Model:Quad

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Quad

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Tool Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 1D Spatial extent Regional-Scale, Landscape-Scale Model domain Coastal One-line model description Geometric model to study the response of fluvial-deltas to base-level changes. Extended model description We present a geometric model able to track the geomorphic boundaries that delimit the fluvial plain of fluvial-deltas: the shoreline and the alluvial-bedrock transition. By assuming a fluvial profile with a quadratic form, which satisfies the overall mass balance and the boundary conditions dictated by diffusive transport, we are able to provide a solution that accounts for general base-level changes. Keywords: delta evolution, shoreline dynamics, alluvial-basement transition, base-level changes, Name Jorge Lorenzo Trueba Type of contact Model developer Institute / Organization Saint Anthony Falls Laboratory Postal address 1 2 Third Ave SE Postal address 2 Town / City Minneapolis Postal code 55414 State Minnesota Country United States Email address loren153@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 2010 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) Source web address Source csdms web address Program license type GPL v2 Program license type other Memory requirements Typical run time typically less than 10 seconds Describe input parameters [[Describe input parameters model::Physical parameters: (1) Length scale [L]; (2) Average rate of water supply per unit width [L^2/T]; (3) Basement slope [-]; (4) sediment unit-flux, defined as the sediment input from the river network in units of volume per unit width [L^2/T]; (5) Base-level curve. Time and printout parameters: (1) Running time (Tmax), (2) time step (dt), (3) number of time steps per output storage (w).]] Input format ASCII Other input format Describe output parameters Shoreline and alluvial-bedrock transition trajectories over time. Future versions of the model will include the profile evolution. Output format ASCII 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 We model sedimentation in a fluvio-deltaic system under base-level changes. Possible dynamics include: (1) river aggradation (i.e., a seawards migration of the alluvial-basement transition), (2) river degradation (i.e., a landwards migration of the alluvial-basement transition), (3) regression (i.e., a seawards migration of the shoreline), and (4) transgression (e.g., a landwards migration of the shoreline). Describe key physical parameters and equations The key physical parameters are: (1) the sediment unit-flux, defined as the sediment input from the river network in units of volume per unit width. (2) The average water discharge per unit width. (3) The basement slope on top of which the delta develops. (4) The base-level curve. The key equations are a sediment mass balance and the boundary conditions dictated by diffusive transport (i.e., the sediment flux is proportional to the local bed slope through the fluvial diffusivity). To first order calculations, we assume the fluvial diffusivity to be half the water discharge per unit width (they both have the same units). More accurate expressions for the fluvial diffusivity can be found in Paola 2000 and Lorenzo-Trueba et al.2009. Describe length scale and resolution constraints In the field, this model is applicable in the range of landscape and regional scales (~10-100km). It has also been successfully applied at the scale of physical experiments. Describe time scale and resolution constraints We use the ‘basin equilibrium timescale’ (Paola 2000), defined as the length scale square divided by the fluvial diffusivity. In field settings, this time scale can range from centennial to millennia up to millions of years. Describe any numerical limitations and issues Currently it is not possible to model transgression followed by regression. Describe available calibration data sets No calibration data sets. We validate the model against available analytical solutions and use it to analyze the system behavior under a general base-level fall and base-level rise. See Lorenzo-Trueba et al. 2012. Upload calibration data sets if available: Describe available test data sets Upload test data sets if available: Describe ideal data for testing Physical experiments and/or field observations of the sedimentary record. 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 No but possible BMI compliant No but possible WMT component No but possible PyMT component Is this a data component Can be coupled with:

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