GPHY 103 Lecture Notes - Lecture 9: Artesian Aquifer, Underground Storage Tank, Hydraulic Head
18 Dec 2016
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Document Summary
Aquifers can vary greatly in scale; small or large. Ogallala aquifer in the great plains of the us covers many thousands of km2. Grace nasa programme; measured changes in the earth(cid:495)s gravitational field; more water in subsurface changes earth(cid:495)s gravity field in that area, which can be interpreted by satellites to find the rate of change of storage in aquifers. Can determine loss or gain but not total level. Greatest changes in himalayas and middle east, as well as. Ogallala aquifer spans texas to nebraska and idaho; central to the us. Recharge rates: may have accumulated over several thousand years. In large aquifers, groundwater may originate from a long distance away: extensive removal of groundwater may exceed the recharge rate, so it(cid:495)s called groundwater mining (consumption of non-renewable water) Aquifer stress; correlates with aquifer storage loss. Can be human-dominated; increase in demand, diminished water quality. Drainage, recharge and artesian zone (3 zones of the aquifer).
