ERTH 2415 Lecture Notes - Lecture 19: Flood Barrier, Flood Mitigation, Flow Velocity
27 Mar 2018
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Document Summary
Hydrologic cycle 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 -> infiltration, more infiltration, less flooding hazard. Hydrologic cycle transpiration: water is a critical element for photosynthesis, plant absorb liquid water by their roots, leaves release water vapour through transpiration. Hydrologic cycle 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, most abundant volcanic gas. Infiltration runoff: ----increasing soil porosity, ----increasing vegetation cover, ----increasing duration of precipitation. Drainage basin: area of land that convey all runoff into a particular body of water, largest drainage basins. In canada: hudson bay basin: drainage basin acts as a funnel, evacuating water to a single outlet, hierarchy, subtributaries, tributaries, main channel, depending on topography and geology, different styles of river networks develop.
