Explain the relationship between rain and landslide
Answers
Answer: Here u go!!
Explanation:
Rainfall is the most important and frequent trigger of landslides. Commonly, it contributes to the triggering of the landslides by means of infiltration into the slope cover, which causes an increase in the pore pressure value and a decrease in the soil suction value. The causes of landslides are usually related to instabilities in slopes. It is usually possible to identify one or more landslide causes and one landslide trigger.
Landslides occur when the slope changes from a stable to an unstable condition. A change in the stability of a slope can be caused by a number of factors, acting together or alone.
At the time of heavy rains, natural cracks and fissures (splits) present in hard rock’s cause their breaking. When water enters these cracks, it causes weathering of these rocks. Weight increases, these rocks slide on the sloppy region and settle at the lower side. This is called collapse of rift. The heavy rainfall leads to the down-slope movement of soil and rock under the direct influence of gravity which causes landslide.
Natural Causes for landslide include (reasons):
1. Groundwater (pore water) pressure acting to destabilize the slope.
2. After effects of natural disasters like earthquake, tsunami, heavy rains, storms, floods cause landslide.
3. Unlimited cutting of trees causes soil erosion.
4. While building roads in mountains, there is a lot of digging, which makes the mountain weak.
Effects of landslide due to heavy rainfall:
1. Rivers get flooded and change their paths.
2. Displacement of waterfalls, formation of artificial water reservoirs.
3. There is live and financial loss on a large scale, as trees, buildings, rocks on sloppy area collapse on low-lying land.
4. Landslide affects the traffic, causing roads blockage.
5. Landslide destroys plant life on it.
6. Causes a threat to animal life as well.