EAS205 Chapter Notes - Chapter 11: Porosity, Clay Minerals, Phreatic
2 Apr 2016
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Only 0. 63% of the total water is groundwater, yet it is the most signiicant reservoir of liquid fresh water. Much groundwater is saline (either connate or made saline by it"s interacion with host sediments). The residence ime (capacity of reservoir/ low rate of addiions) of groundwater varies. Porosity: holes/ cracks in material, not illed by solid material. It is a measure of how much luid material can store. (the empty spaces can be occupied by liquid and by gas) Permeability: how luids pass through material. (it is related to porosity; the larger the pores, the faster the luids move). *porosity and permeability are both afected by the shapes and the sizes of mineral grains present. Igneous rocks and metamorphic rocks have low porosity and permeability. Clasic sediments (that are formed from loose paricles) contain more pore spaces, thus are permeable. (e. g. Clasic sediments that are more lat in shape, like clay minerals may be porous, but are not very permeable.
