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TRIM Training. Day 1 Introduction and Overview of Model February 18, 2002 Mark Lee MCNC/Environmental Modeling Center 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

TRIM Training

Day 1

Introduction and Overview of Model

February 18, 2002

Mark Lee

MCNC/Environmental Modeling Center

basic trim terms
Basic TRIM Terms
  • Volume Element
  • Parcel
  • Compartment
  • Compartment Type
  • Link
volume element
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
  • 2-D
  • Used to subdivide the modeling region into volume elements
  • Only used in the volume element import file
  • 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
compartment type
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
  • 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
graphical user interface gui terms
Graphical User Interface (GUI) Terms
  • Object
  • Property
  • Project
  • Scenario
  • Library
  • Algorithm
  • Composite Compartment
  • Any element in TRIM that has properties
  • Includes: scenario, source, chemical, compartment, composite compartment, volume element, link, or algorithm
  • 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).
  • Central element of a TRIM simulation
  • Includes scenarios and references libraries
  • 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
  • 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
  • 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
composite compartment
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