From csdms
[edit] AquaTellUs
Contents |
[edit] Metadata
| Modeler information | |
|---|---|
| First name | Irina |
| Last name | Overeem |
| Type of contact | Model developer |
| Institute / Organization | CSDMS, INSTAAR, University of Colorado |
| Postal address 1 | 1560 30th street |
| Postal address 2 | |
| Town / City | Boulder |
| Postal code | 80305 |
| State | Colorado |
| Country | USA |
| Email address | irina.overeem@colorado.edu |
| Phone | 303-492-6631 |
| Fax | |
| Model identity | |
|---|---|
| Model type | Single |
| Spatial dimensions | 2D |
| Spatial extent | |
| Model domain | , |
| One-line model description | Fluvial-dominated delta sedimentation model |
| Extended model description | AquaTellUs models fluvial-dominated delta sedimentation. AquaTellUS uses a nested model approach; a 2D longitudinal profiles, embedded as a dynamical flowpath in a 3D grid-based space. A main channel belt is modeled as a 2D longitudinal profile that responds dynamically to changes in discharge, sediment load and sea level. Sediment flux is described by separate erosion and sedimentation components. Multiple grain-size classes are independently tracked. Erosion flux depends on discharge and slope, similar to process descriptions used in hill-slope models and is independent of grain-size. Offshore, where we assume unconfined flow, the erosion capacity decreases with increasing water depth. The erosion flux is a proxy for gravity flows in submarine channels close to the coast and for down-slope diffusion over the entire slope due to waves, tides and creep. Erosion is restricted to the main flowpath. This appears to be valid for the river-channel belt, but underestimates the spatial extent and variability of marine erosion processes.
Deposition flux depends on the stream velocity and on a travel-distance factor, which depends on grain size (i.e. settling velocity). The travel-distance factor is different in the fluvial and marine domains, which results in a sharp increase of the settling rate at the river mouth, mimicking bedload dumping. Dynamic boundary conditions such as climatic changes over time are incorporated by increasing or decreasing discharge and sediment load for each time step. |
| Model technical information | |
|---|---|
| Supported platforms | Windows |
| Other platform | |
| Programming language | C |
| Other program language | |
| Code optimized | Single Processor |
| Start year development | 1997 |
| Does model development still take place? | Yes |
| If above answer is no, provide end year model development | |
| Model availability | As code |
| Source code availability (Or provide future intension) | Through owner |
| Source web address | |
| Program license type | Other |
| Program license type other | -- |
| OpenMI compliant | No but possible |
| CCA component | No but possible |
| IRF interface | No but possible |
| Memory requirements | High |
| Typical run time | hours |
| Input - Output description | |
|---|---|
| Describe input parameters | Simulation time (t) and time step (dt), Initial grid size and slope, Incoming discharge and sediment load (t), Sea level (t), no of grain size classes, grain size distribution, grain size.
Sediment transport coeficients |
| Input format | ASCII |
| Other input format | |
| Describe output parameters | Grid of deposition of different grains over time.
The model generates postscript files of stratigraphic sections. |
| Output format | ASCII |
| Other output format | |
| Pre-processing software needed? | No |
| Describe pre-processing software | |
| Post-processing software needed? | Yes |
| Describe post-processing software | Grid plotting software, Postscript plotting software |
| Visualization software needed? | Yes |
| If above answer is yes | Matlab |
| Other visualization software | SURFER/GRAPHER |
| Process description model | |
|---|---|
| Describe processes represented by the model | Fluvial erosion and depositions, lateral deposition across the floodplain, plume deposition in marine domain. |
| Describe key physical parameters and equations | See references. |
| Describe length scale and resolution constraints | The model domain starts in the fluvial floodplain, the main river channel is considered an incoming boundary condition.
Gridcells are typically averaged over 100's meters to 1000's of meters. Tests ran with grids of 150 by 150 km. |
| Describe time scale and resolution constraints | Developed as a stratigraphic model, approach is event-based. Intended time scale ranges from several decades to Holocene (10-10.000yrs). |
| Describe any numerical limitations and issues | Code is research grade |
| Model testing | |
|---|---|
| Describe available calibration data sets | Not readily available; theoretical experiments are available as examples. |
| Upload calibration data sets if available: | |
| Describe available test data sets | AquaTellUs was originally developed for simulation of the fluvial-dominated Volga delta. The 2D experiments are still available and can be used as a test data set. |
| Upload test data sets if available: | |
| Describe ideal data for testing | Boundary conditions like river discharge and sediment loads, input grainsize data, sea level history.
Floodplain and deltaic sedimentation rates and grainsize data. |
| Users groups model | |
|---|---|
| Do you have current or future plans for collaborating with other researchers? | Intent to use for braided Arctic fan deltas.
CSDMS group is currently working on floodplain processes and bedload distribution patterns based on RS data. |
| Documentation model | |
|---|---|
| Provide key papers on model if any | Papers:
|
| Is there a manual available? | No |
| Upload manual if available: | |
| Model website if any | |
| Model forum / discussion board | |
| Additional comments | |
|---|---|
| Comments | Code is research grade and needs to be refractored before submission to CSDMS. |
