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Non-unique stage-discharge relations : Bayesian analysis of complex rating curves and their uncertainties

Abstract : Complex rating curves, with stage and additional variables as inputs are necessary to establish streamflow records at sites where the stage-discharge relation is non-unique. Within the same Bayesian framework, hydraulically-based methods are introduced and tested to develop complex rating curves and estimate their uncertainties: stage-gradient-discharge (SGD) models to address hysteresis due to transient flow, stage-fall-discharge (SFD) models to address variable backwater at twin gauge stations, stage-period-discharge (SPD) model to address net rating changes due to bed evolution. Each model was applied to contrasting hydrometric stations and evaluated through sensitivity analyses. For each of the three sources of non-uniqueness in the stage-discharge relation, the proposed Bayesian methods provide not only quantitative uncertainty analysis but also efficient solutions to recurrent problems with the traditional procedures for complex ratings.
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  • HAL Id : tel-02605323, version 2

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Valentin Mansanarez. Non-unique stage-discharge relations : Bayesian analysis of complex rating curves and their uncertainties. Hydrology. Université Grenoble Alpes, 2016. English. ⟨NNT : 2016GREAU006⟩. ⟨tel-02605323v2⟩

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