FN Archimer Export Format
PT J
TI Tidally-induced shear stress variability above intertidal mudflats in the macrotidal Seine estuary
BT 
AF VERNEY, Romaric
   BRUN COTTAN, J
   LAFITE, R
   DELOFFRE, J
   TAYLOR, J
AS 1:1,2;2:3;3:1;4:1;5:4;
FF 1:PDG-DOP-DCB-DYNECO-PHYSED;2:;3:;4:;5:;
C1 Univ Rouen, UMR Morphodynam Continentale & Cotiere 6143, CNRS, F-76821 Mont St Aignan, France.
   IFREMER, DYNECO PHYSED, F-29280 Plouzane, France.
   Univ Caen, UMR Morphodynam Continentale & Cotiere 6143, CNRS, F-14000 Caen, France.
   Univ Sussex, Sch Life Sci, Coastal & Estuarine Res Grp, Brighton BN1 9QJ, E Sussex, England.
C2 UNIV ROUEN, FRANCE
   IFREMER, FRANCE
   UNIV CAEN, FRANCE
   UNIV SUSSEX, UK
SI BREST
SE PDG-DOP-DCB-DYNECO-PHYSED
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 1.124
TC 29
UR https://archimer.ifremer.fr/doc/2006/publication-1887.pdf
LA English
DT Article
DE ;Seine estuary (France);Spatial variability;Neap spring conditions;Intertidal mudflat;Shear stress;Tidal currents
AB Tidal currents and the spatial variability of tidally-induced shear stress were studied during a tidal cycle on four intertidal mudflats from the fluvial to the marine part of the Seine estuary. Measurements were carried out during low water discharge (< 400 m(3) s(-1)) in neap and spring tide conditions. Turbulent kinetic energy, covariance, and logarithmic profile methods were used and compared for the determination of shear stress. The c(TKE) coefficient value of 0.19 cited in the literature was confirmed. Shear stress values were shown to decrease above mudflats from the mouth to the fluivial part of the estuary due to dissipation of the tidal energy, from 1 to 0.2 N m-(2) for spring tides and 0.8 to 0.05 N m(-2) for neap tides. Flood currents dominate tidally-induced shear stress in the marine and lower fluvial estuary during neap and spring tides and in the upper fluvial part during spring tides. Ebb currents control tidally-induced shear stress in the upper fluvial part of the estuary during neap tides. These results revealed a linear relationship between friction velocities and current velocities. Bed roughness length values were calculated from the empirical relationship given by Mitchener and Torfs (1996) for each site; these values are in agreement with the modes of the sediment particle-size distribution. The influence of tidal currents on the mudflat dynamics of the Seine estuary was examined by comparing the tidally-induced bed shear stress and the critical erosion shear stress estimated from bed sediment properties. Bed sediment resuspension induced by tidal currents was shown to occur only in the lower part of the estuary.
PY 2006
PD AUG
SO Estuaries and coasts
SN 1559-2723
PU Estuarine Research Federation
VL 29
IS 4
UT 000240601900010
BP 653
EP 664
ID 1887
ER

EF