Webinar: MODFLOW-USG: Theory, Application, and Implementation of CLNs

MODFLOW-USG was first released in 2013 by the USGS as an alternative version of the popular MODFLOW groundwater modeling software, that provided flexible gridding capability as compared to the previous standard finite difference versions. The concept of Connected Linear Networks (CLNs) was introduced in MODFLOW-USG to provide a mechanism for the inclusion, in a groundwater flow model, of any 1-D hydrogeologic or hydrologic water feature that is much smaller than the size of the model cell encompassing it. The CLN process, therefore, allows for the inclusion of features with much smaller cross-sectional areas than the model grid cell size without the necessity of having to refine the model grid cell size to the size of the CLN feature. CLN features may include pumping and monitoring wells (vertical, horizontal or angled); radial collector wells or adits; underground mine workings such as developments, ramps, and stopes; geologic complexities such as karst features or faulting; or surface-water bodies such as connected canals, rivers and stream channels. CLNs can also be used conceptually to connect different parts of a domain. Further developments on the CLN concept have been included in USG-Transport by GSI Environmental which adds simulation capabilities such as solute transport through CLN and groundwater flow domains, density dependent flow and transport, and various turbulent flow formulations. This webinar will review the capabilities and flexibility of using the CLN package in groundwater flow and transport simulations.

The webinar has been developed for better understanding and use of the CLN module. The course covers the theory, application, and implementation of CLNs in groundwater flow models. Specific topics that will be covered include:

·         History of MODFLOW & MODFLOW-USG
·         CLNs in MODFLOW-USG and USG-Transport – what CLNs can and cannot do
·         Demonstration examples
·         Compatibility / use of CLNs with other packages
·         CLN input parameters
·         Example workflow – Pre and post processing CLNs
·         Running models with CLNs
·         Pitfalls and troubleshooting strategies

This 2.5-hour webinar is developed and conducted by Dr. Sorab Panday who is the lead author of MODFLOW-USG and USG-Transport. It is the product of decades of experience in development and application of coupled flow and transport models at various scales, of practical approaches and issues encountered when incorporating CLNs in various modeling projects, and of realizing the need to better understand and apply CLNs in MODFLOW-USG and USG-Transport based on fielding support and troubleshooting questions from users.

The Webinar will begin at 2:00 p.m. Eastern Time on December 10, 2020. Cost for the Webinar is $250 per person. Please register all participants if you have multiple attendees that are conferencing from your office. Please click on the following link to register. Login details for the webinar will be emailed to you once you have registered.