Stratification and Tidal Current Effects on Larval Transport in the Eastern English Channel: Observations and 3D Modeling
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We study how the combination of tides and freshwater buoyancy affects the marine organisms accumulation and horizontal transport in the ROFI system of the eastern English Channel. The Princeton Ocean Model coupled with a particle-tracking module is used to study the migration of fish eggs and larvae under different forcing conditions. Results of modeling are validated against observed concentrations of Flounder (Pleuronectes flesus) larvae. Numerical Lagrangian tracking experiments are performed with passive and active particles, representing sea-water organisms. Passive particles are neutrally buoyant whereas active particles are able to exercise light dependent vertical migrations equating to the swimming behavior of larvae. The experiments reveal that the strongest accumulation of particles occurs along the French coast on the margin of the ROFI. This happens because the interaction between the turbulence, the freshwater buoyancy input, and tidal dynamics, produces particle trapping and vertical spreading within the frontal convergence zone. Tides and freshwater input induce net alongshore horizontal transport toward the North. Tidal currents modulate the magnitude of horizontal transport whereas the fresh water input controls more the location of accumulation zones. Tracking experiments with active particles indicate that the vertical migration leads to a significant departure from the passive particle transport pattern. Differences lie in the shape of the particle transport pattern and the rate of the northward migration. In particular, vertically migrating particles travel slower. To find possible Flounder migration pathways, particles are released within the assumed spawning area of Flounder. The model predicts larvae drift routes and demonstrates that throughout the entire particle-tracking period the horizontal structure of the particle distribution is consistent with the larvae concentrations observed during the field experiments.
Signell, R.P. and Geyer, W.R.: 1990, Numerical simulation of tidal dispersion around a coastal headland. In: Residual Currents and Long Term Yransport in Estuaries and Bays, Coastal Estuarine Stud. 38, 210–222, Springer-Verlag, New York.
Brown, C.A., Jackson, G.A. and Brooks, D.A.: 2000, Particle transport through a narrow tidal inlet due to tidal forcing and implications for larval transport, J. Geophys. Res. 105(C10), 24141–24156.CrossRef
Jenkins, G.P., Black, K.P. and Keough, M.J.: 1999, The role of passive transport and the influence of vertical migration on the pre-settlement distribution of a temperate, demersal fish: numerical model predictions compared with field sampling. Mar. Ecol. Progr. Ser. 184, 259–271.
Jenkins, G.P., Black, K.P. and Hamer, P.A.: 2000, Determination of spawning areas and larval advection pathways for King George whiting in south-eastern Australia using otolith microstructure and hydrodynamic modelling, Mar. Ecol. Progr. Ser. 199, 231–242.
Luettich, R.A., Hench, J.L., Fulcher, C.W., Werner, F.E., Blanton, B.O. and Churchill, J.H.: 1999, Barotropic tidal and wind-driven larval transport in the vicinity of a barrier island inlet, Fish. Oceanogr. 8(Suppl. 2), 190–209.
Werner, F.E., Quinlan, J.A., Blanton, B.O. and Luettich, R.A.: 1997, The role of hydrodynamics in explaining variability in fish populations, J. Sea Res., 37, 195–212.CrossRef
Franks, P.J.S.: 1992, Sink or swim: accumulation of biomass at fronts, Mar. Ecol. Prog. Ser. 82, 1–12.
Hill, A.E.: 1994, Horizontal zooplankton dispersal by dial vertical migration in S2 tidal currents on the northwest European continental shelf, Cont. Shelf Res. 14, 491–506.
Bartsch, J.: 1988, Numerical simulation of the advection of vertically migrating herring larvae in the North Sea, Meeresforsch. 32, 30–45.
Foreman, M.G.G.: 1977, Manual for tidal heights analysis and prediction, Pacific Mar. Sci. Rep. 77-10, 66 p.
Prandle, D., Loch, S.G. and Player, R.: 1993, Tidal flow through the Strait of Dover, J. Phys. Oceanogr. 23, 23–37.CrossRef
Blumberg, A.F. and Mellor, G.L.: 1987, A description of a three-dimensional hydrodynamic model of New York harbor region, J. Hydraulic Engin. 125(8), 799–816.
Werner, F.E.: 1995, A field test case for tidally forced flows: A review of the Tidal Flow Forum. In: Quantitative Skill Assessment for Coastal Ocean Models, D.R. Lynch and A.M. Davies (eds). Coastal and Estuarine Studies, 47, 269–283.
Flather, R.A.: 1976, A tidal model of the north-west European continental shelf. Mémoires Soc. Roy. des Sciences de Liège, ser. 6, tome X, 141–164.
Le Provost, C., Lyard, F., Molines, J.M., Genco, M.L. and Rabilloud, F.: 1995, A hydrodynamic ocean tidal model improved by assimilating a satellite-derived data set, J. Geophys. Res. 103(C3), 5513–5529.
Orlanski, I.: 1976, A simple boundary condition for bounded hyperbolic flows, J. Comp. Phys. 21, 251–269.
Monin, A.S. and Yaglom, A.M.: 1965, Statistical hydromechanics, Part I, Nauka, Moscow, 640 p.
Mellor, G.L. and Yamada, T.: 1982, Development of a turbulence closure model for geophysical fluid problems, Rev. Geophys. Space Phys. 20, 851–875.
Grioche, A., Harlay, X., Koubbi, P. and Fraga Lago, L.: 2000, Vertical migration of fish larvae: Eulerian and Lagrangian observations in the eastern English Channel, J. Plankton Res. 22, 1813–1828.CrossRef
Grioche, A., Koubbi, P. and Harlay, X.: 1999, Spatial patterns of ichthyoplankton assemblages along the eastern English Channel French coast during Spring 1995, Estuar. Coastal Shelf Sci 49 141–152.CrossRef
Grioche, A., Koubbi, P. and Sautour, B.: 1997, Ontogenic migration of Pleuronectes flesus larvae in the eastern English Channel, J. Fish Biol. 51(Suppl. A), 385–396.
Korotenko, K.A.: 1994, On the formation of mesoscale anomalies of the matter concentration field in ocean local upwelling zone regions. Oceanology 34(3), 330–338.
Simpson, J.M.: 1997, Physical processes in the ROFI regime, J. Mar. Syst. 12, 3–15.CrossRef
Xie, L. and Eggleston, D.B.: 1999, Computer simulations of wind-induced estuarine circulation patterns and estuary-shelf exchange processes: The potential role of wind forcing on larval transport, Estuar. Coast. Shelf Sci. 49, 221–234.CrossRef
- Stratification and Tidal Current Effects on Larval Transport in the Eastern English Channel: Observations and 3D Modeling
Environmental Fluid Mechanics
Volume 4, Issue 3 , pp 305-331
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- English Channel
- freshwater buoyancy
- larval transport
- particle tracking