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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-314
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-314
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 04 Feb 2019

Development and technical paper | 04 Feb 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).

glmGUI v1.0: an R-based Geographical User Interface and toolbox for GLM (General Lake Model) simulations

Thomas Bueche1,2, Marko Wenk3, Benjamin Poschlod1, Filippo Giadrossich4, Mario Pirastru4, and Mark Vetter5 Thomas Bueche et al.
  • 1Department of Geography, Ludwig-Maximilians-University Munich, Germany
  • 2WipflerPLAN Planungsgesellschaft mbH, Pfaffenhofen a. d. Ilm, Germany
  • 3Independent Scholar, Stuttgart, Germany
  • 4Dipartimento di Agraria, Unversity of Sassary, Italy
  • 5Faculty of Plastics Engineering and Surveying, University of Applied Sciences Würzburg-Schweinfurt, Germany

Abstract. Numerical modeling provides the opportunity to quantify the reaction of lakes on alterations in their environment, such as changes in climate or hydrological conditions. The one-dimensional hydrodynamic General Lake Model (GLM) is an open-source software and widely used within the limnological research community. Nevertheless, neither an interface to process the input data and run the model, nor tools for an automatic parameter calibration exist. Hence, we developed glmGUI, a Geographical User Interface (GUI) including a toolbox for an autocalibration, parameter sensitivity analysis, and several plot options. The tool is provided as a package for the freely available scientific code language R. The model parameters can be analyzed and calibrated for the simulation output variables water temperature and lake level.

The glmGUI package is tested for two sites (Lake Ammersee, Germany, and Lake Baratz, Italy) distinguishing in size, mixing regime, hydrology of the catchment area (i.e. the number of inflows and their runoff seasonality), and climatic conditions. A robust simulation of water temperature for both lakes (Ammersee: RMSE = 1.17 °C, Baratz: RMSE = 1.30 °C) is achieved by a quick automatic calibration. The quality of a water temperature simulation can be assessed immediately by a difference plot provided by glmGUI, which displays the distribution of the spatial (vertical) and temporal deviations. The calibration of the lake level simulations of Lake Ammersee for multiple hydrological inputs including also unknown inflows yielded a satisfactory model fit (RMSE = 0.20 m). This shows that GLM can be also used to estimate the water balance of lakes correctly. The tools provided by glmGUI enable a less time-consuming and simplified parameter optimization within the calibration process. Due to this, the free availability and the implementation in a GUI, the presented R package expands the application of GLM to a broader field of lake modeling research and even beyond limnological experts.

Thomas Bueche et al.
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Thomas Bueche et al.
Model code and software

R Package: glmgui M. Wenk, B. Poschlod, T. Büche, and M. Vetter https://doi.org/10.5281/zenodo.2025865

Thomas Bueche et al.
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Short summary
The R-based Geographical User Interface glmGUI provides tools for pre- and postprocessing of General Lake Model (GLM) simulations, including an autocalibration, parameter sensitivity analysis, and several plot options. The model parameters can be analyzed and calibrated for the simulation output variables water temperature and lake level. The toolbox is tested for two sites (Lake Ammersee, Germany, and Lake Baratz, Italy).
The R-based Geographical User Interface glmGUI provides tools for pre- and postprocessing of...
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