Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Geohazards

No description
by

Maeven Darlie Turner

on 8 October 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Geohazards

Geohazards
taking precautions and protecting life
EEn.2.1.3
explain precautions that can be made to protect life from various geohazards and include meteorological hazards. ex) landslides, earthquakes, tsunamis, sinkholes, groundwater pollution, and flooding
So what's the solution?
reducing the risks
EEn.2.1.4
Conclude the best location for various types of development to reduce impacts by geohazards and protect property.
what are geohazards?
Geohazard: a geological state that has the potential to lead to widespread damage. These can be naturally occurring(such as earthquakes or tsunamis), or human-induced(landslides)
Why is this an issue?
earthquakes:
may trigger massive landslides
cause trees to fall over or sink into ground(if liquefaction occurs)
Buildings can be damaged by the shaking of the earthquake alone or when the ground beneath them settles to a different level than it was before the earthquake started(known as subsidence)
can rupture dams or levees along a river
notice most of these risks are actually caused by man-made structures
Tsunamis:
a larger ocean wave generated by vertical motions of the sea floor during an underwater disturbance(earthquake, volcanic eruption, landslide, meteorite)
flooding, contamination of drinking water, fires from gas lines or ruptured tanks
destruction of structures
p.s. you cannot outrun a tsunami- you will most-likely drown...
Groundwater pollution:
any pollutant that, when it reaches an aquifer can make the water unsuitable for a particular purpose
can be man made, or natural such as mineral and metallic deposits
sources: sewage, industrial waste, landfills, agricultural chemicals
radioactive radon gas- generated by radioactive decay of uranium in rocks and sediments- occurs in low concentrations in all groundwater
infectious diseases in humans
nutrient pollution affecting plants and animals
make buildings more stable(no concrete or stone structures), use wood, steel frames
rest structures on large rubber structures that absorb most vibrations of earthquakes

buildings should be at least 200 meters away from the high tide coastline
reinforce buildings so that they are more likely to withstand the impact of a wave
Precautions:
build impermeable underground barriers
groundwater can be pumped out for treatments on surface
be aware of the location of your well, its age, and its distance/separation from other wells
keep activities such as pesticide mixing and tank rinsing or gasoline storage farther away from your well
Precautions
Meteorological hazards
caused by extreme weather and can be violent or sudden destructive change to the environment related to or affecting the earth's atmosphere, especially the weather-forming processes. ex) blizzards, cyclones, droughts, hailstorms, heat waves, hurricanes,tornadoes
Various kinds...
Blizzards:
can effect transportation
crops
animals
people
cause carbon monoxide poisoning due to use of alternate heat sources
infections from frostbite
hypothermia
Take precautions:
apply weather stripping to doors and windows in your home
keep tree branches trimmed(ones that can fall on your home during heavy snowfall)
be aware of further safety precautions for when this actually starts to happen
Cyclones/Hurricanes:
can cause flooding
can block sewage pipes, causing sewage to spill resulting in disease and groundwater pollution
remove forest canopy and change the landscape near coastal areas due to moving and reshaping of sand dunes, causing extensive erosion along coast
can cause mudslides and landslides
standing water prior to cyclone can cause spread of disease
flying debris causes damage to trees and habitats
precautions:
take proper precautions to protect your home
Unfortunately, since we cannot reduce the intensity of cyclones, we cannot really prevent damage. All we can do is try to be individually prepared and educated to save ourselves.
Droughts:
long term shortage of precipitation causing a lack of water supply
hunger and famine
thirst/dehydration
disease
wildfire
social conflict- potentially war
forced migration/relocation
loss/destruction of wildlife habitats
increased stress on endangered species-potential extinction
poor soil quality
Hail storms:
birds, livestock, and other animals are unable to find proper shelter and can be killed or seriously injured
damage vegetation and strip trees of their leaves and bark
precautions:
hail netting/protective canopies for crops
Right here.

Just think about it.

How many large scale, naturally occurring environmental disasters do we experience each year?

blizzards?....yeah, right
drought?....not too uncommon but usually not too extreme
hailstorms?...sometimes...the size of nickles maybe
hurricanes?...yes, we deal with the heavy rain of hurricanes around the good old state of North Carolina but we rarely really get hit by a lot of devastation(knock on wood)
earthquakes?....not really
tsunamis?....almost unheard of here
groundwater pollution?...that's a different story. But no matter where you put a civilization, there will always be us- irresponsible, lazy human beings(in general) that somehow cause pollution, but we can at least control that to some extent.
What do you think?
There's not one.
Sinkholes:
can be natural or human-induced
natural sinkholes occur due to erosion or underground water
human-induced sinkholes can be caused by drilling, mining, construction, or broken water/drain pipes
can form on land or in the ocean
can change generally topography of area
divert streams of underground water
can cause damage to human life and property as well as habitats and animal life
toxic chemicals beneath the earth can come up and pollute groundwater
can drain away lakes and streams
can raise water table, increasing chances of flood during heavy rainfall
Precautions:
soil tests during construction
treating underground limestone to withstand harmful waters
redirecting surface waters
Lab:

purpose: to demonstrate the formation of sinkholes and how they affect the environment around them.
Q: How do you think we could prevent the occurrence of a human-induced sinkhole?
Full transcript