Day 15 - Streams and Glaciers.pdf

Day 15 - Streams and Glaciers.pdf - Hydrologiccycle...

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STREAMANDGLACIALPROCESSES Hydrologiccycle Howstreamsand glaciersmodifyEarth s surface
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WhatAreTheRelationshipsBetweenSurficial Processes? Weathering Masswasting Stream Glacialprocesses Coastalprocesses →LANDSCAPEDEVELOPMENT Groundwater processes processes
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TuesdaysActivity(5) – Reviewof landforms VirtualFieldtrip Beforethelecture: DownloadGoogleEarth PlaywithGoogleEarth– itsfun! OnTuesday: wewillusetheVirtualFieldtripWorksheetto guideyouthroughaseriesoflandformsand featurescreatedbythesurfaceprocesseswehave justlearntabout. DownloadtheVirtualFieldTripStops‐ .kmz file fromtheConnectfolder(availablenow) Bringyourlaptoptoclass!!
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STREAMANDFLUVIALPROCESSES
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LearningGoals Studentsshouldbeableto: Explainthehydrologiccycle Describethecharacteristicsofstreams Explainhowstreamprocessesshapelandscapes Relateenergyofstreamsandriverstothe sedimentloadandrelatedsedimentarydeposits Summarizefactorsthatcauseiceages Explainhowglaciersform Discusstheconceptsgoverningtheflowof glaciers Recognizelandscapefeaturesformedbyabrasion ordepositionbyglaciers
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TheHydrologicCycle Plummer et al., (2012) Figure10.1
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TheRockCycle Weathering, erosion and transport of material from the mountains to the ocean – recycling of minerals into new rocks
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WhyAreStreamProcessesImportant? Streamserode,transport,anddepositsediment→ formlandscapes Streamsdo‘work’,dependingon: Discharge Q(m 3 /s) Velocity V(m/s) Area A(m 2 )
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Plummer et al., (2012) Figure10.7
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ClickerQuestion?? Imagine a fast flowing mountain stream with a velocity of ~100 cm/s. It will be….? A)Transporting clay B)Transporting gravel C)Eroding sand D)Depositing gravel E)All of the above
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HowDoStreamsErode? Dissolution Hydraulicfracturing Abrasion Plummer et al., (2012) Figure10.13
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HowDoStreamsTransportMaterial? Bedload Streamstransportloadinthreeways: Dissolvedload Bedload
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HowDoStreamsGetEnergy? Streamsgetenergyfromslopeanddischarge A= graded (equilibrium)streamprofile+baselevel Streamgradient(m/kmorft/mile) variesalongprofile Baselevel Q=1m/sX10m 2 =10m 3 /s Q=0.1m/sX10m 2 =1m 3 /s m km Plummer et al., (2012) Figure10.2
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ClickerQuestion?? Imagine a fast flowing mountain stream with a velocity of ~100 cm/s flows out of the mountains into a shallow basin. The slope decreases and the flow velocity also decreases rapidly to 10 cm/s. What is the dominant size of sediment that will be deposited….. A)Clay B)Silt C)Sand D)Gravel E)All of the above
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