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@@ -1,16 +1,16 @@
 Pamhyr2: a graphical user interface for 1D hydro-sedimentary modelling of rivers 
-Pierre-Antoine Rouby1, Benoît Camenen, Lionel Penard, Léa Kieffer, Théophile Terraz1
+Pierre-Antoine Rouby1, Benoît Camenen, Lionel Pénard, Léa Kieffer, Théophile Terraz1
 INRAE, UR RiverLy, centre de Lyon-Grenoble, 5 rue de la Doua, CS20244, 69625, Villeurbanne, France.
 pierre-antoine.rouby@inrae.fr, benoit.camenen@inrae.fr, lionel.penard@inrae.fr, 
 lea.kieffer@inrae.fr, theophile.terraz@inrae.fr
 KEY WORDS
 1D modelling, sedimentary modelling, user interface
 Abstract
-In numerical river simulation, one-dimensional models are commonly used to study water level and discharge for large domains or long time series. These models are less time-consuming than two- and three-dimensional numerical models, and require fewer input parameters and allow ensemble runs. To build a one-dimensional hydraulic model, a pre- and post-processing tool is needed for creating reach geometry, specifying initial and boundary conditions, friction coefficients and other numerical parameters. Such a tool needs to ensure the consistency of the model and provide a user-friendly graphical user interface. In this article, we present Pamhyr2, the fully rebuilt version of the PAMHYR modelling platform. It is developed using Python, PyQt and MatPlotLib. Pamhyr2 is free and open-source, multilingual, cross-platform (Linux, Windows) and is generic enough to accept various one-dimensional solvers. Pamhyr2 includes and enhances all the features from the previous version: multiple-reach modelling, geometry definition from cross-section data, initial and boundary conditions, friction coefficients, hydraulic structures, lateral inflow, punctual intake and the results visualization window. In addition, this version includes new features such as pollutants modelling, bed-load and bed evolution. We describe several windows: the creation of sedimentary layers in the river bed, the sediment characteristics for each layer, the sediment, and pollutant boundary conditions and the lateral inputs. These functionalities are illustrated with simple examples. We finally show the visualization windows for bed evolution. 
+In numerical river simulation, one-dimensional models are commonly used to study water level and discharge for large domains or long time series. These models are less time-consuming than two- and three-dimensional numerical models, and require fewer input parameters and allow ensemble runs. To build a one-dimensional hydraulic model, a pre- and post-processing tool is needed for creating reach geometry, specifying initial and boundary conditions, friction coefficients and other numerical parameters. Such a tool needs to ensure the consistency of the model and provide a user-friendly graphical user interface. In this article, we present Pamhyr2, the fully rebuilt version of the PAMHYR modelling platform. It is developed using Python, PyQt and Matplotlib. Pamhyr2 is free and open-source, multilingual, cross-platform (Linux, Windows) and is generic enough to accept various one-dimensional solvers. Pamhyr2 includes and enhances all the features from the previous version: multiple-reach modelling, geometry definition from cross-section data, initial and boundary conditions, friction coefficients, hydraulic structures, lateral inflow, punctual intake and the results visualization window. In addition, this version includes new features such as pollutants modelling, bed-load and bed evolution. We describe several windows: the creation of sedimentary layers in the river bed, the sediment characteristics for each layer, the sediment, and pollutant boundary conditions and the lateral inputs. These functionalities are illustrated with simple examples. We finally show the visualization windows for bed evolution. 
 1.	introduction
-Numerous tools are available to simulate river flow. Among them, one-dimensional (1D) numerical hydraulic models have the advantage of being accurate while being inexpensive in terms of computation time, making it possible to simulate long rivers over very long timescales. A lot of 1D numerical solvers for river hydraulics are available, including HEC-RAS2, Mike 113 and Mascaret4 for example. However, in order to investigate specific research issues it is essential to have the ability to edit the source code of numeric solvers and to have an ergonomic Graphical User Interace (GUI). Most of the widespread 1D modeling tools are either written with a proprietary source code (such as HEC-RAS and Mike 11) or are research tools with irregularly maintained GUI. On its side, INRAE has been developing two 1D solvers for over 40 years: Mage5  and RubarBE6. In parallel, a GUI named PAMHyR has been developed to enable modelers to build river models, parameterize calculations, launch Mage [5] and RubarBE solvers and post-process the results [3].
+Numerous tools are available to simulate river flow. Among them, one-dimensional (1D) numerical hydraulic models have the advantage of being accurate while being inexpensive in terms of computation time, making it possible to simulate long rivers over very long timescales. A lot of 1D numerical solvers for river hydraulics are available, including HEC-RAS2, Mike 113 and Mascaret4 for example. However, in order to investigate specific research issues it is essential to have the ability to edit the source code of numeric solvers and to have an ergonomic Graphical User Interace (GUI). Most of the widespread 1D modeling tools are either written with a proprietary source code (such as HEC-RAS and Mike 11) or are research tools with irregularly maintained GUI. On its side, INRAE has been developing two 1D solvers for over 40 years: Mage5 [5]  and RubarBE6. In parallel, a GUI named PAMHyR has been developed to enable modelers to build river models, parameterize calculations, launch Mage and RubarBE solvers and post-process the results [3].
 
-	PAMHyR, developed in Java since the end of 90s (originally named X-NT), it was written with the following constraints in mind: 
+	PAMHyR, developed in Java since the end of 90s (originally named X-NT), it is written with the following constraints in mind: 
     • Multi-platform Windows, Unix-like,
     • no dependence on an external graphics library with a paid license for user, 
     • generate as much code as possible from a UML diagram.
@@ -20,15 +20,13 @@ INRAE needs a new tool to keep up with today’s technologies and with the devel
 2.1	History and need 
 PAMHyR is available for two solvers, with two different types of studies: Mage and RubarBE. These two different kinds of studies have mostly similar interfaces, but have their own specific features. They can both be used to: define reach geometry, boundary conditions, lateral inflows, overflows, friction, and structures. In addition, you can run the solver on the study you are editing, and view the solver's results. Firstly, although both Mage and RubarBE are multiple-reach compatible, only the Mage interface enables multiple-reach study editing. Secondly, many small details change from one interface to the next. In addition, the latest Mage features, for example, are not available for modeling in the interface.
 
-	A total overhaul of the Java code would be too much work, given the technological debt accumulated since the beginning of its development. What's more, the software is only in French and the code is closed (the sources are not available), which is a hindrance to the notoriety of the software as well as to the vitality of development.
-
-	In view of the workload involved in modernizing PAMHyR, the decision was made to develop a new version of the software from scratch. This version should be equivalent to the Java version in terms of functionality, and add new features, notably the new Mage functionalities. The aim was also to have an interface that was more modern, more user-friendly, more flexible, available on multiple platforms and in different languages. The interface must also have a certain degree of generality and be able to adapt to different solvers without major changes to the interface. It's also important that the code is open to contributions, to keep the project as lively as possible.
+	A total overhaul of the Java code would be too much work, given the technological debt accumulated since the beginning of its development. Given the workload involved in modernizing PAMHyR, the decision is made to develop a new version of the software from scratch. This version should be equivalent to the Java version in terms of functionality, and add new features, notably the new Mage functionalities. The aim is also to have an interface that is more modern, more user-friendly, more flexible, available on multiple platforms and in different languages. The interface must also have a certain degree of generality and be able to adapt to different solvers without major changes to the interface. It is also important that the code is open to contributions, to keep the project as lively as possible.
 2.2	Technical choices
 From a technical point of view, choices were made on the basis of the above-mentioned objectives (modernity, maintainability, multiplatform, multilingual, user-friendliness, flexibility), as well as: the ease of learning the technology to facilitate contribution to the software, the popularity of the technology in the scientific community and the interoperability of this technology.
 
-	We chose Python7 as our programming language. It is a popular language in the scientific world, but also in many other fields, with lot of very active software libraries. What's more, it's a simple and interpreted language, often recommended for beginners, and practiced by beginners and experienced developers. In addition, there is the PyQT8 software library that lets you use the Qt9 GUI library, which is ideal for this project. It is very popular and active, and available on many platforms (GNU/Linux, Windows, MacOS, Unix, BSD, Android, iOS). Qt also includes a number of tools for translating interfaces into different languages. Here we use the community version of Qt, with no paid features. For graphics and visualization, the choice fell on MatPlotLib10, which is very popular in the scientific community and can be used to draw a wide variety of graphics. For saving studies, the choice was made to use SQLite11, unlike the previous version which used a text file formatted in XML. The advantages of a SQLite database, in addition to being supplied with Python, include ease of use, interoperability, fast, formal structuring by table and consistency checking between tables. We have chosen to version the database to allow it to evolve with the software, now it is possible to add columns to tables or make other minor modifications to the database without breaking the compatibility of studies from previous versions. However, PAMHyR and Pamhyr2 study files are incompatible, and old studies have to be recreated for this version.
+	We chose Python7 as our programming language. It is a popular language in the scientific world, but also in many other fields, with lot of very active software libraries. Moreover, it is a simple and interpreted language, often recommended for beginners, and practiced by beginners and experienced developers. In addition, there is the PyQT8 software library that lets you use the Qt9 GUI library, which is ideal for this project. It is very popular and active, and available on many platforms (GNU/Linux, Windows, MacOS, Unix, BSD, Android, iOS). Qt also includes a number of tools for translating interfaces into different languages. Here we use the community version of Qt, with no paid features. For graphics and visualization, the choice fell on Matplotlib10, which is very popular in the scientific community and can be used to draw a wide variety of graphics. For saving studies, the choice was made to use SQLite11, unlike the previous version which used a text file formatted in XML. The advantages of a SQLite database, in addition to being supplied with Python, include ease of use, interoperability, fast, formal structuring by table and consistency checking between tables. We have chosen to version the database to allow it to evolve with the software, and to make it possible to add columns to tables or make other minor modifications to the database without breaking the compatibility of studies from previous versions. However, PAMHyR and Pamhyr2 study files will not be compatible anymore, and previous studies have to be recreated for this version.
 
-	This new version of PAMHyR remains closely linked to the Mage solver with which it is supplied. But the ambition of flexibility and generalization gives us the opportunity to develop an interface that can be adapted to other solvers. There can be two solutions for using a solver with Pamhyr2: either the solver adapt to Pamhyr2, or Pamhyr2 adapt to the solver. So Pamhyr2 must integrate a generic output containing the study data that can be used by other solvers, which will be launched via an external executable, and then a generic result input that must be supplied by the solver. In addition, Pamhyr2 must be able to handle the execution and reading of results for specific solvers, and the addition of a solver to PAMHYR must be reasonably easy for the solver developer. We have opted for a free (as in freedom/liberty) and open source software (FOSS) [6] licence the GPLv312, which guarantees freedom to access, study, modify, redistribute and share. In addition, it guarantees that Pamhyr2's code will remain free and will not be able to add any closed-source modifications. However, it will still be possible to use closed-source solvers, because solver is not a part of Pamhyr2.
+	This new version Pamhyr2 remains closely linked to the Mage solver with which it is supplied. But the ambition of flexibility and generalization gives us the opportunity to develop an interface that can be adapted to other solvers. There can be two solutions for using a solver with Pamhyr2: either the solver adapts to Pamhyr2, or Pamhyr2 adapts to the solver. So Pamhyr2 must integrate a generic output containing the study data that can be used by other solvers, which will be launched via an external executable, and then a generic result input that must be supplied by the solver. In addition, Pamhyr2 must be able to handle the execution and reading of results for specific solvers, and the addition of a solver to Pamhyr2 must be reasonably easy for the solver developer. We have opted for the free and open source software (FOSS) [6] license GPLv312, which guarantees freedom to access, study, modify, redistribute and share. In addition, it guarantees that Pamhyr2's code will remain free and is not allowed to be added any closed-source modifications. However, it will still be possible to use closed-source solvers, because solver is not a part of Pamhyr2.
 3.	DEVELOPMENTS
 3.1	New version of PAMHYR 
 Pamhyr2 currently features the following interfaces: Editing of river network, geometry, boundary conditions, lateral contribution, friction, initial conditions, solver numerical parameters, as well as the interface for launching a solver and displaying hydraulic and sediment results.
@@ -40,7 +38,7 @@ The river network corresponds to the topology of the hydraulic network of the ri
 Figure 1: River network window for a dummy river with 8 reaches, 2 upstream node (yellow), 1 downstream node (green) and 5 internal node (blue).
 
 3.1.2	Geometry
-Geometry editing (Figure 2) is linked to a reach; the reach used will be the last reach selected in the river network window. This window contains a table with the list of the reach’s cross-section (zone 1) and three graphics. A top view based on the XY positions of the cross-sections’ points (zone 2). A longitudinal view of all cross-section with the height of the lowest point of each profile (zone 3). Finally, a cross-sectional view is displayed (zone 4)  showing the selected cross-section with the previous and the following one in dotted line. Each cross-section is defined by a Kilometer Point (KP) and an optional name. The KP represents the longitudinal coordinate of the cross-section in the numerical solver. It is possible to add cross-sections and then select them to access an editing window, or to import cross-sections from file. Cross-section editing window takes the form of a table showing the raw data of the points that make up the cross-section, and a graph showing the current cross-section.
+Geometry editing (Figure 2) is linked to a reach; the reach used will be the last reach selected in the river network window. This window contains a table with the list of the reach’s cross-sections (zone 1) and three graphics. A top view based on the XY positions of the cross-sections’ points (zone 2). A longitudinal view of all cross-sections with the height of the lowest point of each profile (zone 3). Finally, a cross-sectional view is displayed (zone 4)  showing the selected cross-section with the previous and the following one in dotted line. Each cross-section is defined by a Kilometer Point (KP) and an optional name. The KP represents the longitudinal coordinate of the cross-section in the numerical solver. It is possible to add cross-sections and then select them to access an editing window, or to import cross-sections from file. Cross-section editing window takes the form of a table showing the raw data of the points that make up the cross-section, and a graph showing the current cross-section.
 
 
 
@@ -51,7 +49,7 @@ Boundary conditions (BC) are associated with a network node. There are three dif
 
 
 
-Figure 3: Edition window of the boundary conditions hydrograph for the Saar river upstream node named Upstream.
+Figure 3: Edition window of the boundary conditions hydrograph for the Saar river upstream node.
 3.1.3	Lateral contribution
 The user interface for lateral contributions is similar to that for boundary conditions, except that it applies to a part of a reach between two KP, and not to a node.
 3.1.4	Friction
@@ -63,7 +61,7 @@ Friction editing is linked to a reach, a friction coefficient is defined and the
 Figure 4: The reach portions for friction coefficient edition window for the Saar study.
 
 3.1.5	Initial conditions
-The initial conditions (Figure 5) are also linked to the reach, corresponding to the water level and flow rate at the initial time of the simulation. These two values can be defined separately for each reach cross-section. It is also possible to use predefined functions to generate a water line and flow rate.
+The initial conditions (Figure 5) are also linked to the reach, corresponding to the water level and flow rate at the initial time of the simulation. These two values can be defined separately for each cross-section of the reach. It is also possible to use predefined functions to generate a water line and flow rate.
 
 
 
@@ -81,14 +79,14 @@ The post processing window is made up of tables allowing you to select the reach
 
 
 
-Figure 7: Hydraulics results window for “Elargissement” tests case with a Mage solver at timestamps 2113200,0 sec for reach R1 and cross-section at KP 427,7778.
+Figure 7: Hydraulics results window for “Elargissement” tests case with a Mage solver at timestamps 2113200.0 sec for reach R1 and cross-section at KP 427.7778.
 
 3.2	New features
 Some new features are already implemented in Pamhyr2. First of all, the software is multilingual with English and French currently available. An other very useful enhancement, is the possibility to use the “Ctrl+Z” or “Ctrl+Shift+Z” shortcuts to undo or redo the user actions.
 
 	Another novelty lies in the initial conditions window. Previously the water line could be generated by constant height or altitude. It is now possible to give a minimum height with an increasing function from downstream to upstream, thus avoiding physically unrealistic water holes and getting a little closer to a real and physically coherent water line (Figure 5).
 
-	An important new feature in this version is the presence of sediment layers. They can be defined as show Figure 8. Sediment layers can be applied separately for each cross sections (Figure 9). As with friction, they must first be defined and then applied to a profile. They can also be applied separately to each point of a cross sections. Layers are defined by a height, a median diameter (D50), a sediment diameter range (Sigma) and a critical shear stress as described in Pierre Balayn PhD thesis [1]. The visualization of sedimentary results is currently done using a plot of the river profile, which shows the evolution of the bed bottom and the thickness of layers as a function of time (Figure 10).
+	An important new feature in this version is the presence of sediment layers. They can be defined as shown in Figure 8. Sediment layers can be applied separately for each cross-section (Figure 9). As with friction, they must first be defined and then applied to a profile. They can also be applied separately to each point of a cross-section. Layers are defined by a height, a median diameter (D50), a sediment diameter range (Sigma) and a critical shear stress as described in Pierre Balayn PhD thesis [1]. The visualization of sedimentary results is currently done using a plot of the river profile, which shows the evolution of the bed bottom and the thickness of layers as a function of time (Figure 10).
 
 
 
@@ -100,24 +98,22 @@ Figure 9: Sediment layers defined in Figure 8 applied to the reach Saar.
 
 
 
-Figure 10: Sedimentary results window for “Elargissement” tests case at timestamps 2113200,0 sec for reach R1 and cross-section at KP 427,7778. This example have only two sediment layers.
+Figure 10: Sedimentary results window for “Elargissement” tests case at timestamps 2113200.0 sec for reach R1 and cross-section at KP 427.7778. This example has only two sediment layers.
 
 4.	Future work
-Functionalities that may or may not have been present in the old PAMHYR, enabling the definition of structures, traps, suspended solids or dissolved pollutants in water, have yet to be developed. Additional options for visualizing results also need to be added. One possibility would be a graph generation tool that would allow the user to select x-axis and y-axis values, as well as the time range, to create a customized graph. We also planned an advanced feature with code-editing window to enable the user to define his own Matplotlib drawing function, which would be saved in the study. Presentation work is also planned to harmonize the application's icons and visuals (images, graphics, etc.). The aim is to make the application clearer and more user-friendly.
+Old PAMHyR functionalities and additional functionalities, allowed the definition of structures, traps, suspended solids or dissolved pollutants in water, have yet to be developed. Additional options for visualizing results also need to be added. One possibility would be a graph generation tool that would allow the user to select x-axis and y-axis values, as well as the time range, to create a customized graph. We also planned an advanced feature with code-editing window to enable the user to define his own Matplotlib drawing function, which would be saved in the study. Presentation work is also planned to harmonize the application's icons and visuals (images, graphics, etc.). The aim is to make the application clearer and more user-friendly.
 
 	Supporting new solvers and generic solvers will also be an important part of the remaining work. To use any solver, we need to define a generic output format for Pamhyr2 that is simple enough to be given as solver input without major code modification, or that can be processed by a simple Python script (for example). The same applies to the results file that Pamhyr2 will have to read. The main candidates for these generic formats are :
-    • SQLite, because it's easy to use and the library is compatible with most programming languages,
+    • SQLite, because it is easy to use and the library is compatible with most programming languages,
     • HDF513, a hierarchical file format widely used in scientific circles and compatible with many programming languages.
 
-	As the project progresses, it becomes more and more complicated to test all the functionalities by hand. A suite of tests and unit tests is needed to prevent regression bugs and ensure that the code remains maintainable. For the moment, no test have been defined. Unit tests will have to be developed on the model and each module will have to include tests, but higher-level functionalities will also have to be tested, such as the recording and playback of a complete study. It will be difficult to test the graphical par automatically, so tests will continue to be carried out manually.
-
-	Full documentation must also be provided to give users an overview of the features offered by Pamhyr2. This documentation must include descriptions of the configuration options, as well as explanations and examples of how to use each feature. In addition, this documentation must include a section for contributors and developers, with a technical presentation of the application, as well as a presentation of the translation, development, and debugging tools available.
+	As the project progresses, it becomes more and more complicated to test all the functionalities by hand. A suite of tests and unit tests is needed to prevent regression bugs and ensure that the code remains maintainable. For the moment, no such test has been defined. Unit tests will have to be developed on the model and each sub-module will have to include tests, but higher-level functionalities will also have to be tested, such as the recording and playback of a complete study. It will be difficult to test the graphical part automatically, so tests will continue to be carried out manually.
 
-	The French translation of Pamhyr2 is still incomplete, and work is needed on translating technical terms. For translations into other languages, we hope that external contributors will take on this work, but no languages other than English and French are currently planned from the development team.
+	Full documentation must also be provided to give users an overview of the features offered by Pamhyr2. This documentation must include descriptions of the configuration options, as well as explanations and examples of how to use each feature. In addition, this documentation must include a section for contributors and developers, with a technical presentation of the application, as well as a presentation of the translation, development and debugging tools available.
 
-	The application packages are currently available for GNU/Linux and Windows. Under GNU/Linux, a “.tar.xz” archive is available for download. It contains a “pamhyr” executable and all the software libraries needed to run it. It also contains a version of Mage compatible with this version of Pamhyr2. For Windows, this is an installer for application and a compatible version of Mage. Once installed, you can launch Pamhyr2 without any further action on your part. An installer for GNU/Linux systems is a work in progress. There are many choices for creating an installer, but their scope depends on the distribution for which they are intended. “.deb”, for example, is intended for Debian distributions and their derivatives (Ubuntu, Linux Mint, ...). We do not exclude other, more generic options.
+	For translations into other languages than English and French, we hope that external contributors will take on this work. But no languages other are currently planned by the development team. The application packages are currently available for GNU/Linux and Windows. Under GNU/Linux, a “.tar.xz” archive is available for download. For Windows, this is an installer for application and a compatible version of Mage. An installer for GNU/Linux systems is a work in progress. There are many choices for creating an installer, but their scope depends on the distribution for which they are intended. “.deb”, for example, is intended for Debian distributions and their derivatives (Ubuntu, Linux Mint, and so on). We do not exclude other, more generic options.
 5.	Conclusion
-After a great deal of preparatory work, experimentation, technical selection, proof-of-concept and several months of development, Pamhyr2 is currently in version “v0.0.0”14 and contains almost 20,000 lines of Python code. It allows to create a minimal 1D hydro-sedimentary study, run a Mage simulation and visualize some of the results obtained, all with a more user-friendly interface. But the software is still unstable and under development, and many modifications and improvements are still to be made before it can really be used by everyone. What's more, even though many of the features of the original version of PAMHyR are already available (see 3.1 page 3), there are still many to be added to make Pamhyr2 a complete, useful and fully functional piece of software..
+After a great deal of preparatory work, experimentation, technical selection, proof-of-concept and several months of development, Pamhyr2 is currently in version “v0.0.0”14 and contains almost 20,000 lines of Python code. It allows to create a minimal 1D hydro-sedimentary study, run a Mage simulation and visualize some of the results obtained, all with a more user-friendly interface. But the software is still unstable and under development, and many modifications and improvements are still to be made before it can really be used by everyone. Furthermore, even though many of the features of the original version of PAMHyR are already available (see 3.1 page 3), there are still many to be added to make Pamhyr2 a complete, useful and fully functional piece of software.
 ACKNOWLEDGEMENTS
 TODO citer PITI
 The authors thank Sylvain Coulibaly for his preparatory work and his technical choices.