GEOL107 Lecture Notes - Lecture 15: Rain Shadow, Ferrari 250, Wind Speed
18 Oct 2018
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Document Summary
Features (both erosional and depositional) formed by wind. Areas with average annual precipitation of less than 250 mm per year (10 in), or areas where more water is lost by evaporation and transpiration than falls as precipitation. Most deserts created by 2 major factors: Precipitation falls on one side of mountain range. Only at highest wind speeds (>100km/hr) is competence of wind high. Capacity of wind high only for dust-sized particles. Even though ice is best transport agent, water is most important transport agent. Wind blows across surface, removing smaller-sized (primarily sand- and dust-sized) particles. Formed by deflation - surface layer primarily formed of larger- sized loose rock material and particles by wind deflation. Sand moves across surface, eroding it away. When wind slows down, competence is lower. Two major types of deposits due to wind: Long, wavy ridges that lie transverse (perpendicular) to wind.
