Modeling

Models are used by engineers and scientists to understand physical processes, design engineering works, and predict future conditions. Most engineering modeling is accomplished using numerical models – computer-based solutions of mathematical equations that describe the main processes. We have used the Environmental Protection Agency’s HSPF model for watershed rainfall-runoff analyses and EFDC model for three-dimensional hydrodynamics, sediment transport, and water quality studies. We led the team that developed the Corps of Engineers TABS models and graphical interface system, which has been subsumed into the Surface Water Modeling System (SMS). We use the Corps’ ADH multi-dimensional hydrodynamic and sediment transport model and other models as needed for specific projects. We have applied physical and numerical models to numerous water bodies in the U.S., including most of those listed in our Project Locations. Typical projects include our modeling of:

 

• The lower 50 miles of the Columbia River estuary with both a physical (scale) model and a TABS-2 numerical model to evaluate sediment management alternatives. Tested plans included construction of an artificial island from dredged material in order to provide habitat for endangered bird species and jetty improvements to reduce entrance channel sedimentation.

 

• Atchafalaya Bay with a number of models and desktop techniques to predict delta morphologic growth, water quality, and flooding in Atchafalaya Bay for 50 years into the future with and without management plans.

 

• Lakes Pontchartrain and Borgne and the adjacent Biloxi Marshes using a 3-dimensional unsteady flow model to evaluate a range of freshwater diversions from the Mississippi River.

 

• Savannah River and Harbor for salinity intrusion and flushing as affected by a tide gate in Back River.

 

• A storm surge barrier in the Saugus River for evaluation of flood protection, navigation, and flushing.