Subsidence File

The format for sedflux subsidence files is different for the 2D and 3D versions of sedflux. In 2D mode, the subsidence file is a series of records that each contain a time value, and comma delimated data that define the subsidence curve. In 3D mode, the subsidence file is also a series of records that defines a time-varying subsidence curve but is binary.

2D subsidence file

The subsidence file in the following example contains two records that define the subsidence of the profile at 0 and 100 years. Each record begins with a header contained in square brackets followed by two columns of data that define how the profile subsides along its length. The time is given in years, the position (first column) in meters, and the subsidence rate (second column) in meters per year. For times between records, sedflux interpolates linearly between records.

[ Time: 0 ]    // Time of this record in years
0, 0           // Subsidence is zero at the origin
100000, -.2    //   and increases to -.2 m/y at 100km 

[ Time: 100 ]  // The second record is at 100 years
0,0
100000, -.1

If the file contains only one record, then the subsidence rate is held constant starting from the time indicated in the record header. If the model runs longer than the time of the last record, the subsidence curve is set to that of the last record for the remainder of the simulation.

3D subsidence file

The subsidence file for 3D sedflux, contains a series of binary records containing similar information as that of the 2D file described above.

The file begins with two 32-bit integers that define the size of the subsidence grid for each record. The first value is the number of rows and the second the number of columns.

Records are then listed one after another. Each record begins with a double value that gives the time in years of the record. The subsidence data then follows as double values written row by row. Subsidence values are given in meters per year.

Note:
The size of the grid must match exactly that of the grid that is defined in the bathymetery file.

The byte order of the file must be the same as that of the machine that the simulation will be run on.


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