Estimating the long-term evolution of river bed levels using hydrometric data
In: E3S Web Conf River Flow 2018: 9th International Conference on Fluvial Hydraulics River Flow 2018: 9th International Conference on Fluvial Hydraulics, Sep 2018, Lyon, France. 8 p., ⟨10.1051/e3sconf/20184006003⟩ E3S Web of Conferences, Vol 40, p 06003 (2018); (2018-09-05)
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River Flow 2018: 9th International Conference on Fluvial Hydraulics, Lyon, FRA, 05-/09/2018 - 08/09/2018; International audience; The stage-discharge measurements and rating curves accumulated over decades at hydrometric stations are a valuable source of information on the long-term evolution of river bed levels. However, the methodology to extract meaningful geomorphic information from such hydrometric data is not straightforward. We introduce an original method to estimate the parameters of successive rating curves by Bayesian analysis in sequence. These parameters reflect the physical properties of the channel features that control the stage-discharge relation: low-flow riffles, main channel, floodway (bars), floodplain, etc. The dates of rating changes are assumed to be known in existing hydrometric records. The uncertainty interval of each parameter is estimated, assuming, however, that no rating change has been ignored by the station manager. It is thus possible to clearly distinguish overall trends of the channel bed level from the local evolution of riffles and to evaluate whether the observed temporal changes are significant compared to the estimation uncertainties.
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Estimating the long-term evolution of river bed levels using hydrometric data
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Autor/in / Beteiligte Person: | Renard, Benjamin ; Mansanarez, Valentin ; Camenen, Benoît ; Jérôme Le Coz ; Hicks, Murray ; Smart, Graeme M. ; Lang, Michel ; RiverLy (UR Riverly) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) ; National Institute of Water and Atmospheric Research [Christchurch] (NIWA) ; University, Stockholm |
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Quelle: | E3S Web Conf River Flow 2018: 9th International Conference on Fluvial Hydraulics River Flow 2018: 9th International Conference on Fluvial Hydraulics, Sep 2018, Lyon, France. 8 p., ⟨10.1051/e3sconf/20184006003⟩ E3S Web of Conferences, Vol 40, p 06003 (2018); (2018-09-05) |
Veröffentlichung: | HAL CCSD, 2018 |
Medientyp: | unknown |
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