Numerical simulations of tidally cued vertical migrations of flatfish larvae in the North Sea

M. de Graaf, Z. Jager, C.B. Vreugdenhil, M. Elorche

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)

Abstract

A coupled Eulerian–Lagrangian Hybrid Ecological Model was applied to model the transport of flatfish larvae at different scenarios of tidally cued activity. Hydrodynamic data were supplied by a two-dimensional hydrodynamic model of the southern North Sea and were used as input in a Lagrangian particle model in which the flatfish larvae were represented by particles, which responded differently to tidal cues—in this case, hydrostatic pressure. It was used to investigate the interference of vertical migration, in phase with the tidal rhythm, with the specific circulation pattern of the North Sea, by comparison with passive particle advection and diffusion. Instead of what was anticipated after tests in a simple one-dimensional tidal flow, the horizontal advection was not increased, which would allow a greater distance between spawning ground and nursery area. Rather, tidally cued vertical migration turns the direction of transport towards the nearest coast in the North Sea. This is caused by the phase difference between the onshore component of the water velocity and the along-shore component in this area. Tidally cued vertical migration would also be a very efficient mechanism to enter the Wadden Sea through a tidal inlet. The application of the present model looks promising but needs fine-tuning and calibration with real larval distributions and behaviour during the transport phase.
Original languageEnglish
Pages (from-to)295-305
JournalEstuarine, coastal and shelf science
Volume59
Issue number2
DOIs
Publication statusPublished - 2004

Keywords

  • North Sea
  • Numerical modelling
  • Selective tidal stream transport
  • Wadden Sea

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