Specialized Post-processing Tools

EFDC_Explorer provides a number of specialized tools to allow the user to post-process the output from the model. These include habitat analysis tools to quantify the habitat for fish and other aquatic organisms, as well as forced evaporation tools to quantify the impact of heated receiving water on evaporation.

Fresh water fish often occupy complex habitat with rapidly varying depth and velocity.

Habitat Analysis with Critical Limits Time Series

Habitat models are designed for a wide variety of planning applications where habitat information is an important consideration in the decision-making process. EEMS now supports a critical limits times series habitat analysis. The user may define up to five different parameters for the critical limits. These can be selected from any parameter that is currently activated in EE. The time series plots present a composite time series of velocity and the volume and area that meet the criteria.

Habitat Suitability Analysis with Instream Flow Incremental Method (IFIM)

IFIM models provide an objective, quantifiable method of assessing the existing habitat conditions for a given aquatic species within a study area by measuring how well each habitat variable meets the habitat requirements of the species by life stage. IFIM is one of the most widely used instruments in the world for assessing the effect of flow manipulation on river habitats. USA EPA describes IFIM as a state-of-the-art tool. A major component of IFIM is a collection of computer models called the Physical Habitat Simulation Model (PHABSIM). This model incorporates hydrology, stream morphology, and microhabitat preferences to determine relations between streamflow and habitat availability. EEMS now serves as a highly advanced 3D PHABSIM.

Weighted Usable Area vs Discharge for Burbot Fish Species

Forced Evaporation

Forced evaporation is defined as the additional evaporation due to increased temperatures in the receiving waters from the discharge of heated cooling water. Forced evaporation is being considered by federal and state agencies as a consumptive use for thermal electric power plants. EE serves as a toolbox to provide spatial and temporal evaluations of forced evaporation.