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Overview of Transient Simulations in MODFLOW with Initial Conditions and Time Steps

This information provides an overview of transient simulations in MODFLOW, focusing on the requirements for initial conditions, storage coefficients, and time steps. It discusses static, dynamic steady-state, and dynamic cyclic conditions, as well as the two types of storage coefficients: unconfined (specific yield) and confined. The concept of convertible layers (laycon type 3) is introduced, allowing for changes between confined and unconfined states. Furthermore, the importance of stress periods and proper selection of time steps for accurate simulation results is emphasized, along with practical guidelines for initial time step choices.

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Overview of Transient Simulations in MODFLOW with Initial Conditions and Time Steps

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  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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