Sedimentation_horizon
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Data Structure: Sedimentation_horizon |
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Data structure for each sedimentation horizon |
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Sedimentation_horizon NUM=ival where ival is the data structure number |
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Overview The Sedimentation_horizon data structure defines the topology of a horizon to be used to define the sedimentation of a new stratigraphy layer. The horizon is defined as a faceted surface; i.e. 2-noded facets in 2-D, 3-noded facets in 3-D. The node numbering and coordinates defining the faceted surface are defined in the data structure and do not form part of the nodes in the mesh. The horizon may be defined as either stationary or moving; e.g. increasing in elevation or prograding, via displacement component magnitudes and a time curve. In 3D simulations the sedimentation horizon topology may be defined via part geometry by defining Type "Part_geometry" and using the keyword Geometry_part to assign the corresponding Part_geometry_set .
Notes •A sedimentation horizon may be used for deposition of multiple stratigraphy layers if a displacement is specified. •Several sedimentation horizons may be specified if required. •When a Part_geometry_set is used to define a Sedimentation_horizon , and the user aims to overwrite the location of the sedimentation horizon at a given stage (e.g. defining a higher elevation than in previous stage) all the data defining the sedimentation horizon will need to be re-specified (e.g. Sedimentation_horizon , Part_geometry_set , Part_surface and Part_nodal_data ).
Examples demonstrating the usage of sedimentation_horizon include: •dep_2d3n_002.dat •dep_2d3n_003.dat
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 | Name Sediment horizon name |
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Defines the sediment horizon name (maximum 64 characters).
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| Type Sediment horizon type |
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Defines the sediment horizon type where the valid types are:
• "Facet" - Faceted description (default). The horizon geometry can be defined using Facet_topology and Coordinates (2D and 3D) or Geometry_part (3D only). If defined with the latter, ParaGeo will convert the part geometry into facets. • "Part_geometry" - Where the part geometry describing the horizon is defined using Geometry_part. • "Plane" - Where the deposition surface is defined as a plane surface which may be either horizontal, with initial elevation defined by Reference_elevation or inclined, by additionally specifying Coordinate_system and Reference_location which is defined via the Sedimentation_data data structure.
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| Facet_topology List of facets defining horizon |
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Defines a list of facets defining the horizon. The facets are 2-noded lines in 2-D and 3-noded triangles in 3-D. The topology numbering is local to the horizon starting at 1. If more than one sedimentation horizon is defined both should have a topology starting at 1. This is in order that the second definition does not overwrite the first definition.
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| Coordinates Coordinates defining horizon |
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The coordinates of each node are defined in order from 1 to Nnodes, where Nnodes is the total number of nodes defining the sedimentation horizon.
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| Displacement Horizon displacement |
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Defines the reference displacement magnitude for each displacement component (X and Y in 2-D, X,Y and Z in 3-D).
Notes •The keyword Time_curve must be specified in conjunction with Displacement in order to define the displacement rate for the sedimentation horizon. •If the Sedimentation_horizon type is "Part_geometry", Displacement cannot be used. Part_nodal_data and Part_nodal update defining the current and final positions of the sedimentation horizon together with a Time_curve assigned to the Part_geometry_set must be used instead.
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| Time_curve Time curve number |
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Defines the time curve number to be used in conjunction with the reference displacement (defined via Displacement ) to define the movement of the sedimentation surface.
Notes •If the Sedimentation_horizon type is "Part_geometry" displacement cannot be used. Part_nodal_data and Part_nodal update defining the current and final positions of the sedimentation horizon together with a Time_curve assigned to the Part_geometry_set must be used instead.
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| Geometry_part Part geometry to be used as sedimentation horizon |
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Geometry_part defines the name of the Part_geometry_set used to define a sedimentation horizon. Currently this option is only available in 3-D.
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| Reference_elevation Reference elevation for a horizon plane |
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Reference_elevation specifies the reference height of a horizon plane at a Reference_location that, if specified in conjunction with Displacement, defines the sedimentation surface. By default the horizon plane is horizontal but it may be tilted by assigning a Coordinate_system and defining a reference location, via Reference_location specified on the Sedimentation_data structure. In this case the plane is defined with the reference elevation at the reference location.
Notes •Currently this option is only available in 3-D. •The data is only used if the horizon type is "Plane".
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| Coordinate_system Coordinate system number |
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The Coordinate_system keyword is used to assign a coordinate system to a sedimentation horizon to define an inclined sedimentation plane. The data is only used if the horizon type is "Plane".
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