SMS:PTM Arc Attributes Dialog

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Feature arcs created in a PTM type coverage can be used to create either sources or traps.

Feature Object Attributes dialog for a Source Arc

Feature Object Attributes dialog
Feature Object Attributes dialog for a source Arc
  • Type – The selected option will determine which options are available. Options include; "Generic", "Horizontal Line Source", and "Horizontal Line Trap".
  • Source ID – Used to give multiple source arcs differing IDs so that multiple sources can be tracked.
  • Name – Field where a description for the source arc can be entered.
  • Show Coordinates in Spreadsheet – Toggling on this option will populate the spreadsheet below with coordinate columns.
  • Date/Time
  • Parcel Mass – Each parcel represents a specific amount of sediment. Combined with the rate PTM computes the number of parcels being tracked. When a specific quantity of material is being generated by a dredge or other source, this amount allows the tracking of all of that material.
  • Radius – PTM will distribute the parcels generated for this source randomly along the line. The position will also vary around the line within this specified radius.
  • Rate – A specific quantity of sediment will be generated based on this rate. The longer the line, the more sediment is added to the flow field.
  • Median Grain Size – This is the d50 of the sediment being added.
  • Standard Deviation – This phi unit defines how the grain size varies from one parcel to the next.
  • Density – This is the density of the sediment. This can be reduced to the density of water to create neutrally buoyant particles.
  • Fall Velocity – This is the speed of descent of the particles. The shape of the particle influences this quantity. Entering a value of -1 tells PTM to compute this value.
  • Critical Shear Intiation – Specifies the shear values to initialize motion for this particle.
  • Critical Shear Deposition – The threshold for this particle to settle.

Feature Object Attributes dialog for a Trap Arc

Feature Object Attributes dialog for a Trap Arc
  • Type – The selected option will determine which options are available. Options include; "Generic", "Horizontal Line Source", and "Horizontal Line Trap".
  • Trap ID – Used to give multiple trap arcs differing IDs so that multiple traps can be tracked.
  • Name – Field where a description for the trap arc can be entered.
  • Trap Elevation
    • Bottom
    • Top
  • Trap Options
    • Open Trap (particles can leave trap)
    • Single Trap (Count particles once per simulation)
  • Trap End Point Locations
    • X1
    • X2
    • Y1
    • Y2

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