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Hydrodynamics.md
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......@@ -24,11 +24,11 @@ The results of the tracer simulation with the 3D hydrodynamic model were used to
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# Calibration exchange rates
The exchange rates between the neighboring compartments are estimated by fitting the output of the DEMO tracer model to the artificial data generated by the GetM/GotM model. Initial conditions for each compartment were calculated from the artificial data as the average fraction of North Sea water in each compartment during the first four tidal cycles. The models are fitted using the modFit function in R (Soetaert and Petzold, 2010)[^3228]. The 1D model and the models with the 4 and 28 compartments are fitted separately. The parameters were estimated using the Levenberg-Marquardt algorithm where the objective was to minimize the sum of squared residuals (SSR).
The exchange rates between the neighboring compartments are estimated by fitting the output of the DEMO tracer model to the artificial data generated by the GetM/GotM model. Initial conditions for each compartment were calculated from the artificial data as the average fraction of North Sea water in each compartment during the first four tidal cycles. The models are fitted using the modFit function in R (Soetaert and Petzold, 2010)[^3228]. The 1D model and the models with the 4 and 28 compartments are fitted separately. The parameters were estimated using the Levenberg-Marquardt algorithm where the objective was to minimize the sum of squared residuals (SSR) between model and "observations".
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## 0D model
For the 0D model only 1 parameter (exchange rate between the North Sea and the Oosterschelde) had to be fitted.
For the 0D model only 1 parameter (exchange rate between the North Sea and the Oosterschelde) had to be fitted. In the figure below, the fitted model is compared with the artificial data. The titted model is used to calculate the average residence time () and
<img src="uploads/1330829c6ca42292905fc206459974bd/Tracer_0D.png" width="500">
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