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La gestion dynamique des relations hauteur-débit des stations d’hydrométrie et le calcul des incertitudes associées : un indicateur de gestion, de qualité et de suivi des points de mesure

Thèse de Thomas MORLOT soutenue le 01 octobre 2014

par Brice Boudevillain - 22 décembre 2016

Encadrants : Anne-Catherine FAVRE et Christian PERRET (EDF/DTG)

Dynamic rating curve assessment in hydrometric stations and calculation of the associated uncertainies : quality and monitoring indicators

Whether we talk about safety reasons, energy production or regulation, water resources management is one of EDF’s main concerns. To meet these needs, EDF-DTG operates a hydrometric network that includes more than 350 gauging stations. The data collected allows real time monitoring of rivers, as well as hydrological studies and sizing of structures. Ensuring the quality of the stream flow data is a priority.

A rating curve is an indirect method of estimating the discharge in rivers based on water level measurements. The value of the discharge obtained is not entirely accurate due to the constant changes of the measuring section, to the gauging precision and to the quality of the tracing. As time goes on, the uncertainty of the estimated discharge from a rating curve « gets older » and increases : therefore the level of uncertainty remains particularly difficult to assess.

Moreover, the current capacity to produce a rating curve is not suited to changes of the stage-discharge relationship : it does not take into consideration the variation of the flow conditions and the modifications of the measuring sections which occur due to natural processes such as erosion and sedimentation.

Therefore, in order to get the most accurate data flow possible and to improve the reliability of the data flow in particular when it comes to surveillance, this study will undertake an original « dynamic » method to draw the rating curves based on historical facts from a gauging station. A new curve will be traced at each new gauging and will be given a level of uncertainty taking into account the inaccuracies in the measurement of the height, the sensitivity of the station, the quality of tracing and a variographic analysis allowing for the evolution of the reliable range. These rating curves will enable us to give a value of stream flow at each time step taking into account the variability of flow conditions, the life of the station, while providing a model of uncertainties.

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