Please cite this article as: Leandro, J., Chen, A.S., Schumann, A., A 2D Parallel Diffusive Wave Model for floodplain inundation with variable time step (P-DWave), Journal of Hydrology (2014), doi: http://dx.doi.org/10. 1016/ j.jhydrol.2014.05.020 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Growing advances in remote sensing technologies together with the widespread availability of 11 Digital terrain models (DTM) have intensified the research into two-dimensional (2D) models. 12Supported by detailed DTM, 2D models can become very accurate tools yet not without an added 13 cost on the computational effort. Floodplain inundation is characterized by a slow varying 14 phenomenon which can last hours, days or even weeks. In this paper we aim to develop a specific 15 parallel diffusive wave model with variable time step suitable for flood inundation. Taking advantage 16 of up to 12 processors, speed-up times ranging from 1.7 to 5.2 and 1.2 to 1.7 are achieved with the 17 Matlab parallel computing toolbox and Fortran OpenMP Application Programming, respectively. The 18 variable time method and the process devised to represent Wet-Dry fronts kept the solution stable 19 and preserved absolute mass conservation. P-DWave performed well against known analytical 20 solutions and dynamic and diffusive models in a total of seven tests. 21
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