Jump to content
GMS, SMS, and WMS User Forum

transient model MT3D


Recommended Posts

Hello everybody

I'm trying to generate a transient MT3D model within a transient Modflow model, I am getting some troubles obtaining the transient time steps that i would like as same as of my transient flow time steps,

i am using 48 time steps in my modflow model, but when I'm getting the results the MT3D gave me only 1 time step

it is possible to calibrate this transport model somehow?, because i have no idea about the initial concentrations but i know the area where the contaminant comes from; i know only concentrations observed in some observation points, how could i approach this issue?

Thanks a lot to whom would give me a light in this case.

have a nice day


Link to comment
Share on other sites

I am not sure what is happening with your MT3D time steps. With a transient MODFLOW model the MT3D stress periods and timesteps must match the MODFLOW stress periods and time steps. MT3D also has something called a transport time step. MODFLOW time steps will usually be subdivided into these transport time steps.

It is possible to calibrate the transport model. You can enter observed concentrations at observation points and then adjust model inputs to improve the fit. One approach is to estimate the initial input concentration and track that forward in time. As you calibrate the model you may adjust the initial input concentration.

Link to comment
Share on other sites

hello Alan,

thanks a lot for your tip, i'm trying without any success, i don't not why mt3d does not use the same time steps as in modlfow, instead generates me only few transport time steps

ill be sending you today another question.

thanks in advance for you help.


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...