ERTH 2415 Lecture Notes - Lecture 9: Outburst Flood, High High, Flash Flood
28 Aug 2018
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Document Summary
Hydrologic cycle: describes the constant exchange of water between ocean, atmosphere and continents, energy derived from the sun, water is a key factor in several geological processes. Change in clay behaviour, dissolution of limestone to form sinkholes, etc: processes involved in the hydrologic cycle, evaporation and precipitation, runoff and infiltration, transpiration, sedimentation and volcanism. Runoff and infiltration: what paths does water take after precipitation on land, a portion flows across the surface into streams -> runoff, a portion soaks into the ground -> Volcanism: water incorporated into marine sediments, sediments are transported on subducting plates, water lowers the melting point of rock, water is expelled as a volatile during volcanic eruptions. Surface water: statistics: total volume of water on earth = 1. 36 billion km3, 97. 20 % seawater, 2. 15 % glacier ice, 0. 62 % ground water, 0. 03 % surface water, 0. 0001% in rivers and streams.
