Model:Bifurcation

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Bifurcation

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Single Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 1.5D Spatial extent Landscape-Scale Model domain Coastal One-line model description Flow-partitioning and avulsion in a river delta bifurcation Extended model description Bifurcation is a morphodynamic model of a river delta bifurcation. Model outputs include flux partitioning and 1D bed elevation profiles, all of which can evolve through time. Interaction between the two branches occurs in the reach just upstream of the bifurcation, due to the development of a transverse bed slope. Aside from this interaction, the individual branches are modeled in 1D. The model generates ongoing avulsion dynamics automatically, arising from the interaction between an upstream positive feedback and the negative feedback from branch progradation and/or aggradation. Depending on the choice of parameters, the model generates symmetry, soft avulsion, or full avulsion. Additionally, the model can include differential subsidence. It can also be run under bypass conditions, simulating the effect of an offshore sink, in which case ongoing avulsion dynamics do not occur. Possible uses of the model include the study of avulsion, bifurcation stability, and the morphodynamic response of bifurcations to external changes. Keywords: Name Gerard Salter Type of contact Model developer Institute / Organization St. Anthony Falls Laboratory Postal address 1 2 3rd Avenue SE Postal address 2 Town / City Minneapolis Postal code 55414 State Minnesota Country United States Email address salte040@umn.edu Phone Fax Supported platforms Unix, Linux, Mac OS, Windows Other platform Programming language Matlab Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2015 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code, As teaching tool Source code availability (Or provide future intension) Through CSDMS repository Source web address Source csdms web address https://github.com/csdms-contrib/bifurcation Program license type GPL v3 Program license type other Memory requirements Typical run time minutes Describe input parameters Modify input parameters directly in Matlab script Inputs include initial conditions, upstream flow conditions, bifurcation geometry, bypass fraction, sea level (optional), differential subsidence rate (optional) Input format Other input format Describe output parameters time series - such as water and sediment partitioning spatial - such as bed elevation profiles, saved at lower time resolution (chosen by user) Output format Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model quasi-normal flow (1D) downstream and transverse sediment fluxes mass conservation (Exner) Describe key physical parameters and equations see publication Describe length scale and resolution constraints cell size of the upstream two cells is an intrinsic model parameter, but downstream cell size can be chosen arbitrarily Describe time scale and resolution constraints none Describe any numerical limitations and issues uses forward-Euler timestepping, therefore timestep must be small enough to insure numerical stability 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 Do you have current or future plans for collaborating with other researchers? Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant Yes BMI compliant Yes WMT component Yes PyMT component Is this a data component Can be coupled with:

Model info Authors Gerard Salter Source code View in CSDMS GitHub repository Model citations Nr. of publications: 1 Total citations: 31 h-index: 1 m-quotient: 0.12 QR-code Link to this page Other models by author Bifurcation

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Nr. of publications:	1
Total citations:	31
h-index:	1
m-quotient:	0.12

Featured publication(s)	Year	Model described	Type of Reference	Citations
Salter, Gerard; Paola, Chris; Voller, Vaughan R.; 2018. Control of Delta Avulsion by Downstream Sediment Sinks. Journal of Geophysical Research: Earth Surface, 123, 142–166. 10.1002/2017JF004350 (View/edit entry)	2018	Bifurcation	Model overview	31
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