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Landslides. Causes. Is landslide a natural process?. Climatic graph of Hong Kong. Any relation between rainfall and landslides?. Rain washes away the soil. Describe and explain the rainfall characteristics of Hong Kong. Heavy Prolonged Intense
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Landslides Causes
Describe and explain the rainfall characteristics of Hong Kong. • Heavy • Prolonged • Intense • Because HK belongs to tropical monsoon climate, which is hot and wet.
How does rain cause landslides? • Rain acts as a lubricant • which reduces friction • Soil becomes loose • Soil becomes saturated • Weight increases • unstable slopes
Summary: Conditions for landslides • Physical Factors – amount + duration + intensity of rain, thickness of soil layer, steepness of the slope • Human Factors – removal of vegetation, urban development, lack of maintenance, road cutting