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GESREAU : development of tools to use with a geographical database for the management of water resources
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2004
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Zusammenfassung
From the beginning of the 90's, the office for water protection, soils and wastes management (SESA) of the Etat de Vaud (Switzerland), in collaboration with the Laboratory of Hydrology and Land Management of the Swiss Federal Institute of Technology in Lausanne (HYDRAM), undertook the development of a global and integrated water resources management system named GESREAU (see [1]).
This system is based on an ARGIS/Oracle architecture under Unix, with a periodic export to Windows-based PC (ArcView and Access), and is used on an operational basis since 1996.
From summer 2001, a new set of developments was started. The general scope was to provide integrated tools to analyse the hydraulic features of the river network, the hydrological properties of the watersheds, and to link those two kinds of information (see web site in [3]). An upgrade to the latest ESRI products is planned for the end of 2005.
Currently, this system makes it possible to manage 5500 km of rivers and 1200 watersheds digitised from paper maps, several hundreds of cross-sections, etc. The present paper describes the set of engineering tools that has been developed within this framework. The targeted application fields are :
• simple hydraulic studies, on the basis of the Manning-Strickler formula applied to cross sections,
• hydraulic simulations with a widely used model (HEC-RAS), • development and study of longitudinal profiles of rivers,
• the integration of a regionalization method to estimate peak flows in all catchments and sub-catchments,
• determination of the hydrological characteristics of any sub-catchment and their exportation into files to be used by hydrological simulation models.