15_streams_09_post

15_streams_09_post - 15: Surface Processes 2-Streams...

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eams: eams: 1 15: Surface Processes 2-- Streams Meadering Alaskan river. Photo: P. Kresan Braided streams in Alaska. Photo: G.M. Ashley Incised meanders,  San Juan River, Utah. Photo: T. Bean
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eams: eams: 2 Why this is important Streams are major component of the hydrologic cycle powered by the sun and gravity. Plate, p. 552
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eams: eams: 3 Streams carry most of the water that goes from land to sea, in the process transporting billions of tons of sediment. Iguaçu River, Brazil.  Photo: D. Nausbaum Why this is important
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eams: eams: 4 Running water is the most effective sculptor of the landscape. Incised meanders, San  Juan River, Utah. Photo: T. Bean Why this is important
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eams: eams: 5 Definitions   Stream : channeled  flow of water of any  size (river, brook,  creek are loosely  defined by size)    Channel : conduit for  carrying water   Floodplain : low- lying area  surrounding the  channel that is  normally dry but  may become  submerged during  high stream flows.
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eams: eams: 6 Water budget Fig. 17.2 Gains: rain, snow, melting snow; swamps and lakes; soil moisture; tributaries; upward-flowing groundwater; storm drains, sewage pipes Losses: evaporation, downward-flowing groundwater, pumping
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eams: eams: 7 Stream evolution Fig. 17.3 (a)  Sheetwash : overlapping  films or sheets of water  that move downslope  (think of water flowing  down a driveway) (b) Faster-moving sheetwash scours a channel. (c) Channel lengthens upslope by eroding at start of channel ( headward erosion ); secondary streams ( tributaries ) join the main stream to form a drainage basin
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eams: eams: 8 Stream evolution Fig. 17.3 Headward erosion in Canyonlands National Park, Utah.  Photo: R.W. Schlische
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eams: eams: 9 Drainage basins Fig. 17.4 Flat-lying strata of uniform lithology Isolated high 2 sets of fractures Valley & Ridge
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eams: eams: 10 10 Divides Drainage divide : ridge that separates one drainage basin from  another Fig. 17.5
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eams: eams: 11 11 Divides Fig. 17.6 Continental  divide : drainage  divide that  separates  streams that  drain into the  Atlantic Ocean  and the Pacific  Ocean
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eams: eams: 12 12 Divides Fig. 17.5 Continental  divide : drainage  divide that  separates  streams that  drain into the  Atlantic Ocean  and the Pacific  Ocean
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eams: eams: 13 13 Stream flow   Laminar flow channelized flow  paths are all  parallel to one  another   Turbulent flow irregular flow  paths, produced  in irregular  channels or at  high velocities Fig. 17.10
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eams: eams: 14 14 Stream transport   Dissolved load : high in humid climates (higher chemical weathering).  
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15_streams_09_post - 15: Surface Processes 2-Streams...

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