Essay On Mass Wasting
Mass Wasting The Earth experiences mass wasting continuously, though sometimes at such a slow rate it is imperceptible. It occurs when “the force of gravity exceeds the strength of the slope material” (Grotzinger, et al., 2007, p 384). After weathering rock surface gets weaker and fragmented and is carried to a lower level where it can be transported even further by streams and rivers and it usually ends up in the sea (Tarbuck & Lutgens, 1997). Gravity is the primary force in mast wasting but water plays a very significant part in mass wasting.
Triggers of Mass Wasting
i. Earthquakes and their aftershocks dislodge vast amounts of material and the slump and landslides cause damage. ii. Weight When heavy rains and snow saturate the sediment it becomes more unstable and heavier particularly if vegetation has been removed. iii. Undercutting of bottom slope by water or engineering.
Landslide is a general term used for any apparent form of mass wasting. According to Edmund Keller, in “Introduction to Environmental Geology”
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Poor planning laws with buildings on slopes, undercutting of slopes for mining and road construction and removal of vegetation have all contributed to mass wasting. The landslide at Derrybrien in 2003 was responsible for 50,000 fish dying from pollution. Mass wasting has caused thousands of deaths. Although the financial losses can be very high, the loss of life particularly in underdeveloped countries can be catastrophic. The lack of technical knowledge and planning, the lack of or poor implementation of emergency services and high populations contribute to the high death tolls. However in some cases mass wasting has been prevented by man stabilising vulnerable areas. The key to prevention of mass wasting is prediction and if we can forecast some of these events the losses can be
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