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River modellers quite often require support to incorporate their custom models into existing tools. The Source Integrated Modelling System (Source IMS) is a modelling and simulation software which allows users to directly integrate complicated expressions into its GUI-based software. Source IMS is a new generation river system modelling software package for operational and planning purposes in regulated and unregulated river systems developed by the eWater Cooperative Research Centre. One of the key technical user requirements for this software package is a framework that allows users to import customised model functionality into the Source IMS, including the user interface, via the use of plug-ins. The Source IMS allows the use of programming languages supported by the Microsoft .NET Framework to write algorithms that are executed at each time step. The Expression Editor is a GUI-based tool within the Source IMS that provides the ability to enter an equation to calculate variables such as flow volumes, capacities, losses, gains fferent river system and water demands for dicomponents. The Expression Editor allows users to separately calculate the sub-components of the main expression. This enables the use of circular references, which are commonly used in numerical modelling. Within the Expression Editor, Custom Functions can be called with the ability to accept multiple variables and parameters as objects to be used during calculation. The variables and parameters can be sourced directly from the user, calculated at each time step via expressions and/or taken from a component of the simulation. Numerical programming techniques are available using the Custom Functions plug-ins. These include the use of multi-dimensional arrays, loops, and mathematical and logical operators and functions. In addition, building the plug-ins using Visual Studio 2010 provides a platform for user-friendly debugging methods. Plug-ins, therefore, represent a powerful mechanism for end users to customise the behaviour of the system and incorporate new scientific knowledge and modelling methods. Source Rivers, which is a scenario mode of Source IMS designed to support planning and operational aspects of river system management, is used to demonstrate the Custom Functions. The daily Rainfall-Runoff (RR) model, Ge´nie Rural a` 4 parame`tres Journalier (GR4J), is imported as a series of Custom Functions in a plug-in written in the programming language, C#. The final expression requires seventeen input variables to calculate inflow at each time step. Eight of these variables are dependent on the previous time step’s values in the calculations, requiring circular references in the algorithm. Including GR4J RR model inputs as Custom Functions within Source Rivers makes it suitable for stand-alone applications without dynamic linking with the Source IMS catchment scenarios.

Providing flexibility in GUI-based river modelling software: Using Expression Editors and plug-ins to create Custom Functions in Source IMS