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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

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
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


Parcel
Parcel

  • 2-D

  • Used to subdivide the modeling region into volume elements

  • Only used in the volume element import file


Compartment
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


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


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


Graphical user interface gui terms
Graphical User Interface (GUI) Terms

  • Object

  • Property

  • Project

  • Scenario

  • Library

  • Algorithm

  • Composite Compartment


Object
Object

  • Any element in TRIM that has properties

  • Includes: scenario, source, chemical, compartment, composite compartment, volume element, link, or algorithm


Property
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).


Project
Project

  • Central element of a TRIM simulation

  • Includes scenarios and references libraries


Scenario
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


Library
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


Algorithm
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


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


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