How Does Water Influence Mass Wasting


How Does Water Influence Mass Wasting?

Adding water increases slope instability. It lubricates rock fragments so that they slide down slope more easily. Mass wasting occurs more readily in rainy seasons for this reason. It turns out that a small amount of water in the soil can aid slope stability because of increased surface tension.

What role does water play in mass wasting?

Water also increases the mass of the soil this is important because an increase in mass means that there will be an increase in velocity if mass wasting is triggered. Saturated water however eases the process of mass wasting in that the rock and soil debris are easily washed down-slope.

How can water affect mass movement?

How does water affect mass wasting processes? In general water speeds up ordinarily slow mass wasting processes and greatly increases the chances that faster moving processes will occur. … Water in pores and cracks displaces air so water adds to the mass of soil and broken rock on a slope.

What are the factors that influence mass wasting?

More on this later.
  • Composition of Slope Material. Another factor that determines mass wasting is the slope’s material. …
  • Weight and Friction of Slope. A third factor that influences whether a slope will fail is the load or weight of that slope. …
  • Regional Climate Conditions. …
  • Water Content within Slopes. …
  • Gravity.

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How does water affect mass wasting processes Please select all that apply?

How does water affect mass wasting processes? Water does not transport the soil but rather gravity allows the material in motion. … It eliminates plants that anchor the soil. It makes the soil dry and loose and more easily able to move down steep slopes.

How can water encourage mass flow?

Water can greatly contribute to mass movement. By washing away the smaller particles in the rock or soil the remaining material cannot hold together…

How water influences the cohesion of unconsolidated sediment?

Unconsolidated sediments tend to be strongest when they are moist because the small amounts of water at the grain boundaries hold the grains together with surface tension. Dry sediments are held together only by the friction between grains and if they are well sorted or well rounded or both that cohesion is weak.

What prevents mass wasting?

Engineering solutions include barriers and retaining walls drainage pipes terracing the slope to reduce the steepness of the cuts and immediate revegetation. Rockfalls can be controlled or eliminated by the use of rock bolts cables and screens and by cutting back slopes to lesser gradients.

What is the fastest form of mass wasting?

rock fall

A rock fall are the fastest of all landslide types and occurs when a rock falls through the air until it comes to rest on the ground—not too complicated.

Is sometimes triggered by water rainfall in a displaced mass?

Toppling is sometimes driven by gravity exerted by the weight of material upslope from the displaced mass. Sometimes toppling is due to water or ice in cracks in the mass. Topples can consist of rock debris (coarse material) or earth materials (fine- grained material). Topples can be complex and composite.

Which of these are potential triggers for mass wasting events?

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.

What is mass wasting explain the various process of mass wasting?

Mass wasting is the movement of rock and soil down slope under the influence of gravity. … Rock falls slumps and debris flows are all examples of mass wasting. Often lubricated by rainfall or agitated by seismic activity these events may occur very rapidly and move as a flow.

How is mass wasting unique from wind water and ice?

As an erosional process how is mass wasting unique from wind water and ice? Mass wasting does not require a transporting medium.

What is flow in mass wasting?

Mass wasting – is movement in which bed rock rock debris or soil moves downslope in bulk or as a mass because of the pull of gravity. … Flow – The debris is moving downslope as a viscous fluid. A mudflow is a flowing mixture of debris and water usually moving down a channel.

What is the primary role water plays in triggering landslides?

Water can trigger landslides and mudslides because it alters the pressure within the slope which leads to slope instability. Consequently the heavy water-laden slope materials (soil rock etc.) will succumb to the forces of gravity. Excessive water is thought to be one of the most common triggers for landslides.

How does water trigger slope failure?

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).

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What is the ultimate cause of mass wasting?

Mass wasting which is sometimes called mass movement or slope movement is defined as the large movement of rock soil and debris downward due to the force of gravity. … The causes of mass wasting include an increased slope steepness increased water decreased vegetation and earthquakes.

What are five events that can trigger a mass movement?

This wearing down or erosion is due to factors such as water the steepness of the slope the removal of vegetation and disruptive events such as earthquakes.

Why is water an important factor in mass movements?

Although water is not always directly involved as the transporting medium in mass movement processes it does play an important role. … Water can reduce the friction along a sliding surface. Water has the ability to change the angle of repose (the slope angle which is the stable angle for the slope).

What are four ways to prevent mass movements?

Mass movement control must be primarily preventive: e.g. mapping vulnerable zones drawing up a land use plan banning building work or any modification of slopes and protection in the form of coppice forests.

How does drainage reduce mass movement?

Drainage Controls

One component in landslide mitigation is basic drainage control of water. Recall that water can cause slopes to lose their friction as water lubricates individual grains of soil. And if you cut a slope and put a retaining wall for support you may be preventing the water from filtering through.

Which agent of erosion water Wind ice or gravity causes mass movement?

Gravity can cause erosion and deposition. Gravity makes water and ice move. It also causes rock soil snow or other material to move downhill in a process called mass movement.

What are the 6 types of mass movement?

Types of mass movement
  • Rockfall. Bits of rock fall off the cliff face usually due to freeze-thaw weathering.
  • Mudflow. Saturated soil (soil filled with water) flows down a slope.
  • Landslide. Large blocks of rock slide downhill.
  • Rotational slip. Saturated soil slumps down a curved surface.

What is the slowest mass wasting process?

The slowest and least noticeable but most widespread of the slow mass wasting categories is creep. Creep involves the entire hillside and is characterized by very slow movement of soil or rock material over a period of several years.

What is slump mass wasting?

A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or a rock layer moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface. … Translational slumps occur when a detached landmass moves along a planar surface.

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Which is one of the most dramatic triggers of sudden mass movements?

Term what is mechanical weathering Definition the physical disintegration of rock resulting in smaller fragments
Term one of the most dramatic triggers of sudden mass movements is a(n) Definition earthquake

Which of the following does not trigger mass wasting?

There are various factors which trigger mass movement. Some of the most important are: saturation of surface material vibrations during earthquakes oversteepened slopes. What does not trigger mass movement is rich vegetation on slopes.

Which of these are potential triggers for mass wasting events quizlet?

What types of events may trigger mass wasting events? heavy rain human activity earthquakes volcanic activity long periods of drought with heavy sediment buildup on slopes and rare episodes of heavy precipitation.

How is water an agent of erosion?

In streams water is a very powerful erosional agent. … Streams erode their banks in three different ways: 1) the hydraulic action of the water itself moves the sediments 2) water acts to corrode sediments by removing ions and dissolving them and 3) particles in the water strike bedrock and erode it.

How does mass wasting affect the environment?

Mass movements affect the following elements of the environment: (1) the topography of the earth’s surface particularly the morphologies of mountain and valley systems both on the continents and on the ocean floors (2) the character/quality of rivers and streams and groundwater flow (3) the forests that cover much …

Where do the most rapid mass wasting events occur?

In what kind of setting do most rapid mass-wasting events occur? Areas of rugged geologically young mountains (ex. landslides).

What form of mass movement is caused by an earthquake in an area with water laden sediments?

A turbidity current is a rapid downhill flow of water caused by increased density due to high amounts of sediment. Turbidity currents can be caused by earthquakes collapsing slopes and other geological disturbances.

Is the laying down of sediment carried by wind water or ice?

Deposition is the laying down of sediment carried by wind flowing water the sea or ice. Sediment can be transported as pebbles sand and mud or as salts dissolved in water.

What are three types of mass wasting?

The most common mass-wasting types are falls rotational and translational slides flows and creep. Falls are abrupt rock movements that detach from steep slopes or cliffs. Rocks separate along existing natural breaks such as fractures or bedding planes. Movement occurs as free-falling bouncing and rolling.

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