GEOG M109 Lecture Notes - Lecture 4: Semipermeable Membrane, Sodium Sulfate, Evapotranspiration
Document Summary
Extension of irrigation and application of new technology for water abstraction. Through evapotranspiration soil moisture content evaporates and salts are left behind. However, human activity (e. g. irrigation) on the soil moves salts to surface quicker (as opposed to evapotranspiration) by uprooting salt content to surface. Construction of large dams and barrages and irrigation channels. Saltwater (seawater) is heavy and can support less dense non-saltwater (freshwater) The more freshwater that is pumped, seawater will gradually (10 years) replace the imbalance of seawater-freshwater density ratio (40:41) As sea level rises, then we have 3 potential scenarios: If the land is high and the sea level rises, then a high pressure will force freshwater table upward toward the land with a balance of seawater-freshwater density. If land elevation is medium (not high enough to warrant the water table moves up fully) The water table cannot rise fully due to elevation limit.
