Earth Science - Landscape Change
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10 Terms
vertical component of gravity
cohesion of the soil particles
What is shear strength?
the component of gravity downslope and the lack of friction between rock and soil
What is shear stress?
increases
Does vegetation decrease or increase cohesion and shear strength?
𝐺𝑑 = 𝐺 𝑠𝑖𝑛𝛽
equation to work out shear stress?
F=mg
equation to work out gravitational force on slope
the stronger the force
the longer the vector arrow…
slope will be unstable
if friction is longer than shear stress then slope is stable
if they are equal, slope is about to slide
When friction is less than shear stress…
S𝐹 = 𝐹/𝐺𝑑
Equation for shear strength/safety factor
slope is stable
SF<1.3 = unstable
SF 1-1.3 = conditionally stable
when SF>1.3…
must use a different more complex equation to determine slope stability
top layer most important to determing stabilty
regolith/sediment very porous - if wet, cohesion increases
generally less stable
how does a top layer of regolith/unconsolidated sediments impact slop stabilty
Note 
Flashcards (21)