FN Archimer Export Format
PT J
TI Effects of short flexible seagrass     Zostera noltei     on flow, erosion and deposition processes determined using flume experiments
BT 
AF GANTHY, Florian
   SOISSONS, Laura
   SAURIAU, Pierre-Guy
   VERNEY, Romaric
   SOTTOLICHIO, Aldo
AS 1:1,2,3;2:2;3:4;4:1;5:2;
FF 1:PDG-ODE-LITTORAL-LERAR;2:;3:;4:PDG-ODE-DYNECO-PHYSED;5:;
C1 IFREMER, Dept Dynam Environm Cotier, Equipe PHYSED, F-29280 Plouzane, France.
   Univ Bordeaux, CNRS, EPOC, F-33615 Pessac, France.
   IFREMER, LER AR, F-33120 Arcachon, France.
   Univ La Rochelle, CNRS, Littoral Environm & Soc LIENSs, F-17000 La Rochelle, France.
   Royal Netherlands Inst Sea Res NIOZ Yerseke, Spatial Ecol Dept, AC Yerseke, Netherlands.
C2 IFREMER, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
   UNIV LA ROCHELLE, FRANCE
   INST SEA RESEARCH (NIOZ), NETHERLANDS
SI ARCACHON
   BREST
SE PDG-ODE-LITTORAL-LERAR
   PDG-ODE-DYNECO-PHYSED
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.216
TC 35
UR https://archimer.ifremer.fr/doc/00244/35507/34011.pdf
   https://archimer.ifremer.fr/doc/00244/35507/34016.pdf
LA English
DT Article
BO Planula IV
DE ;Arcachon Bay;flexible vegetation;flow modification;flume experiments;France;sediment resuspension;sediment trapping;Zostera noltei
AB Innovative flume experiments were conducted in a recirculating straight flume. Zostera noltei meadows were sampled in their natural bed sediments in the field at contrasting stages of their seasonal growth. The aims of this study were: (i) to quantify the combined effects of leaf flexibility and development characteristics of Zostera noltei canopies on their interaction with hydrodynamics; and (ii) to quantify the role of Zostera noltei meadows in suspended sediment trapping and bed sediment resuspension related with changes in hydrodynamic forcing caused by the seasonal development of seagrasses. Velocity within the canopy was significantly damped. The attenuation in velocity ranged from 34 to 87% compared with bare sediments and was associated with a density threshold resulting from the flow-induced canopy reconfiguration. The reduction in flow was higher in dense canopies at higher velocities than in less dense canopies, in which the reduction in flow was greater at low velocities. These contrasted results can be explained by competition between a rough-wall boundary layer caused by the bed and a shear layer caused by the canopy. The velocity attenuation was associated with a two to three-fold increase in bottom shear stress compared with unvegetated sediment. Despite the increase in near-bed turbulence, protection of the sediment against erosion increased under a fully developed meadow, while sediment properties were found to be the main factor controlling erosion in a less developed meadow. Deposition fluxes were higher on the vegetated bed than on bare sediments, and these fluxes increased with leaf density. Fewer freshly deposited sediments were resuspended in vegetated beds, resulting in an increase in net sediment deposition with meadow growth. However, in the case of a very high leaf area index, sediment was mostly deposited on leaves, which facilitated subsequent resuspension and resulted in less efficient sediment trapping than in the less developed meadow. 
PY 2015
PD JUL
SO Sedimentology
SN 0037-0746
PU Wiley-blackwell
VL 62
IS 4
UT 000354564200002
BP 997
EP 1023
DI 10.1111/sed.12170
ID 35507
ER

EF