TY  - JOUR
PY  - 2012//
TI  - Measurements of hillslope debris flow impact pressure on obstacles
JO  - Landslides
A1  - Bugnion, Louis
A1  - McArdell, Brian
A1  - Bartelt, Perry
A1  - Wendeler, Corinna
SP  - 179
EP  - 187
VL  - 9
IS  - 2
N2  - 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 m 3 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.<p />
LA  - en
SN  - 1612-510X
UR  - http://dx.doi.org/10.1007/s10346-011-0294-4
ID  - ref1
ER  -