Numerical simulations for Opti-Morph testing
This dataset is the set of data underlying the article entitled Opti-Morph, a new platform for sandy beach dynamics by constrained wave energy minimization.
The article in question can be found here: HAL Id: hal-03272051
Opti-Morph is a new hydro-morphodynamic model whose aim is to describe the natural evolution of the coastal zone using a principle based on optimizational theory. A detailed description of Opti-Morph can be found in its user-guide: HAL Id: hal-03348827
The initial data used by Opti-Morph to describe the evolution of the shape of the seabed has also been used the hydro-morphodynamic model XBeach for a comparative evaluation.
Both numerical models are also compared to experimental data, provided by GLADYS (www.gladys-littoral.org).
The physical experimentation called COPTER 2D, is a series of hydro-morphodynamic simulations conducted in a 35m long wave flume, and performed with facilities located at the LEGI (France). The equipment used consists of a wave flume equipped with a wave maker, a mobile sea bottom made of artificial particles set on a mild slope hard beach, a set of 20 capacitive gages to monitor waves and an ultrasonic gage plus laser beam on rails to quantify morphodynamics.
For more information on the dataset, contact megan.cook@umontpellier.fr
The data is organized into 3 folders for each of the 3 figures of the article (Figures 2, 3 and 4).
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*************************************** GENERALITIES ****************************************
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For each figure, the input data and the output data used is provided in their respective folders.
Input file format:
Each column of the init.txt file corresponds to:
- domain discretization (m)
- initial seabed elevation function (m)
- bedrock elevation function (m)
- mobility parameter (m.s/kg) (see Opti-Morph user-guide)
- maximal sand slope parameter ()
Each column fo the time_init.txt file corresponds to:
- time discretization (s)
- forcing wave height (m)
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***************************************** Figure 2 ******************************************
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This figure shows a comparison of mean wave height over a short-term simulation (the same as Figure 3) in an effort to validate the hydrodynamic model used by Opti-Morph. The numerical data calculated by Opti-Morph (meanH_opti.txt) is compared to the numerical data provided by XBeachs hydrodynamic module (xboutput.nc). The results of both models are calculated using the same initial data found in init.txt file (and time_init.txt of Figure 2), and compared to the flume experimental data given in Hrms_ref_6.txt.
NB. Xref.grd is the discretization of the XBeach data.
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***************************************** Figure 3 ******************************************
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The figure is a comparative analysis of the final seabed after a 30-minute simulation. The data calculated by Opti-Morph (in the Results folder) is compared to physical flume data (in the Experimental folder) and the numerical data provided by XBeach (in the XBeach folder). A robustness analysis of the mobility parameter and the maximal slope parameter also features in the Figure 3, the data of which can be found in the Robustness folder.
Experimental:
- morpho_final_exp.txt: final seabed from the physical flume experiment.
- x_exp.txt: discretization of the domain
Input:
- init.txt: initial spatial data used by Opti-Morph (see GENERALITIES)
- param.txt: parameters required by Opti-Morph (see user-guide for more information)
- time_init.txt: initial temporal data used by Opti-Morph (see GENERALITIES)
Results:
- final_opti.txt: final seabed elevation function after the Opti-Morph simulation, using the input data provided in the Input folder.
XBeach:
Standard layout of an XBeach simulation (see XBeach user-guide for more information)
Input:
- bathy.txt: initial seabed elevation function
- jons.txt: spectrum file (bcfile in param.txt)
- params.txt: input parameters of the XBeach model
- X_ref.grd: horizontal discretization of the domain
- Y_red.grd: vertical discretization of the domain
Output:
- xboutput.nc: output file of the XBeach model, where the final seabed elevation, calculated by XBeach, can be found.
Robustness:
A robustness analysis was conducted on the two hyper-parameters: the seabed mobility parameter and the maximal slope parameter. The simulations were performed in the same configuration as Figure 2, with modifications only to the hyper-parameter in question.
1.Mobility:
psi_01799_ref: final seabed with the seabed mobility parameter set at the reference value of 5.10^(-6) m.s/kg
psi_01799_mob-50%: seabed resulting from a decrease of the seabed mobility parameter by 50% with regards to its reference value
psi_01799_mob+50%: seabed resulting from an increase of the seabed mobility parameter by 50% with regards to its reference value
NB. Here, the maximal slope parameter is set to its reference value of 0.2.
2.Slope
psi_01799_ref: final seabed with the maximal slope parameter set at the reference value of 0.2
psi_01799_slope-50%: seabed resulting from a decrease of the maximal slope parameter by 50% with regards to its reference value
psi_01799_slope+50%: seabed resulting from an increase of the maximal slope parameter by 50% with regards to its reference value
NB. Here, the mobility parameter is set to its reference value of 5.10^(-6) m.s/kg.
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***************************************** Figure 4 ******************************************
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This figure depicts a longer simulation of the Opti-Morph model, with the aim of analysing it's behavior over a longer time series. Five forcing scenarios were considered: Scenarios 1 and 2 correspond to two 2-day simulations and scenarios 3, 4 and 5 depict three 6-day simulations.
Each simulation can be found in a folder of the same name. These folders include:
- Input folder: input data, in the same file set-up as Figure 2.
- Results / Output folder: The files with the prefix "H_" correspond to the significant wave height calculated by Opti-Morph at a given time. The time is given by the numerical suffix in the file name. Likewise, the files with the prefix "psi_" correspond to the seabed elevation function calculated by Opti-Morph at a given time.