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The use of open source softwares helps users learn the internal structure of numerical models. However, open source softwares usually require linking to auxiliary programs for data preprocessing, postprocessing, and visualization. The users also have to understand the problem thoroughly, and may at times modify the source code so that the model could better represent the natural mechanisms. | Using open source software to simulate estuarine hydrodynamics Nguyen Quang Chien1 Abstract The use of open source softwares helps users learn the internal structure of numerical models. However open source softwares usually require linking to auxiliary programs for data preprocessing postprocessing and visualization. The users also have to understand the problem thoroughly and may at times modify the source code so that the model could better represent the natural mechanisms. An example of simulation hydrodynamic and morphological change of Tra Khuc estuary in Vietnam with XBeach 1 a 2D hydrodynamic modelling program is presented which will illustrate simple techniques we may apply when using open source programs for modelling shallow flow processes. XBeach is inherently a model for coastal hydrodynamic with dune erosion without modelling the river flow. In order to simulate the effect of river flow to hydrodynamic process and morphological change at the river mouth we consider the implementation of the inflow boundary by editing XBeach program code and handling time scale and morphological factors. A test case is done with the 2005 flood where the model results an irregular pattern of bathymetry change. Model calibration and validation is not addressed in this study. Keywords estuarine hydrodynamics numerical simulation modelling open source software Tra Khuc estuary XBeach. 1. Overview The application of hydrodynamic modelling softwares in the field of coastal and river engineering is ubiquitous nowadays. Several well-known consultant companies or agencies have released their proprietary software packages which have proven their reliability for many real-world applications. Most of those softwares includes easy-to-use graphical interface and various tools together with technical training support offered by the company. From the perspective of researching or academic training however the use of such proprietary software packages has major drawbacks. Aside from a
