# Shared Flashcard Set

## Details

Hydrogeology1
Flashcards for exam 1
14
Geology
10/28/2011

## Additional Geology Flashcards

Term
 Components of Hydraulic Conductivity(K)
Definition
 a function of rock & fluidInfluenced by:sediments: porosity, fractures, grain size, pore connectivity (permeability)fluid: type, temperature (dynamic viscosity & density)
Term
 Permeability(k)
Definition
 ability of a porous material to allow fluids to pass through it:porosity, fractures, grain size, pore connectivity of sediments etc.
Term
 Darcy's Law
Definition
 Q=-K dh/dl A
Term
 Potential Flow
Definition
 Flow always occurs from area of high values to lower values.Can define work required to mvoe mass form one location to a second location
Term
 Fluid Potential
Definition
 all work done on mass of interest to move from datum to P
Term
 What happens when you change grain diameter (d), density, and viscosity?
Definition
 increase d, increase space for flowincrease density, increase pressureincrease viscosity, decrease specific discharge
Term
 What is the density and viscosity of water, and the permeability of soil?
Definition
 density of water=1 g/cm^3±%viscosity of water=10^-3 Pa*s ± %permeability of soil=10^-12 m2 ±6 orders of magnitude (i.e. gravel: 10^-6, clay=10^-18
Term
 How and why permeability (k) changes
Definition
 homogeneous=>K or k is independent of positionHeterogeneous=>K or k depends on positionIsotropic=> K or k is independent of directionAnisotropic=> K or k depends on direction of measurement
Term
 What is Representative Elemental Volume? (REV)
Definition
 any piece of system that represents bulk volume behaviour
Term
 Define Specific Storage (Ss)
Definition
 Ss=1/fluid density *(dfluid density/dh)*dh/dlSs=>change in volume of fluid stored per unit volume of porous media per unit change in hydraluic head [units of 1/L]
Term
 What are teh two components of of Specific Storage (Ss)?
Definition
 uniaxial compressibility of porous media (cµ)bulk compressibility of fluid
Term
 Darcy's Law works in most porous media flows, such as:
Definition
 saturated flow [single fluid]unsaturated flow [multiple fluids]steady-state & transient systemsaquifer flow [very high K] & aquitard system [very low K]
Term
 How equipotential and stream surfaces relate to physical boundings?
Definition
 Equipotentials=> constant head (lakes, rivers, water level in well)Stream surfaces=>shales, clays, basement rock, concrete, steel sheets, other forms of boundaries to aquifiers. Consider stream surfaces because we assume no flow across them, only tangent to them.
Term
 Simplified Darcy's Law
Definition
 Q=mKH/n∆Q=flow in streamtubem=# of streamtubes across a flow netn=# of head drops across a flow netK=constant of proportionality=hydraulic conductivityH=total head drop
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