HAHA HELLO EVERYONE! :D
In this nice little island SINGAPORE, natural processes are constantly taking place around us.
Mass movements such as landslides happen in Singapore too.
But first of all, let us look at the some definations which will help with our understanding of Mass Movements, with some examples that happened in Singapore, along with her mitigation efforts.
Mass Movement:
- refers to the downward (downslope) movement of material (rock,regolith and soil) on slopes
- under the influence of gravity without erosive agents like wind,ice or running water.
- mechanisms of mass movements are water,gravity,shear strength and shear stress
- 3 types of movement: slide,flow and heave
- examples : Landslides,mudflows,rockfalls and avalanches.
Slide:
- involves movement if coherent blocks of material along a well-defines surface
- examples: rock slide, avalanche or slump
Flow:
- involves continuous movement of material as a viscous fluid
- no sharply defined failure surface
- shear is distributed throughout moving mass
- differential movement (mass surface moving faster than the base)
- examples: mudflow,debris flow, earthflow
Heave:
- expansion of material near surface at right angles to the slope
- gravity causes material to move slightly
- caused by repeated freezing/thawing or wetting/drying cycles
- may result in creep
Alrights, after learning these definations, we will be looking further into 2 types of mass movements -- Landslides and Rockfall. Secondly, we will also be looking into real examples of such mass movements that happened in Singapore. Lastly, we will be looking at the mitagation efforts taken to deal with these mass movements. ((:
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