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# 2D Cross Sectional Model

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Greetings everyone,

I am somewhat new to GMS and have made my way through a number of the tutorials, but I am struggling with setting up a SEAWAT model. I want to create a 2D cross section of a coastal aquifer with the elevation of the top of the model decreasing from left to right, reaching 0 meters at the shoreline (MSL). I have a measured elevation profile (in .txt format) of the study area (X and Z). My question is how to set up a 2D cross sectional domain in the X and Z direction (Y would be 1 meter into the page). Is there a way to define the model domain in cross-sectional view using the conceptual approach, and import the X and Z data to define the top of the model? I suspect the scatter point tools will be used (Interpolate to->MODFLOW Layers) , but it seems not possible to define the model boundaries and boundary conditions in cross sectional view.

Thank you! ﻿

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Hi,

I think you could use the conceptual model approach. You need to think of your cross section model as a normal layered aquifer model, that has only a single row. Therefore everything has to be treated layer-wise. You need to follow the MODFLOW logic, there is no special case for cross section models. And you obviously need to add Y coordinate to your elevation dataset.

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There is a trick that could be used with MODFLOW. One could think of the Z coordinate as Y and model it as single layer model. But this is off the table for SEAWAT due to gravity vector orientation.

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Yes, the model would have to have one row in the Y dimension. Essentially the top of the model domain in map view will have to be a rectangle one cell wide (Y) by the length (X) of the cross section. Drawing such a domain and then assigning layer elevations and ibounds is not intuitive because it needs to be done in map view and it doesn't allow the user to modify the model in cross section.

Modeling the system in the X and Y dimension would not work because of density, as you noted.

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