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MODERNIZATION OF THE GIGNAC CANAL THROUGH MONITORING, REMOTE CONTROL AND AUTOMATIC CONTROL

Congress: 2008
Author(s): Jean-Pierre Baume, José Ribot-Bruno, Vincent Kulesza
Mr. Jean- Pierre BAUME Mr. José RIBOT-BRUNO Address: Cemagref, 361, rue JF Breton – BP 5095 – 34196 MONTPELLIER Cedex 5 – France Mr. Vincent KULESZA Address: ASA du Canal de Gignac – 1 Parc de Camalcé – 34150 GIGNAC – France

Keyword(s): irrigation, canal, modeling, control, automation, SCADA, GIS
AbstractThe Gignac canal is the main work of an irrigated area managed by the "ASA du canal de Gignac", and was built in 1890. It is located about 35 km west from Montpellier. The resource comes from an off-take in the Hérault River, which has a very pronounced Mediterranean regime, with severe lows in summer. The main canal is 50 km long, with a common trunk (8 km) and two branches on the left and right banks of the river (resp. 27 and 15 km). A program for a global modernisation of the canal is on the way and the irrigated perimeter is representative of the changes and issues that ancient works have to deal with. A scientific project, designed in 2000 has been lead by Cemagref, aiming at modernizing the main canal hydraulic management and at using the facilities as an experimental lab for automatic control algorithm tests. The project consisted mainly of building a SCADA system on the canal, enabling remote manual or local and global automatic control. It has been designed to make possible the test of a wide range of control architectures and algorithms. Level and flow sensors have been installed on the whole main canal. On the common trunk and on the right bank, gates have been modernised and motorised, allowing the control of a four reach system. The canal is used for experiments in the fall-winter periods, when there is no demand for water. The new equipment will also help the canal manager facing strengthening constraints: - Strict application of new laws which lead to diminish off-takes possibilities, - Modernization of parts of the secondary network by replacement of open channels by pressure pipes. The paper will present the technical features of the project including the motorized gates and several types of sensors, the SCADA system, the GIS and the real time interface to the SIC hydrodynamic model. Several uses of them will be illustrated such as automatic adjustment of a hydrodynamic model from real time data, automatic calibration, local automatic control and global automatic control. The Gignac canal can be seen as a pilot project following a modernization process that will be followed by more and more irrigation canals worldwide due to the increasing pressure on water savings, safety constraints and quality of service to users.
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