Reference : A drifting GPS buoy for retrieving effective riverbed bathymetry
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/10993/19007
A drifting GPS buoy for retrieving effective riverbed bathymetry
English
Hostache, R. [CRP Gabriel Lippmann]
Matgen, P. [CRP Gabriel Lippmann]
Giustarini, L. [CRP Gabriel Lippmann]
Teferle, Felix Norman mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Tailliez, C. [CRP Gabriel Lippmann]
Iffly, J.-F. [CRP Gabriel Lippmann]
Corato, G. [CRP Gabriel Lippmann]
2014
Journal of Hydrology
0
-
Yes (verified by ORBilu)
International
0022-1694
[en] Global Navigation Satellite System (GNSS) ; Global Positioning System ; Water Surface Elevation ; Effective Bathymetry ; Hydrodynamic modeling ; Data assimilation
[en] Spatially distributed riverbed bathymetry information are rarely available but mandatory for accurate hydrodynamic modeling. This study aims at evaluating the potential of the Global Navigation Satellite System (GNSS), like for instance Global Positioning System (GPS), for retrieving such data. Drifting buoys equipped with navigation systems such as GPS enable the quasi-continuous measurement of water surface elevation, from virtually any point in the world. The present study investigates the potential of assimilating GNSS-derived water surface elevation measurements into hydraulic models in order to retrieve effective riverbed bathymetry. First tests with a GPS dual-frequency receiver show that the root mean squared error (RMSE) on the elevation measurement equals 30 cm provided that a differential post processing is performed. Next, synthetic observations of a drifting buoy were generated assuming a 30 cm average error of Water Surface Elevation (WSE) measurements. By assimilating the synthetic observation into a 1D-Hydrodynamic model, we show that the riverbed bathymetry can be retrieved with an accuracy of 36 cm. Moreover, the WSEs simulated by the hydrodynamic model using the retrieved bathymetry are in good agreement with the synthetic ‘‘truth’’, exhibiting an RMSE of 27 cm.
Fonds National de la Recherche - FnR
Researchers ; Professionals
http://hdl.handle.net/10993/19007
10.1016/j.jhydrol.2014.11.018
http://www.sciencedirect.com/science/article/pii/S0022169414009238

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