EESA01H3 Lecture Notes - Lecture 6: Vapor Pressure, Evapotranspiration, Aquifer
14 Dec 2015
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Ees - lecture 6- water and intro to soils. When measuring runoff, it becomes a depth. Most water leaves any system through evaporation or transpiration. Evaporation - have a pond or mud puddle with water that goes up. Transpiration - movement of water back into atmosphere from plants (plant facilitated evaporation) Key controls (on how much water is evapotranspirated: energy. Latent heat flux - energy needs to break hydrogen bonds to change state of water (to make water vapour so it can evaporate) Biggest source of energy is the sun: gradient in vapour pressure. Function of how much water vapour is in the air. If there is a lot of pressure in the air then we feel that as humidity. The vapour pressure right above a pond or whatever is saturated vapour pressure. Denoted 100% relativity - the amount of vapour pressure according to the temperature is at how much it can generally hold and low pressure in.
