GEOG 1F91 Lecture Notes - Lecture 6: Eramosa Karst, Shear Strength, Slope Stability
18 Feb 2016
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Document Summary
Decay of rock forming minerals h2o temp, o2, mild acids. Metals combine with oxygen (water) to form oxides. Measure how acidic/basic a substance is concentration of h ions. Scale 0-14- each step = 10x change. E. g. ph of 4 is 10x more acidic than 5. Hydrolysis water added to mineral structure. Emissions so2 =sulphuric acid no2= nitric acid. Morphology vary with geology, climate and erosion. Slope stability driving forces (promote movement) Shear stress (gravity) + material (e. g. weight) slope angle (oversteepen)water, etc. Shear strength (soil or rock) cohesion (hold together) + friction (*water also cohesive) If resisting forces (shear strength) is greater than the driving forces (shear stress) =stable slope. If resisting forces (shear strength) are less than driving forces = unstable slope (slope failure = mass wasting) Bedrock (rock type, planes of weakness, etc. ) Mass wasting: solification (slow) slow downhill movement of saturated material surface thaws= water rich layer.
