runningwater

runningwater - Streams and Floods: The Geology of Running...

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Streams and Floods: The Geology of Running Water
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Landscape of a planet or moon without water: never changes. 3.9 b.y. Earth’s moon
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W. W. Norton Water into streams Hydrologic cycle
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W. W. Norton Sheetwash: thin, covers surface Downcuts: sheetwash becomes concentrated - erodes + scours out a channel Headward erosion: fastest downcutting at channel head channel ‘moves’ upslope tributaries form to feed new stream drainage network develops Small streams Larger stream
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Stephen Marshak Headward erosion
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How does the various geological materials effect the location and development of streams within a watershed?
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Downcutting vs. Wall Stability Hard/soft rock = stairstep valley Solid rock = narrow canyon Unstable walls = broad valley
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Streams - permanent or not? It all depends on the ' water table'
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W. W. Norton Types of drainage patterns 1. Dendritic like the veins of a leaf Flow over uniform surface Controlled by what the water flows over Dendritic drainage, Yemen
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W. W. Norton Types of drainage patterns 1. Dendritic 2. Radial Flow from center point – mountain or volcano Resembles wheel spokes Cotopaxi Volcano, Ecuador
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W. W. Norton Types of drainage patterns 1. Dendritic 2. Radial 3. Rectangular Controlled by grid of fractures as joints or faults Right angle joins Kevo, Finnish part of the Tana basin.
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W. W. Norton Types of drainage patterns 1. Dendritic 2. Radial 3. Rectangular 4. Trellis Form in long valleys Trunk stream cuts resistant ridges – water gaps
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Trellis drainage, Rio Paraná and Rio Tietê, Brazil
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W. W. Norton Catchment region – where does the rain go
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runningwater - Streams and Floods: The Geology of Running...

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