 1 m length 10 cm width) compared without LW. Mitigation structures for have considered little regulating effect on influence regulation sediment. Thus, model tests were conducted discuss slit-check dams woody flow. Research results demonstrated that effectively regulate overflows. Once overflow occurs, sediment trapping efficiency wood retention rate dramatically decrease. The shared a linear relationship with relative opening width, height-to-width ratio opening, density . However, this was also influenced by A logarithmic between obtained. is mainly determined channel width dam. Three draining patterns at dam three clogging types openings observed. Some design criteria structure parameters proposed. These research promote better understanding provide basis optimal dams.