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TRIM Training

TRIM Training. Day 1 Introduction and Overview of Model February 18, 2002 Mark Lee MCNC/Environmental Modeling Center http://www.emc.mcnc.org. Basic TRIM Terms. Volume Element Parcel Compartment Compartment Type Link. Volume Element. 3-D Defines the location of compartments

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TRIM Training

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  1. TRIM Training Day 1 Introduction and Overview of Model February 18, 2002 Mark Lee MCNC/Environmental Modeling Center http://www.emc.mcnc.org

  2. Basic TRIM Terms • Volume Element • Parcel • Compartment • Compartment Type • Link

  3. Volume Element • 3-D • Defines the location of compartments • Typically referred to by its primary abiotic compartment type • Values for its properties are NOT defined in the library; must be provided by the user in the scenario

  4. Parcel • 2-D • Used to subdivide the modeling region into volume elements • Only used in the volume element import file

  5. Compartment • Exists within a volume element • Chemical mass is homogeneously mixed within a compartment • In TRIM, chemical mass can only be transported between compartments or transformed within a compartment • May be abiotic (e.g., surface soil, air, surface water) or biotic (e.g., mallard, cow, fish) • Defined within a scenario

  6. Compartment Type • A specific type of compartment • Compartments of the same type are distinguished from each other by their location (i.e., the volume element containing them) and sometimes by the values of their properties • Defined within a library

  7. Link • A connection that allows the transfer of chemical mass between two compartments • Some links (e.g., between surface water or surface soil compartments) have properties whose values must be provided by the user • Defined within a scenario

  8. Graphical User Interface (GUI) Terms • Object • Property • Project • Scenario • Library • Algorithm • Composite Compartment

  9. Object • Any element in TRIM that has properties • Includes: scenario, source, chemical, compartment, composite compartment, volume element, link, or algorithm

  10. Property • A characteristic of an object in TRIM • Examples • outputDirectory is a property of a scenario • top is a property of any volume element • emissionRate is a property of a source • A property that stores data of type Real Number can come in several different "forms", such as: • "Constant Real Number" (a singular value) • "Unevenly Time Stepped Real Number" (a sequence of real values with associated dates and times), • "Unevenly Time Stepped Real Number from File" (a sequence of real values with associated dates and times contained in an external file), or • Formula Real Number (a mathematical formula that can include references to other properties in this or other objects).

  11. Project • Central element of a TRIM simulation • Includes scenarios and references libraries

  12. Scenario • Combines information from the library with site- and simulation-specific information to create a simulation • When a user performs a TRIM.FaTE simulation, they are actually running a scenario • Exists within a project

  13. Library • Contains the properties of the sources, chemicals, compartments, composite compartments, and algorithms • The property values of these objects may be changed in the scenario, but they must be created in the library to be included in a scenario • Changes to property values in a scenario do not change the values in the library

  14. Algorithm • A set of properties used to describe a process that transports chemical mass between two compartments or transforms chemical mass within a compartment • Algorithms exist on links

  15. Composite Compartment • A compartment comprised of a group of compartment types • Currently composite compartments are only used for plants • When setting up a scenario, users add a composite compartment to a surface soil volume element if they want to include plants • There are currently four types of composite compartments, each comprised of leaf, leaf particle, stem, and root compartment types: • Agricultural • Grasses/herbs • Deciduous forest • Coniferous forest

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