HUMAN ACTIVITIES THAT SPEED UP OR TRIGGER LANDSLIDES / EARTH & LIFE SCIENCE / SCIENCE 11 - MELC 17
Summary
TLDRThis video explains how human activities can accelerate or trigger landslides, which can cause significant damage and fatalities. It covers activities like mining, quarrying, land development, land pollution, excavation, and deforestation. The video also highlights ways to prevent or mitigate landslides, such as proper drainage, maintaining vegetation, using slope-friendly building designs, and hazard mapping. Practical measures like dewatering, slope reinforcement, and educating the public about landslide warning signs are also discussed. Viewers are encouraged to be proactive in preventing landslides and minimizing their impact.
Takeaways
- 🌍 Landslides are triggered by the movement of rocks, debris, or earth down a slope, causing harm to communities.
- 📚 There are different types of landslides, including falls, topples, slides, spreads, and flows, which have five different categories.
- ⛏️ Human activities such as mining, which involves using explosives, can trigger landslides by creating mini earthquakes.
- 🏗️ Quarrying, which involves excavating stone with explosives, can cause vibrations leading to landslides in slopes.
- 🏡 Land development, particularly altering landscapes for agriculture or housing, makes land more susceptible to landslides during heavy rainfall.
- 🛠️ Excavation and deforestation are significant contributors to landslides by destabilizing slopes.
- 💧 Proper drainage systems can help prevent landslides by directing water away from foundations and preventing soil oversaturation.
- 🌱 Vegetation cover and tree planting on slopes are effective ways to reduce soil erosion and landslide risks.
- 🏡 Construction on slopes should be adapted to the natural slope to minimize the risk of landslides.
- 🗺️ Hazard mapping and public education can help locate areas prone to landslides and prepare communities for potential risks.
Q & A
What is a landslide?
-A landslide is the movement of a mass of rock, debris, or earth down a slope that causes harm to the community.
What are the different types of landslides mentioned in the video?
-The types of landslides mentioned are falls, topples, slides, spreads, and flows, which have five different categories.
How can mining activities trigger landslides?
-Mining uses explosives underground, creating mini earthquakes that can cause landslides.
What is the role of quarrying in causing landslides?
-Quarrying involves excavation and blasting, which creates vibrations that can trigger landslides on slopes.
How does land development make areas more susceptible to landslides?
-Land development alters the shape of slopes or imposes new loads, making the land susceptible to soil liquefaction during heavy rainfall.
Why is deforestation a factor in triggering landslides?
-Deforestation removes trees, destabilizing already fragile slopes and making them more prone to landslides.
What are some methods mentioned to prevent landslides?
-Methods include checking drainage systems, maintaining vegetation cover, planting trees on slopes, minimizing irrigation, and adapting building designs to natural slopes.
Why is vegetation important in preventing landslides?
-Vegetation cover helps protect land from landslides and soil erosion, especially on slopes.
What are the signs that may indicate a potential landslide?
-Signs include leaning fences or walls, changes to surroundings, and the oversaturation of soil due to rain or water.
How can hazard mapping help in landslide prevention?
-Hazard mapping identifies areas prone to slope failures, helping in determining safer locations for building settlements.
Outlines
🌍 Introduction to Human Activities Triggering Landslides
This paragraph introduces the concept of landslides and their link to human activities. It explains how landslides, which involve the downward movement of earth, rock, or debris, can be triggered by various human actions. It also briefly recaps previous lessons on different types of landslides, including falls, topples, slides, spreads, and flows. Mining, quarrying, land development, land pollution, excavation, and deforestation are identified as human activities that can trigger or accelerate landslides.
🏗️ Human-Induced Landslide Factors and Mitigation Strategies
This paragraph delves into how specific human activities like mining, quarrying, land development, and deforestation contribute to landslides. It explains that mining uses explosives that create vibrations, leading to mini-earthquakes that cause landslides. Similarly, quarrying involves cutting and blasting that also triggers landslides. Land development, which alters the landscape, makes the soil more prone to liquefaction during rainfall. To mitigate landslides, several strategies are suggested, including checking drainage systems, maintaining vegetation, and planting trees on slopes to prevent erosion.
🛠️ Practical Measures to Prevent Landslides
The paragraph continues by offering practical methods to reduce the risk of landslides. It suggests measures like minimizing surface irrigation, ensuring building designs suit natural slopes, enforcing proper land use regulations, and watching for signs of potential landslides (like leaning fences). The importance of keeping waste off slopes and installing impermeable membranes to avoid soil oversaturation is highlighted. Techniques for slope stabilization, such as modifying slope geometry and reinforcing slope material with chemicals, are also discussed.
📊 Hazard Mapping and Public Education on Landslide Prevention
This final paragraph discusses hazard mapping, which helps locate areas prone to landslides and informs where settlements should be built. It also emphasizes the importance of educating the public about signs of impending landslides and safety measures to minimize their impact. The lesson concludes with a congratulatory note to the viewers, signaling the end of the video.
Mindmap
Keywords
💡Landslide
💡Mining
💡Quarrying
💡Land development
💡Deforestation
💡Excavation
💡Land pollution
💡Soil liquefaction
💡Hazard mapping
💡Slope stabilization
Highlights
Introduction to human activities that speed up or trigger landslides.
Review of previous knowledge: Landslides are the movement of mass like rock debris or earth down a slope causing harm to the community.
Types of landslides mentioned: falls, topples, slides, spreads, and flows with five different categories.
Landslides can cause significant fatalities, often linked to human activities.
Mining as a human activity: Using explosives underground creates mini earthquakes that can trigger landslides.
Quarrying: Explosives cause vibrations that trigger landslides on slopes.
Land development: Changing landscapes for agriculture or housing alters slopes, increasing susceptibility to landslides.
Land pollution: Degradation of land surfaces due to industrial waste, improper soil use, and mineral exploitation.
Excavation: Construction processes that involve moving earth, rock, or other materials with explosives increase landslide risks.
Deforestation: Removing forests destabilizes fragile slopes, increasing the risk of landslides.
Preventing landslides: Ensuring proper drainage systems to direct water away from home foundations.
Vegetation cover helps protect land from landslides and soil erosion.
Planting trees on slopes and slopes' base can prevent erosion.
Use of scientific research for effective land use regulations and building codes.
Hazard mapping helps identify areas prone to slope failures for safe building settlements.
Transcripts
hello grade 11
welcome in this video you will learn
about the different human activities
that speed up or trigger landslide
[Music]
previously you learned that landslide is
the movement of a mass of rock debris or
earth down a slope that causes harm to
the community
you also learned that there are
different types of landslides
we have the false
the tuples
the slides
the spreads and the flows which has five
different
categories landslides can cause a
significant number of fatalities which
are linked in human activities
some of these activities may speed up or
trigger
landslides first we have mining which is
the extraction
of valuable minerals or other geological
materials from the earth
it uses explosives underground which
create mini earthquakes that can cause
landslides
next is quarrying which refers to the
excavation or pit usually open to air
from which building stone slate or the
like
is obtained by cutting blasting etc it
also uses explosives in which
vibrations cause landslides in slopes
next is land development the changing of
landscape from a natural or semi-natural
state for a purpose such as agriculture
or housing which alters the shape of a
slope or which imposes
new loads on an existing slope land
development makes the land
susceptible to soil liquefaction which
may cause landslide during heavy
rainfall
we also have land pollution which is the
degradation of earth's land surfaces
often caused by human activities and its
misuse
some of the reasons are industrial
wastes exploitation of minerals and
improper use of soil
[Music]
another is excavation the process of
moving earth
rock or other materials with tools
equipment or explosives for
constructions to create building
foundations
reservoirs and roads
deforestation is also a factor of
landslide
this refers to the removal of a forest
or stand of trees from
land which involves the conversion of
forest land to farms
or economic infrastructure use which
destabilize
the already fragile slopes
many human cost landslides can be
avoided or mitigated
here are some number one
since water is the most common cause of
unstable slopes
landslides and erosion check your home's
drainage
system make sure drainage system directs
water
away from home foundation
number two vegetation cover protects
land from landslides and soil erosion
thus efforts should be made to maintain
greenery particularly on slopes
number three trees should be planted on
slopes
and slopes based to prevent erosion
number four minimizing irrigation on the
surface of the soil
[Music]
number five during construction of a
building on a slope the design that
suits the natural slope should be
adapted
[Music]
number six proper land use measures
adapt and effective land use regulations
and building codes based on scientific
research
number seven look for changes to your
surroundings that may signal the
likelihood of landslide activity
such as leaning fences or walls
number eight do not put waste on the
slopes of your community
[Music]
number nine dewatering or installing
impermeable membranes on existing slide
areas to prevent
oversaturation of soil due to rain or
water
number 10 direct methods of preventing
landslides such as modifying slope
geometry
using chemical agents to reinforce slope
material
installing structures such as piles and
retaining walls
grouting rocks joints and fissures
diverting debris pathways
and re-routing surface and underwater
draining
number 11 hazard mapping locate areas
prone to slope failures
this method identify areas for building
settlements
[Music]
and number 12 the public should be
educated about
signs that a landslide is approaching
thus
safety measures may be taken to reduce
the impact
and that ends our lesson congratulations
thank you for watching
[Music]
summing up
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