There are four major ways in which vegetation influences slope stability:
wind throwing, the removal of water, mass of vegetation (surcharge), and mechanical reinforcement of roots
.
What is the role of vegetation in slope stability quizlet?
Vegetation provides
a protective cover that cushions the impact of falling rain
. This cushion allows the water to infiltrate the slope while retarding surface erosion. Plant roots add strength and cohesion to slope materials. … water erosion of the base or toe of a slope decreases its stability.
How does vegetation impact slope stability?
Vegetation helps stabilize
steep forested slopes chiefly by reinforcing the soil through tree roots and by changing the soil water regime
. Most slope failures occur during major storms when the soil is saturated. … Soil moisture in areas where the forest has been recently cut is usually greater than in uncut areas.
How does vegetation help Stabilise the soil?
Plant
roots bind sediment together
, making it harder to erode. Plant stems and leaves covering the ground surface protect sediment from wave erosion and erosion form tidal or longshore currents when exposed at high tide. They also prevent sediment from wind erosion at low tide.
Why does time play an important role in landslides?
why does time play an important role in landslides?
forces often change with time
; what may be affecting a slope one year may have less, no, or greater effect in subsequent years. … Natural vegetation is sometimes removed, further reducing slope stability.
How can afforestation increase slope stability?
Model simulations suggest that conversion of forested
slopes to
other vegetation types is likely
to increase
landslide frequency in the short-term, while
afforestation
of grassland or scrub
slopes
may
increase slope stability
.
Is removing vegetation from a slope decreases erosion True or false?
“Vegetation improves the resistance of slopes to both surficial erosion and mass wasting. Conversely, the removal of slope vegetation tends to
accelerate or increase slope failures
.” Gray and Sotir (1996).
What role does water play in slope stability?
The Role of Water
Since water is heavier than air, this increases the weight of the soil. Weight is force, and force is stress divided by area, so the stress increases and this can lead to slope instability. Water
has the ability to change the angle of repose
(the slope angle which is the stable angle for the slope).
What causes a slope to become unstable?
Slope failures occur
when driving forces overcome resisting forces
. The driving force is typically gravity, and the resisting force is the slope material’s shear strength. … Weathered geology: Weak, weathered bedrock, jointed rock, or bedrock that dips parallel to the slope can decrease stability.
What is the most common driving force of landslides?
Gravity
is the driving force behind landslide flow. Gravity is the attractive force between all massive objects. It causes apples to fall from trees toward the Earth, stars to pull planets into orbits, and cannonballs that are thrown skyward to return to the Earth.
How do you stabilize slopes?
Slopes can be stabilized by
adding a surface cover to the slope
, excavating and changing (or regrading) the slope geometry, adding support structures to reinforce the slope or using drainage to control the groundwater in slope material.
What are the 5 benefits of vegetation?
- Plants Reduce Stress. Countless clinical studies have proved that plants are indeed good to reduce stress, anxiety and fatigue.
- Help Reduce Sickness.
- Plants Help Clean the Air.
- They Help With Breathing.
- They Look Pretty Awesome.
How do you stabilize the slope of soil?
- Soil nailing. This is a cost effective method for long-term stabilisation of over-steepened soil slopes, on or around your site. …
- Slope drainage. Slope drainage is an important part of ensuring the future stability of a slope. …
- Facing systems. …
- De-vegetation.
What action can humans take to help prevent landslides?
There are also various direct methods of preventing landslides; these include
modifying slope geometry
, using chemical agents to reinforce slope material, installing structures such as piles and retaining walls, grouting rock joints and fissures, diverting debris pathways, and rerouting surface and underwater drainage.
How do landslides affect people’s lives?
People affected by landslides can also have short- and long-term mental health effects due to loss of family, property, livestock or crops. Landslides can also
greatly impact the health system and essential services
, such as water, electricity or communication lines.
What are 4 types of landslides?
They are classified into four main types:
fall and toppling, slides (rotational and translational), flows and creep
.
