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Lecture15 - Streams and Flood Processes EARTHSS17...

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Streams and Flood Processes EARTHSS17 Catastrophes Lecture 15 Feb 13 2013
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RelaAve ProporAons of Meandering Streams
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Over thousands to millions of years, rivers carve out the valleys they flow in a) True’ b) False’
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Which river would have the highest gradient? a) Rivers’near’their’floodplains’ b) Rivers’near’the’ocean’ c) Rivers’in’gentle’valleys’ d) Rivers’flowing’into’dams’ e) Rivers’moving’down’mountains’
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Dynamic Equilibrium Cross-secAon & shape  Flow, sediment volume and grain size
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Mauldin Millsite, GA
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Braided Streams Eroding banks, abundant bed load, steep gradient § Broad,’mul=-channel’paths’ § Overloaded’with’sediment’ § Arid’climate,’li±le’ vegeta=on’protec=ng’ slopes’from’erosion ’ § Meltwater’streams’from’ sediment-laden’glaciers’ § Arid’Basin’&’Range’valleys’
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Braided Stream Wairou, New Zealand
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Fig. 12-12, p. 337 Hazard Areas of Alluvial Fans Copper Canyon, Death Valley
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Repeated Debris Flows and Flash Floods Venezuela 1999, 30,000 killed, 400,000 homeless $2 billion
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Bedrock Stream Shotover, New Zealand High-gradient’channels’ Deep,’narrow’cross-sec=ons’
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Fig. 11-13, p. 323 Colorado River, Grand Canyon, AZ Extreme turbulence whirlpool/vortex
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