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Transient Simulations require:

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MODFLOW divides time into Stress Periods. There are multiple time steps in a stress period. Initial t Selecting the time step Can use: t = Sa2/4T for ... – PowerPoint PPT presentation

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Title: Transient Simulations require:


1
Transient Simulations require
  • Initial Conditions
  • Storage Coefficient
  • Time step

2
Types of Initial Conditions
  • Static steady state
  • Dynamic steady state
  • Dynamic cyclic conditions
  • (Time distant conditions)

3
  • MODFLOW allows for two types
  • of storage coefficients
  • Unconfined storage coefficient (i.e., specific
    yield)
  • Confined storage coefficient

4
A convertible layer in MODFLOW (laycon type
3) is one where cells can convert from confined
to unconfined conditions (and back again to
confined).
5
MODFLOW divides time into Stress Periods. There
are multiple time steps in a stress period.
Initial ?t
Parameters in the following packages can be
changed with stress periods WEL, RCH, RIV, DRN,
EVT, GHB
Rule of thumb take at least five time steps per
stress period.
6
MODFLOW divides time into Stress Periods. There
are multiple time steps in a stress period.
Initial ?t
Rule of thumb take at least five time steps per
stress period.
7
Selecting the time step Can
use ?t Sa2/4T for the initial time step of a
stress period or find an appropriate time step by
trial and error.
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