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Lecture Notes for ESS 110 - Hydrology and Climate at UC-Merced (UC Merced)

Notes Information

Material Type:Class Note
Professor:Staff
Class:ESS 110 - Hydrology and Climate
Subject:Earth Systems Science
University:University of California-Merced
Term:--
Keywords:
  • Confined Aquifers
  • Unconfined Aquifers
  • Secondary Effects
  • Porous Medium
  • Unconfined Aquifer
  • Substituting
  • Definitions
  • Special Case
  • Continued...
  • Exploitation
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Sample Document Text

  EnvE/ESS 110, Hydrology and Climate  1 1.  Specific Storage  The specific storage  s S  of a saturated aquifer is defined as the volume of water that a unit volume of aquifer  releases from storage under unit decline in hydraulic head () sww SVVh=??.  We know that a decrease in  hydraulic head infers a decrease in fluid pressure ()hp?? =?  and an increase in effective stress  () e h ? ??=?? .  The water that is released from storage under conditions of decreasing h  is produced by two  mechanisms: (1) the compactions of the aquifer caused by increasing  e ? , and (2) the expansion of the water  caused by decreasing  p .  The first of these mechanisms is controlled by the aquifer compressibility ?  and the  second by the fluid compressibility ? .    (1)  Let us first consider the water produced by the compaction of the aquifer.  The volume of water expelled  from the unit volume of aquifer during compaction will be equal to the reduction in volume of the unit volume  of aquifer.  The vo...

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