solution processes and karst topography chapter 17
TRANSCRIPT
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Solution Processes and Solution Processes and Karst TopographyKarst Topography
Chapter 17Chapter 17
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Solution Processes and Karst Solution Processes and Karst TopographyTopography
Solution and PrecipitationSolution and Precipitation Caverns and Related FeaturesCaverns and Related Features Karst TopographyKarst Topography Hydrothermal FeaturesHydrothermal Features
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Relative Solubility in WaterRelative Solubility in Water
This diagram This diagram demonstrates the demonstrates the solubility of solubility of common rock common rock forming elementsforming elements
Sodium and Sodium and calcium are very calcium are very soluble soluble
Aluminum is NOTAluminum is NOT
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CavernsCaverns
Large caves or chambers in cavesLarge caves or chambers in caves Found anywhere there’s a massive Found anywhere there’s a massive
limestone deposit at/near the surfacelimestone deposit at/near the surface Usually larger horizontally than verticallyUsually larger horizontally than vertically Connection to surface can small or hiddenConnection to surface can small or hidden Can be very extensive system of “rooms”Can be very extensive system of “rooms” Stream may flow along floorStream may flow along floor
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Cavern FormationCavern Formation Solution of underground water trickles Solution of underground water trickles
along bedding planes and joint systemsalong bedding planes and joint systems Water dissolves limestone bedrock and Water dissolves limestone bedrock and
leaves holesleaves holes Water leaves behind compounds it carried Water leaves behind compounds it carried
in solutionin solution
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Cavern FeaturesCavern Features Water dripping from roof forms Water dripping from roof forms
stalactitestalactite – icicle – icicle Water hits floor and builds upward - Water hits floor and builds upward -
stalagmitestalagmite
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Karst TopographyKarst Topography
Karst LandformsKarst Landforms– SinkholeSinkhole– Tower KarstTower Karst
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Karst TopographyKarst Topography
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Limestone and Karst RegionsLimestone and Karst Regions
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Development Development of Karst of Karst
TopographyTopography
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Tower KarstTower Karst
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SinkholesSinkholes
Closed depressions in the land surface formed Closed depressions in the land surface formed by dissolution of near-surface rocks or by the by dissolution of near-surface rocks or by the collapse of the roofs of underground channels collapse of the roofs of underground channels and caverns.and caverns.
Natural, common geologic feature in places Natural, common geologic feature in places underlain by soluble rocksunderlain by soluble rocks
Natural conditionsNatural conditions = they form slowly and = they form slowly and expand graduallyexpand gradually
UnnaturalUnnatural = dredging, constructing reservoirs, = dredging, constructing reservoirs, diverting surface water, and pumping ground diverting surface water, and pumping ground water can accelerate the rate of sinkhole water can accelerate the rate of sinkhole expansion - resulting in the abrupt formation of expansion - resulting in the abrupt formation of collapse-type sinkholes, some of which are collapse-type sinkholes, some of which are spectacular spectacular
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Florida Florida SinkholesSinkholes
Most of central Florida underlain by limestone bedrockPopulation growth has drained ground waterSparse rainfall in the 70’s accelerated drawdown of water tableNumber of sinkholes increasedApprox 1/d in 80’s
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Hydrothermal FeaturesHydrothermal Features Hot SpringsHot Springs GeysersGeysers FumarolesFumaroles
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Hot SpringsHot Springs
Water heated Water heated below groundbelow ground
Sometimes due to Sometimes due to proximity of proximity of magmamagma
Finds path of Finds path of least resistance least resistance to surfaceto surface
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Geysers FumarolesGeysers Fumaroles
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Yellowstone National ParkYellowstone National Park
Geyser BasinsGeyser Basins Travertine TerracesTravertine Terraces
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Yellowstone Yellowstone Geyser BasinsGeyser Basins
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Chapter 18 Chapter 18
The Topography of Arid LandsThe Topography of Arid Lands
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The TopographyThe Topographyof Arid Landsof Arid Lands
Running Water in Waterless Running Water in Waterless RegionsRegions
Ergs, Regs, and Hamadas Ergs, Regs, and Hamadas The Work of WindThe Work of Wind Desert Landform AssemblagesDesert Landform Assemblages
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Arid LandsArid Lands
We are concerned with the processes We are concerned with the processes that shape arid lands – not just the that shape arid lands – not just the bordersborders
Usually think of desertUsually think of desert Not always soNot always so Can refer to semiarid, subhumid and Can refer to semiarid, subhumid and
humid regionshumid regions
Remember: Water is by far the most important external agent of landform development!
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Terrain Forming ProcessesTerrain Forming Processes
Same processes in humid and arid Same processes in humid and arid areasareas
Desert landforms are much different Desert landforms are much different from those found in wetter areasfrom those found in wetter areas
Factors for difference:Factors for difference: WeatheringWeathering CreepCreep Soil & RegolithSoil & Regolith Impermeable surfacesImpermeable surfaces SandSand
RainfallRainfall DrainageDrainage WindWind Basins of Interior DrainageBasins of Interior Drainage VegetationVegetation
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Considerable accumulation of sand forms sand dunes
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Running Water in Arid RegionsRunning Water in Arid Regions Surface Water in the DesertSurface Water in the Desert
– Exotic StreamsExotic Streams– Ephemeral StreamsEphemeral Streams– PlayasPlayas
Fluvial ErosionFluvial Erosion– InselbergsInselbergs– PedimentsPediments
Fluvial DepositionFluvial Deposition
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Exotic Stream: Exotic Stream: The Nile RiverThe Nile River
Flows for many hundreds of miles not being joined by tributaries
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Pleistocene LakesPleistocene Lakes
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Differential ErosionDifferential Erosion
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BornhardtBornhardt
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Piedmont ZonePiedmont Zone
Any deposition at the foot of a mountain range
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Erg: A “Sea of Sand”Erg: A “Sea of Sand”
Classic “sea of sand”
Large area covered with loose sand
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WindWind
Aeolian ErosionAeolian Erosion Aeolian TransportationAeolian Transportation Aeolian DepositionAeolian Deposition
– Desert DunesDesert Dunes– Coastal DunesCoastal Dunes– LoessLoess
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Aeolian Aeolian ErosionErosion
Aeolian Aeolian TransportationTransportation
Horizontal transport
Fine grained sand
Larger bits moved by saltation and traction
Lack of vegetation to anchor
2 parts:
Deflation small, loose particles
Blowout depression
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LoessLoessFine grained, calcerous and subject to vertically cohesive
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Major Loess DepositsMajor Loess Deposits
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Desert Landform AssemblagesDesert Landform Assemblages Basin-and-Range TerrainBasin-and-Range Terrain
– RangeRange– PiedmontPiedmont– BasinBasin
Mesa-and-Scarp TerrainMesa-and-Scarp Terrain– Differential ErosionDifferential Erosion
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Landforms of the SouthwestLandforms of the Southwest
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Basin-and-Range LandscapeBasin-and-Range LandscapePediment created from erosion not deposition
Piedmont created from deposition
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Playas and Alluvial FansPlayas and Alluvial FansPlaya is a dry lake bed
Alluvial fan is part of a piedmont region - deposition
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Mesa and Scarp Mesa and Scarp TerrainTerrain
Mesa and Scarp Mesa and Scarp FormationFormation
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DesertificationDesertification
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Chapter 20 Chapter 20
Coastal Processes and Coastal Processes and TerrainTerrain
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Coastal Processes and TerrainCoastal Processes and Terrain
Coastal ProcessesCoastal Processes– Forces That Shape CoastlinesForces That Shape Coastlines– Coastal Sediment TransportCoastal Sediment Transport– Coastal DepositionCoastal Deposition
Coastal LandformsCoastal Landforms– Depositional LandformsDepositional Landforms– Shorelines of SubmergenceShorelines of Submergence– Coral CoastsCoral Coasts
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What are coastlines?What are coastlines?
Coastlines are the transition from land Coastlines are the transition from land to waterto water
Not permanent featuresNot permanent features Always subject to erosion & depositionAlways subject to erosion & deposition They are at the interface of the 3 major They are at the interface of the 3 major
components of Earth’s environment:components of Earth’s environment:– HydrosphereHydrosphere– LithosphereLithosphere– AtmosphereAtmosphere
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Coastal ProcessesCoastal Processes
WindWind is a major force – it moves the is a major force – it moves the water, creating waves and currentswater, creating waves and currents
Waves & currents shape coastlines Waves & currents shape coastlines and create topographic featuresand create topographic features
Waves = erosion = headlandsWaves = erosion = headlands Currents = deposition = beaches & Currents = deposition = beaches &
sandbarssandbars
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Coastal ProcessesCoastal Processes
TidesTides Diastrophic EventsDiastrophic Events
– EarthquakesEarthquakes– VolcanoesVolcanoes
Sea or lake level changeSea or lake level change– Tectonic forcesTectonic forces– Eustatic changeEustatic change
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Exceptions to Lakeshore ChangeExceptions to Lakeshore Change
Tidal range is insignificantTidal range is insignificant Water level rise/fall different processWater level rise/fall different process Coral reefs occur only in tropical or Coral reefs occur only in tropical or
sub-tropical sub-tropical oceansoceans.. Force of ocean water creates more Force of ocean water creates more
dramatic topographic featuresdramatic topographic features
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WavesWaves
Waves are agents of erosion
Headlands are promontories of sloping land projected into the sea
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WavesWaves
Appear to move but don’t, except Appear to move but don’t, except when they breakwhen they break
Energy passes through the water, Energy passes through the water, causing the water to undulatecausing the water to undulate
Most are wind generated – action of Most are wind generated – action of friction of wind moving across waterfriction of wind moving across water
Transfer of energy from wind to Transfer of energy from wind to water initiates wave actionwater initiates wave action
Small number of waves from volcanic Small number of waves from volcanic or diastrophic activityor diastrophic activity
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Development of WavesDevelopment of Waves
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Wave RefractionWave Refraction
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Eustatic Sea Level ChangeEustatic Sea Level Change
Sea level change due to amount of Sea level change due to amount of water in sea/oceanwater in sea/ocean
Related to action Related to action of continental ice of continental ice sheetssheets
Ellesmere Island, Canada
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TidesTidesCavendish Beach, PEI
Bay of Fundy, NS
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Tidal CharacteristicsTidal Characteristics
Not significant agents of erosionNot significant agents of erosion Significant erosion only in narrow Significant erosion only in narrow
bays, margins of shallow seas, and bays, margins of shallow seas, and passages between islandspassages between islands
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Normal High TidesNormal High Tides
What you should know about tides:
The Moon pulls at Earth – the Sun pulls at Earth and this is what causes tides
Position of Sun, Moon & Earth cause variation in tides
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Highest Tidal RangesHighest Tidal Ranges
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Stream OutflowStream Outflow
Madagascar
Stream outflow is a major contributor of sediment to oceans
This sediment is then transported by coastal waters
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Erosion – Rocky CoastlineErosion – Rocky Coastline
Port Campbell, Australia
Most erosion along the coast is due to wave action
Air is forced into cracks in the rocks as the wave hits the shore
When the wave recedes, the air expands loosening the sections of rock
This is a major process of erosion
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Erosion – Cliff CoastlineErosion – Cliff CoastlineWave Cut Notch
b) Erosion at sea level or just above
c) As notch is cut, cliff is undercut and falls away
d) The cliff face retreats, until it reaches bedrock - then you have a headland
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Formation of ArchesFormation of Arches
Victoria, Australia
1985
1992
Continuous pounding wave action
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Erosion - SandErosion - Sand
Currents and tides cause erosionCurrents and tides cause erosion Storms accelerate erosionStorms accelerate erosion A major storm can remove an entire A major storm can remove an entire
beach in a few hours – eroding down beach in a few hours – eroding down to the bedrockto the bedrock
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Sediment TransportSediment Transport Nearly all sediment transport on Nearly all sediment transport on
coastlines is accomplished by wave coastlines is accomplished by wave action and action and locallocal currents currents
Mechanisms:Mechanisms: Longshore CurrentsLongshore Currents strike at an strike at an
angle almost parallel to the shore - angle almost parallel to the shore - “along the shore”“along the shore”
Beach DriftingBeach Drifting is downwind is downwind displacement of particles along coastdisplacement of particles along coast
Movement with ebb and surge of tide Movement with ebb and surge of tide tumbles particles and reduces sizetumbles particles and reduces size
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Coastal Coastal Sediment Sediment TransportTransport
Longshore Current
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DepositionDeposition
Most coastal deposition is of fine Most coastal deposition is of fine sand particlessand particles
During storms larger particles/pieces During storms larger particles/pieces can be moved and depositedcan be moved and deposited
Sediment BudgetSediment Budget is the balance of is the balance of eroded and deposited materialeroded and deposited material
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Coastal LandformsCoastal Landforms
Depositional LandformsDepositional Landforms– BeachesBeaches– Barrier Islands/LagoonsBarrier Islands/Lagoons– SpitsSpits
Shorelines of SubmergenceShorelines of Submergence– Fjorded CoastsFjorded Coasts– Wave-Cut Cliffs and PlatformsWave-Cut Cliffs and Platforms– Marine TerracesMarine Terraces
Coral CoastsCoral Coasts
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BeachesBeachesAn exposed deposit of loose sediment adjacent to a body of water
Backshore: landward of HWL
Foreshore: zone of tidal rise & fall
Offshore: zone always underwater
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Barrier Barrier IslandsIslands
Long narrow sandbars built up in shallow offshore water
Usually parallel to shore
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Barrier Islands Barrier Islands and Lagoonsand Lagoons
Water is isolated between barrier islands and main land
Eventually merge with barrier and mainland if sediment deposit not interrupted
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SpitsSpitsLinear deposit attached to land at one end and extending into open water in down current direction
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Coral CoastsCoral Coasts
Great Barrier Reef, Australia
In tropical oceans, most continents and islands are fringed with coral reefs
The coral is composed of polyps – tiny marine animals
They secrete external skeletons of calcium carbonate
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Fringing Fringing ReefsReefs
Attached to the coast of volcano
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Barrier Reefs and AtollsBarrier Reefs and Atolls
Atoll is a ring shaped coral structure surroundig a landless lagoon
Usually just at sea level
Barrier reef is aging fringe reef
Volcano is sinking and lagoon forms between reef and volcano
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Coral Reefs of the WorldCoral Reefs of the World