From csdms
[edit] FanBuilder
Contents |
[edit] Metadata
| Modeler information | |
|---|---|
| First name | Remco |
| Last name | Groenenberg |
| Type of contact | Model developer |
| Institute / Organization | Delft University of Technology |
| Postal address 1 | Stevinweg 1 |
| Postal address 2 | |
| Town / City | Delft |
| Postal code | 2628 CN |
| State | NO STATE |
| Country | The Netherlands |
| Email address | r.m.groenenberg@tudelft.nl |
| Phone | +31-15-2783843 |
| Fax | +31-15-2781189 |
| Model identity | |
|---|---|
| Model type | Single |
| Spatial dimensions | |
| Spatial extent | |
| Model domain | |
| One-line model description | Process-based stratigraphic evolution of turbidite fans model |
| Extended model description | FanBuilder is a process-based model designed to simulate the stratigraphic evolution of turbidite fans. It simulates turbidity-current flow, erosion, and deposition on arbitrary basin-floor topography and accommodates various grain sizes. It unifies conservation of fluid mass, sediment mass and momentum in the form of the depth-averaged shallow-water approximation in combination with the Boussinesq approximation for density-driven flow in three dimensions. Sediment transport is modelled by an advection-diffusion type equation. Exchange of sediment with the bed is largely based on existing models for entrainment and deposition. Input for the model consists of parameters defining the initial basin-floor topography and parameters related to the composition of the flows, such as the grain-size distribution of the sediment, the flow density, and the magnitude and frequency of the flows. The model is solved numerically on a rectangular grid (representing topography) by means of a second-order finite-difference approximation, and employs a shock-capturing technique to accurately model the speed and shape of the discontinuous flow front, which is characteristic of density-driven flows. The model is embedded in a computer application which visualizes the evolution of the flows and the resulting stratigraphy (thickness, mean grain size) instantaneously during simulation. |
| Model technical information | |
|---|---|
| Supported platforms | Windows |
| Other platform | |
| Programming language | C, C++ |
| Other program language | MFC, OpenGL |
| Code optimized | |
| Start year development | 2002 |
| Does model development still take place? | Yes |
| If above answer is no, provide end year model development | |
| Model availability | |
| Source code availability (Or provide future intension) | |
| Source web address | |
| Program license type | Other |
| Program license type other | No license yet |
| OpenMI compliant | No not possible |
| CCA component | No not possible |
| IRF interface | No not possible |
| Memory requirements | a few 100s of Mb |
| Typical run time | tens of minutes to hours |
| Input - Output description | |
|---|---|
| Describe input parameters | a grid defining the initial bathymetry, a subsidence grid (optional), mean and standard deviations for (lognormally) distributed values of: flow magnitude and recurrence, inflow depth, inflow velocity, inflow concentration, inflow location, width of inflow. furthermore, the properties of the grain size(s), the thickness, porosity and composition of the initial substrate, the total time span of the simulation and a seed for initialization of the RNG |
| Input format | ASCII |
| Other input format | |
| Describe output parameters | basically, for each bed in the stratigraphy the thickness and composition (grain size fractions) |
| Output format | ASCII |
| Other output format | |
| Pre-processing software needed? | No |
| Describe pre-processing software | |
| Post-processing software needed? | Yes |
| Describe post-processing software | any gridding package (e.g. surfer, CPS) |
| Visualization software needed? | No |
| If above answer is yes | |
| Other visualization software | |
| Process description model | |
|---|---|
| Describe processes represented by the model | (low-density) turbidity current flow, and resulting sedimentation due to erosion and deposition |
| Describe key physical parameters and equations | shallow-water equations adapted for density-driven flow, i.e., combined with Boussinesq approximation, and valid for suspensions up to 5% concentration by volume. key parameters are the slope, the grain size, the (basal) friction coefficient, the erodibility of the substrate, and the parameters defining the flow at entrance into the model domain (depth, velocity, concentration) |
| Describe length scale and resolution constraints | length scale can by anywhere between meter-scale and kilometer-scale, but resolution is tied to performance, optimum must be sought for each application individually |
| Describe time scale and resolution constraints | since the numerical scheme is a finite-difference scheme, the numerical time-step depends (almost) entirely on the grid cell size through the CFL criterion. |
| Describe any numerical limitations and issues | the wetting/drying problem, i.e., when deposit thickness exceeds the depth of the flow, the model often becomes unstable |
| Model testing | |
|---|---|
| Describe available calibration data sets | -- |
| Upload calibration data sets if available: | |
| Describe available test data sets | -- |
| Upload test data sets if available: | |
| Describe ideal data for testing | the model was tested against measurements on experimental turbidity currents and deposits published by Luthi (e.g. Sedimentology, 1980, Marine Geology, 1981) |
| Users groups model | |
|---|---|
| Do you have current or future plans for collaborating with other researchers? | No |
| Documentation model | |
|---|---|
| Provide key papers on model if any | not yet (submitted) |
| Is there a manual available? | No |
| Upload manual if available: | |
| Model website if any | No |
| Model forum / discussion board | |
| Additional comments | |
|---|---|
| Comments | No |
