Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-283
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model description paper
15 Dec 2016
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
Itzï (version 16.8): An open-source, distributed GIS model for dynamic flood simulation
Laurent Guillaume Courty1,2, Adrián Pedrozo-Acuña1, and Paul David Bates3 1Instituto de Ingeniería, Universidad Nacional Autónoma de México, Ciudad de México, 04510 México
2Programa de Maestria y Doctorado en Ingeniería, Universidad Nacional Autónoma de México, Ciudad de México 04510 México
3School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, UK
Abstract. Worldwide, floods are acknowledged as one of the most destructive hazards. In human-dominated environments, their negative impacts are ascribed not only to the increase in frequency and intensity of floods but also to a strong feedback between the hydrological cycle and anthropogenic development. In order to advance a more comprehensive understanding of this complex interaction, this paper presents the development of a new open-source tool named Itzï that enables the 2D numerical modelling of rainfall-runoff processes and surface flows integrated with the open-source Geographic Information System (GIS) software known as GRASS. Therefore, it takes advantage of the ability given by GIS environments to handle datasets with variations in both temporal and spatial resolutions. Furthermore, the presented numerical tool can handle datasets from different sources with varied spatial resolutions, facilitating the preparation and management of input and forcing data. This ability reduces the pre-processing time usually required by other models. Itzï uses a simplified form of the Shallow Water Equations, the damped partial inertia equation, for the resolution of surface flows, and the Green-Ampt model for the infiltration. The source code is now publicly available online, along with complete documentation. The numerical model is verified against three different tests cases: firstly, a comparison with an analytic solution of the Shallow Water Equations is introduced; secondly, a hypothetical flooding event in an urban area is implemented, where results are compared to those from an established model using a similar approach; and lastly, the reproduction of a real inundation event that occurred in the city of Kingston upon Hull, U.K., in June 2007, is presented. The numerical approach proved its ability at reproducing the analytic and synthetic test cases. Moreover, simulation results of the real flood event showed its suitability at identifying areas affected by flooding, which were verified against those recorded after the event by local authorities

Citation: Courty, L. G., Pedrozo-Acuña, A., and Bates, P. D.: Itzï (version 16.8): An open-source, distributed GIS model for dynamic flood simulation, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-283, in review, 2016.
Laurent Guillaume Courty et al.
Laurent Guillaume Courty et al.

Data sets

Itzï version 16.8
L. Courty
doi:10.5281/zenodo.60026
Laurent Guillaume Courty et al.

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This paper presents Itzï, a new open-source software for the simulation of floods. It is integrated with a Geographic Information System (GIS), which reduces the human time necessary for preparing the entry data and analysing the results of the simulation. Itzï uses a simplified numerical scheme that permits to obtain results faster than other types of models using more complex equations. In this article, Itzï is tested with three cases that shows its suitability to simulate urban floods.
This paper presents Itzï, a new open-source software for the simulation of floods. It is...
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