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[edit] Sedsim
Contents |
[edit] Metadata
| Modeler information | |
|---|---|
| First name | Cedric |
| Last name | Griffiths |
| Type of contact | Project manager |
| Institute / Organization | Commonwealth Science and Industrial Research Organisation |
| Postal address 1 | CSIRO Petroleum |
| Postal address 2 | ARRC, 26 Dick Perry Av. |
| Town / City | Kensington, WA |
| Postal code | 6151 |
| State | NO STATE |
| Country | Australia |
| Email address | cedric.griffiths@csiro.au |
| Phone | +618 6436 8784 |
| Fax | +618 6436 8555 |
| Model identity | |
|---|---|
| Model type | Modular |
| Spatial dimensions | |
| Spatial extent | |
| Model domain | |
| One-line model description | Sedimentary process modeling software |
| Extended model description | Sedsim models multigrain and carbonate erosion, transport and deposition/production at a very wide range of spatial and temporal scales. The output is produced in a testable form consisting of grainsize distributions, porosity, composition. |
| Model technical information | |
|---|---|
| Supported platforms | Unix, Linux, Mac OS, Windows |
| Other platform | |
| Programming language | Fortran90 |
| Other program language | |
| Code optimized | |
| Start year development | 1984 |
| Does model development still take place? | Yes |
| If above answer is no, provide end year model development | |
| Model availability | As teaching tool, As executable |
| Source code availability (Or provide future intension) | Through owner |
| Source web address | |
| Program license type | Other |
| Program license type other | binary annual or per cpu hr |
| OpenMI compliant | No but possible |
| CCA component | No but possible |
| IRF interface | No but possible |
| Memory requirements | 4 Gb |
| Typical run time | minutes to hours - depends on size and complexity required |
| Input - Output description | |
|---|---|
| Describe input parameters | Fluid flow locations (unlimited velocity, flow, sediment concentration and grain-size distributions for each location at each time interval), wave field, tidal current field, ocean current field, temperature field, salinity field, tectonic movement grid, crustal rigidity, carbonate and other organic optimum growth environment(s) |
| Input format | ASCII |
| Other input format | |
| Describe output parameters | Results are output at user defined intervals. All sedimentation and erosion that has occurred since the last output is accumulated together and can be presented as ascii files at any location, as maps, as isopleths, as volumes of any particular grainsize, seismic sections, well logs etc.. standard output is also as full 3D interactive visualisation volumes for Windows and Unix/Linux machines. |
| Output format | ASCII, Binary |
| Other output format | |
| Pre-processing software needed? | No |
| Describe pre-processing software | |
| Post-processing software needed? | Yes |
| Describe post-processing software | gd2cif - produces binaries for SedView
SedView - Python wrapper for OpenGL 3D visualisation Graph2Dep - produces ascii data for Eclipse, Petrel, mapping, well-log, synthetic seismic, etc software from any time interval at any location or set of locations |
| Visualization software needed? | Yes |
| If above answer is yes | |
| Other visualization software | SedView |
| Process description model | |
|---|---|
| Describe processes represented by the model | sediment erosion, transport and deposition, slope failure and slumping and resultant gravity flows (densites, turbidites), ocean currents (geostrophic), tidal currents, wind-driven waves (CERC equation, breaking wave and radiative stress) , storms, isostatic response (efficient 3D multigrid solution), tectonics, syn-depositional compaction and post-depositional burial compaction, carbonate and algal growth and post-depositional erosion. |
| Describe key physical parameters and equations | Sedsim utilises the shallow water equations on a fixed orthogonal grid. They assume the flow has uniform velocity across its entire depth. Shallow water equations are valid for flows with characteristic horizontal length scale greater than the characteristic vertical length scale. Friction forces are calculated through the use of Manning coefficients. The shallow water equations are solved using a ‘marker in cell’ technique, in which the equations (apart from a very minor diffusion term) can be expressed as an ODE, which is solved with a Cash Karp Runge-Kutta scheme. The transport capacity of a fluid element is a function of its volume, height, flow velocity, slope, shear stress, unit stream power and Manning coefficient. Sediment deposition and erosion are determined by the balance between the transport capacity and the current sediment load. Deposition is limited by the fall velocities, whilst surface shear stress limits erosion. Fluid element gradient is either calculated locally over the four surrounding grid points, or across multiple cells depending on the conditions. Gradients are calculated from the top water surface for turbidity and normal currents, and from the base of the flow for debris flows. |
| Describe length scale and resolution constraints | Sedsim has been tested and applied at spatial resolutions from cm (flume tank models), thru beach processes (5 m resolution), and reservoir scale (10 m to 100 m resolution) to basin scales (up to 1000 km and 10 km resolution). Model sizes have varied from 3 m (flumes) to 3000 km x 2000 km. |
| Describe time scale and resolution constraints | Sedsim has been tested and applied at temporal resolutions from seconds (flume tanks), to hours, days, years (beaches and estuaries), to thousands of years (basins). Durations of runs have included hours (flume tanks) to 100 Ma. |
| Describe any numerical limitations and issues | Sedsim uses a fixed orthogonal grid, therefore aliasing of fine features in a large-scale simulation is an issue that is handled by nesting fine grids at chosen locations within a larger model. It also means that extensional and compressional tectonics cannot be modelled, only vertical inter-cell movement. |
| Model testing | |
|---|---|
| Describe available calibration data sets | Many calibration data-sets available from flume, beach, basin studies. Contact us for information and exchange details |
| Upload calibration data sets if available: | |
| Describe available test data sets | Many test data-sets available from flume, beach, basin studies. Contact us for information and exchange details |
| Upload test data sets if available: | |
| Describe ideal data for testing | Sedsim needs at least: a surface grid (from DEM, seismic, well data etc.), location(s) and nature(s) of sediment input, a water level (and file of change with time if available).
If available and the problem warrants it: wave field, storm statistics, temperature field, salinity field, tides, ocean currents, species-specific carbonate and algal growth environments |
| Users groups model | |
|---|---|
| Do you have current or future plans for collaborating with other researchers? | Always willing to discuss possibilities |
| Documentation model | |
|---|---|
| Provide key papers on model if any | Papers:
|
| Is there a manual available? | Yes |
| Upload manual if available: | |
| Model website if any | http://www.csiro.au/products/Sedsim.html#3 |
| Model forum / discussion board | |
| Additional comments | |
|---|---|
| Comments | Sedsim code has been in continuous development and application in Australia since 1996, building on the initial Stanford code from Dan Tetzlaff, Johannes Wendebourg and other PhD students. The model is evolving rapidly as new application areas emerge. We have just finished a 5 year study linking Sedsim to climate models in order to predict the range of possible responses of the entire Australian EEZ seabed to climate change over a 50 year time interval. This tested Sedsim's ability to model the full range of processes from carbonate production to storm and wave impact. The results are open file and we will make the data-sets available to other groups. In oil-field applications we are carrying out both basin and reservoir-scale studies. |
