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Lecture

Lecture Feb 6.docx

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Department
Geography
Course
GEOG 1F91
Professor
Daryl Dagesse
Semester
Winter

Description
Feb. 6, 2014 Agents of Erosion • What can move weathered material? o Gravity (mass wasting) o Water (coastal/fluvial) o Wind (aeolian) o Ice (glacial) Causes of Slope Failure • Rainfall • Undercutting • Shocks or vibrations (traffic, earthquakes) • Loading on upper slopes (roads, buildings) Drainage Systems • Fluve = channeled water Text Fig. 15.13 • Drainage divide • Stream flow o Water always wants to channel o Adhesion + cohesion (sticks to things and itself) • Rills o Really tiny valleys • Gullies o Bigger valleys • Valleys o Biggest • Drainage basin (bowl shape) o Interfluves • Similarities between different drainage basins show similarities in: o Fluvial processes o Basin composition (chapter 14) • Types of patterns: (Fig. 15.14) o Dendritic  Normal o Parallel  Stretched dendritic (slope is steeper, water flows according to “arrows”) o Trellis  Similar to parallel, more cross-channels o R
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