April 14_2008 - b. Meanders i. Bend in a river. 1. Forms...

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River Systems I. Stream a. Def: channelized flow of water. i. Size not distinguished ii. Erodes continental crust iii. Carries water and sediment from continent to sea 1. Base level a. Lowest level to which a stream can erode the crust. b. Usually sea level 2. Temporary base level a. A lake b. Gradient/slope of stream bed i. Measure of vertical change over horizontal distance of a stream. ii. Long profile 1. Measure of a streams entire gradient. 2. All streams want the same profile from start to finish. a. Shorten profile i. Deposition b. Lengthen profile i. Erosion 3. Discharge a. Q =WD(VEL) b. w=m, d=m, vel =m/time, q=m 3 /time II. Stream erosion a. Channel pattern i. Dendritic pattern
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1. Tree-like 2. Homogenous soil/rock ii. Radial 1. Flows away from a central high point. 2. Like spokes on a wheel iii. Rectangular 1. River flows at right angles 2. Caused by faults/fractures in the ground iv. Trellis 1. Smaller tributaries are parallel. 2. More resistance rock layers keep smaller rivers parallel until flow into main channel.
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Unformatted text preview: b. Meanders i. Bend in a river. 1. Forms because the water flows in spiral (corkscrew) pattern. c. Waterfalls i. Free fall of water over a shear cliff. ii. Niagara 1. Lockport dolomite 2. Rochester shale III. Stream load a. Dissolved load i. Ions in solution ii. Deposited when chemicals of H 2 O changes b. Suspended load i. Finer particles ii. Large drop in velocity causes deposition. c. Bed load i. Larger particles ii. Small drop in velocity causes deposition IV. Depositional features a. Floodplain i. Area next to a steam inundated with water when a steam overflows its banks. b. Natural levees i. Build up of sediment next to a stream channel c. Terraces i. Abandon floodplain ii. Formed when a stream erodes to a level below existing plain. d. Deltas i. Deposit of sediment into a standing body of water. e. Fans i. Stream deposits that accumulate in dry basins, at the base of mountains....
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This note was uploaded on 04/23/2008 for the course GEOLOGY 101 taught by Professor Wareham during the Spring '08 term at CSU Fullerton.

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April 14_2008 - b. Meanders i. Bend in a river. 1. Forms...

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