groundwater chapter 10. movement and storage if precipitation doesn’t runoff the surface it...
Post on 13-Jan-2016
218 Views
Preview:
TRANSCRIPT
GroundwaterGroundwater
Chapter 10Chapter 10
Movement and StorageMovement and Storage
• If precipitation doesn’t runoff the surface it infiltrates into the ground.
• Well sorted sediments allow water to infiltrate into the ground more easily than poorly sorted sediments.
• Porosity- % of pore space.
Zone of SaturationZone of Saturation
• Zone of saturation- the depth below the Earth’s surface in which ground water fills all the pore spaces.
Ground water movementGround water movement
• Permeability- the ability of a material to let water through.
Ground water movementGround water movement
• Aquifers- permeable layers
Groundwater ErosionGroundwater Erosion
• Dissolution- the process of dissolving calcium carbonate
• Caves- a natural underground opening with a connection to the earth’s surface
• Karst topography- limestone regions that have sinkholes, sinks, and sinking streams.
Groundwater ErosionGroundwater Erosion
• Sinkhole- a depression in the ground caused by the collapse of a cave or by direct dissolution below the earth’s surface.
Groundwater depositsGroundwater deposits
• Hard Water- water that contains a high concentrations of calcium, magnesium, or iron.
• Stalactites- deposits that hang from a cave’s ceiling
• Stalagmites- drip stone deposit that forms below a stalactite.
Groundwater systemsGroundwater systems
• Springs- natural discharge of ground water at the earth’s surface
Groundwater systemsGroundwater systems
• Hot springs- springs that discharge water well above the average air temperature.
• Geysers- explosive hot springs
WellsWells
• Well- a hole dug or drilled into the ground to reach a reservoir of ground water
WellsWells
• Artesian Well- water is forced out of the round because of pressure from the recharge area.
Threats to water useThreats to water use
• Overuse-
Threats to water useThreats to water use
• Subsidence- sinking of land due to excessive withdrawal of groundwater
• Pollution
Threats to water useThreats to water use
• Chemicals-
• Salt-
top related