Measurements of hillslope debris flow impact pressure on obstacles |
| |
| Authors: | Louis Bugnion Brian W McArdell Perry Bartelt Corinna Wendeler |
| |
| Institution: | 1. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
2. Geobrugg AG, Romanshorn, Switzerland
|
| |
| Abstract: | We present measurements of hillslope debris flow impact pressures on small obstacles. Two impact sensors have been installed in a real-scale experimental site where 50?m3 of water-saturated soil material are released from rest. Impact velocities vary between 2 and 13?m/s; flow heights between 0.3 and 1.0?m. The maximum impact pressures measured over 15 events represent between 2 and 50 times the equivalent static pressures. The measurements reveal that quadratic velocity-dependent formulas can be used to estimate impact pressures. Impact coefficients C are constant from front to tail and range between 0.4?<?C?<?0.8 according to the individual events. The pressure fluctuations to depend on the sensor size and are between 20% and 60% of the mean pressure values. Our results suggest that hazard guidelines for hillslope debris flows should be based on quadratic velocity-dependent formulas. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
