Time variability of hydrodynamics and potential use of surface water and ocean topography mission in estuarine macrotidal system: example of Seine estuary
| Autor: | Laetitia Chevalier, Imen Turki, Florent Lyard, Christinte Lion, Benoit Laignel |
|---|---|
| Přispěvatelé: | Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), University of North Carolina [Chapel Hill] (UNC), University of North Carolina System (UNC) |
| Rok vydání: | 2018 |
| Předmět: |
Climate pattern
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences 0211 other engineering and technologies Estuary 02 engineering and technology 01 natural sciences Water level Ocean surface topography Oceanography 13. Climate action North Atlantic oscillation General Earth and Planetary Sciences Environmental science 14. Life underwater [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Surface water SWOT analysis [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sea level 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Journal of applied remote sensing Journal of applied remote sensing, Bellingham, WA : SPIE, 2018, 12 (03), pp.036008. ⟨10.1117/1.JRS.12.036008⟩ |
| ISSN: | 1931-3195 |
| DOI: | 10.1117/1.jrs.12.036008 |
| Popis: | (IF 1.34; Q2); International audience; This work was supported by the National Center for Space Studies in the framework of the future mission surface water and ocean topography (SWOT). The estuarine zones with their complex hydrodynamics represent a great challenge for the future SWOT mission. The Seine estuary was selected by the SWOT Science Definition Team for the calibration/validation of the mission. Thus the aim of this study is to investigate the temporal hydrodynamic variability in the Seine estuary and the SWOT ability to reproduce this variability and hydrodynamic phenomena. For this, we used several statistical techniques and frequency analyses applied on the tide-gauge measurements of the Seine estuary and on SWOT simulated data. SWOT samples (SWOT simulated data) have been extracted synthetically from observations using the number of overpasses per repeat cycle [21 days (d)] in order to study the ability of SWOT to reproduce the time variability of the hydrodynamics. Results have demonstrated similar frequencies of multiyear, annual, and intraannual along the estuary from the Seine discharge to the Cherbourg sea level. The 11- to 22-d frequency has been only observed for estuarine and coastal time series suggesting the tide effect in these contexts. The distribution of levels has shown a high influence of tides and discharges at the downstream and the upstream, respectively. Low frequencies of water level are explained by the climate patterns of North Atlantic Oscillation with a mean range of 65%, whereas the high frequencies are associated to the periods of flooding and stormy events. Finally, simulated SWOT samples of water level show a better restitution of observations for high overpasses number. The results have shown a better restitution of hydrodynamic variability by SWOT in the river and upstream of estuary than in the downstream of estuary and coastal zone: in the estuary downstream and the coast, the annual mode is underexpressed while the 3-month (m) mode is overexpressed, which means the annual mode is underestimated and the 3-m mode is amplified by SWOT. |
| Databáze: | OpenAIRE |
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