What are the factors that control mass wasting?
Factors that change the potential of mass wasting include: change in slope angle, weakening of material by weathering, increased water content; changes in vegetation cover, and overloading.
Why does benching reduce the risk of mass movements?
Why does benching reduce the risk of mass movements? a. It increases the amount of vegetation of a slope.
What type of mass wasting is responsible for the greatest amount of property damage?
Creep is the most economically damaging and widespread type of material flow. Slow mass movement transports a greater volume of material than does rapid mass movement. Slumps occur most commonly in well-consolidated material.
What are the signs that you should watch out which indicates that a mass wasting event may occur?
Landslide Warning Signs Springs, seeps, or saturated ground in areas that have not typically been wet before. New cracks or unusual bulges in the ground, street pavements or sidewalks. Soil moving away from foundations. Ancillary structures such as decks and patios tilting and/or moving relative to the main house.
Are mass wasting and flood events connected?
Landslides can cause flooding by forming landslide dams that block valleys and stream channels, allowing large amounts of water to back up. Landslides can also cause overtopping of reservoirs and/or reduced capacity of reservoirs to store water.
Which mass movements is the fastest?
Landslides and avalanches can move as fast as 200 to 300 km/hour. Figure 3. (a) Landslides are called rock slides by geologists. (b) A snow avalanche moves quickly down slope, burying everything in its path.
What are the factors affecting mass movement?
Such factors include: weathering or erosional debris cover on slopes, which is usually liable to mass movement; the character and structure of rocks, such as resistant permeable beds prone to sliding because of underlying impermeable rocks; the removal of the vegetation cover, which increases the slope’s susceptibility …
How does deforestation affect mass movement?
Deforestation. Deforestation is particularly devastating in the tropics and causes mass wasting. Contrary to what a lush tropical rain forest would suggest, the fertile humus layer is very thin so is easy to erode. In fact, the soil is good only for a few seasons so farmers have to move on to new sections in the forest …
What are the processes of mass movement?
Mass movements include: generalized near-surface slope wasting; landslides, a large variety of movements involving masses of extremely various dimensions; deep-seated gravitational deformations, large-scale phenomena including sackungs, rock spreads, and deep-seated block slides; and subsidence, ground lowering, or …
What is the difference between mass wasting and mass movement?
Answer : Mass wasting is the removal of rock debris or the material of earth under the gravity. Mass wasting suits better than mass movement as this leads to removal of large amount of earth’s crust and also wastage of valuable rock/minerals over a surface.
Why is mass wasting dangerous?
Movement by mass wasting can be slow or rapid. Rapid movement can be dangerous, such as during debris flows. Areas with steep topography and rapid rainfall, such as the California coast, Rocky Mountain Region, and Pacific Northwest, are particularly susceptible to hazardous mass-wasting events.
What is a mass wasting trigger?
Mass-wasting events are triggered by changes that oversteepen slope angles and weaken slope stability, such as rapid snow melt, intense rainfall, earthquake shaking, volcanic eruption, storm waves, stream erosion, and human activities. Excessive precipitation is the most common trigger.
When large rocks become dislodged and drop down a steep slope the mass movement is called a?
When large rocks become dislodged and drop down a steep slope, the mass movement is called a FALL. 4. CREEPS are very gradual mass movements in which the whole slope moves downhill slowly.
Which process works with erosion to break down rock?
Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.
What is the main agent of erosion?
What is the most common and powerful agent of erosion?