What is it?
Transient flow (or unsteady flow) occurs when the magnitude or direction of the groundwater flow velocity changes with time.NOTE that you should NOT enable this feature (check this nbox) when performing particle tracking / contaminant transport on a steady flow field . You may still adjust the time-step for particle tracking / transport if the "box" next to Modeling Transient Flow is unchecked.
How to use it:
To perform unsteady (transient) modeling in IGW-NET, check the box next to ‘Transient’ in the upper-right part of the Default Parameters and Options Menu. Required inputs are the start date and time (hour of the day), the time step, and the simulation length. Use the texts boxes next to ‘State Date’ (year, month, day), ‘Hr’ (hours), ‘Time Step:’ (days), and ‘Simulation Length’ (days) to define user inputs.Multiple Time-steps
Use this option (check this box) to utilize variabale time-steps during the groundwater simulation.Save TimeStep-images
Use this option (check this box) to save the model results (plan-view display) for all (or some) simulation time-steps. The results/images can then be used to easily create a video using the HSA Video Maker tool (Other Tools > Utilities > MakeVideo).Two options are available for saving the time step images:
1) save to your Local browser memory buffer
2) save to your IGW-NET Server user folder
Note that only one set of time step images may be saved to your browser memory buffer or MAGNET4WATER server account, so re-simulating your model will overwrite your previously saved time step images.
By default, images will be created at each time step. To skip every-other time-step, enter a value of 2 in the text field next to 'Skip' ; to skip two-steps, enter a value of 3; and so on.