EARTHSC 1G03 Lecture Notes - Lecture 25: Oxbow Lake
19 Apr 2017
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Document Summary
Energy (velocity) required to erode a particle is greater than that required to keep it in suspension: very fine particles require high velocities to be eroded due to electrostatic forces. Building dams causes a new base level to form upstream of the dam. Eventually, sediment must be dredged to continue using the dam: naturally, this sediment would make its way to the ocean, but this is not the case with man-made dredging, as a result, this leads to smaller deltas. Drainage patterns: dendritic flat layers, uniform composition, trellis folded or tilted strata, rectangular follow joint patterns often in metamorphic and igneous rocks, radial from volcanic structures. Alluvial fan: fast-moving stream (from mountains) empties onto a plain, water slows down and sediment deposited, vs. delta, which happens at true base level. Braided streams: channels constantly in motion as they are choked by the sediment load and new channels are established.
