EAS201 Lecture Notes - Lecture 22: Regolith, Viscosity, Porosity
20 Sep 2016
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Document Summary
Most h2o is in the ocean ~97. 5% Only 2. 5% of h2o on earth is fresh h2o. Dissolution, cementation, replacement, placer + other mineral deposits. Ground water: water contained in pores within bedrock or regolith. Porosity: percentage of rock that is pore space, and the amount of porosity depends on sorting and cementation. And for greater grain sizes and better sorting, higher porosity. Permeability: ease of fluid flow through porous medium. Depends on: pore size + connectivity + viscosity. Sand & sandstone & limestone & dolostone (in caves & karst) Sinkholes: formed by the collapse of the ground (eg. happened in. Recharge areas: where h2o goes into the ground. Discharge areas: where h2o flows from below to the surface. The closer to the surface the faster the motion (ranges from days to thousands of years) Unconfined aquifer when it has no cap (no aquiclude) (i. e. no low porosity stone that confines h2o motion)
