EFDC and other hydrodynamic models such as ECOM, CH3D, and DELFT3D all require 2D curvilinear orthogonal or Cartesian grids. CVLGrid has been designed as a tool to support the building of these grids quickly and effectively. CVLGrid has been used to produce very complex grids, such as the San Joaquin-Sacramento River Delta (below) and very large grids (>500,000 cells).
To make building a grid as simple and physically representative as possible, CVLGrid optionally loads background bitmap images, including georeferenced Google Earth images, to display maps of the model domain. CVLGrid can directly import JGW, TFW and other standard georeferenced images. It also provides tools to help you georeference any bitmap image for use in CVLGrid and EE.
Optimized for EFDC
As all EFDC models require 2D curvilinear orthogonal grids, this grid building tool has been optimized for use with EFDC+, EFDC_EPA, and EFDC_Hydro. Since CVLGrid is an integrated part of the EE Modeling System, it makes the grid building process faster and allows you to iterate and make edits easily.
Grid Creation Tools
Once you have your background images/overlay files displayed, CVLGrid has a range of tools to create your grid. Using the georeferenced data, you build a series of discrete blocks then connect them each in turn, building your grid. Grid resolution, IJ orientation, orthogonality, etc are all available to iterate on as needed. Extensive Undo/Redo capability is extremely useful during grid building.
Grid/Model Import Tools
CVLGrid allows you to import grids from existing models such as practically any legacy EFDC model, ECOM and CH3D models. Once imported, you can edit and refine the grid and save the revised grid out as a new EFDC+ model or in the native CVLGrid grid format.
You can import, export, and edit a variety of third party overlay and land boundary files to help visualize your model domain and guide you during the grid building/editing process.
Some of the third party files that are supported include RGF Grid, AutoCad DXF files and ESRI Shape files.