8. Rivers and Floods

8. Rivers and Floods - Rivers and Floods all part of the...

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Rivers and Floods all part of the hydrologic cycle USC Earth Sciences Geol 108 (Anderson)
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Why Important Balance of nature sediment source for beaches soil nutrition wildlife Source of fresh water Floods - we live on floodplains flat land, nutritious soil, water availability, water  transport (1/8 trucking , 2/5 train costs) From New Orleans to Pittsburgh to Sacramento -  all below flood level
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Issues Superfloods – circa 100 year cycle Levee breaks – point source of 1000 miles of flood waters Beaches and barrier islands – disappearing Why: due to dams and channeling of rivers (for shipping to deep  waters) They are barriers against hurricanes!
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Water on Earth
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Downstream Changes Longitudinal Profile base high on profile:  erosion >> deposition Changes downstream : width (>), depth (>), velocity (>),   discharge = w*d*v  (>) low on profile:  erosion = deposition ,  except during floods
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This note was uploaded on 02/06/2011 for the course GEOL 108Lg at USC.

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8. Rivers and Floods - Rivers and Floods all part of the...

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