SMS:PTM Arc Attributes Dialog

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

File:PTM Feature Attribute Arc Source.jpg

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
• 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

File:PTM Feature Attribute Arc Trap.jpg

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
• 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

Related Topics

• PTM Sources
• PTM Traps