Geomorphic Threshold and Landslide - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 146

Fig. 5.1 Tri-axial soil testing mechanism
Fig. 5.2 Mohr stress diagram
The upslope contributing area (b) was estimated considering multiple flow direction
where the cumulative flow at a point (surrogated by the upslope area) should be
distributed among more than one neighboring down slope pixel (Borga et al. 1998 ).
5.2.2 Determination of Threshold Slope Angle for Initiation
of Slide
The formation of road-cut benches introduces the steep back slope and the slope on
the landslide scar is greater than the angle of repose. This situation is mainly
responsible for instability. The stability equation for a mass of loose, friable
cohesion less debris after (Melnikov and Chensokov 1969 ) is as following.