Circulation and suspended sediment transport in a coral reef lagoon: The south-west lagoon of New Caledonia
|Author(s)||Ouillon S.1, 2, Douillet Pascal3, Lefebvre J. P.3, Le Gendre Romain4, Jouon Aymeric5, Bonneton P.5, Fernandez 4, Chevillon C.4, Magand O.6, Lefevre J.4, Le Hir Pierre7, Laganier R.8, Dumas Franck7, Marchesiello P.1, 4, Madani A. Bel9, Andrefouet S.4, Panche J. Y.4, Fichez R.3|
|Affiliation(s)||1 : Univ Toulouse, UPS OMP PCA, LEGOS, F-31400 Toulouse, France.
2 : LEGOS, IRD, F-31400 Toulouse, France.
3 : UAM, IRD, Dpt Hidrobio, Div Ciencas Bio & Salud, Mexico City 09340, DF, Mexico.
4 : IRD Noumea, Noumea 98848, New Caledonia.
5 : Univ Bordeaux, CNRS, UMR 5805, F-33000 Bordeaux, France.
6 : Univ Grenoble 1, LGGE, CNRS, F-38402 St Martin Dheres, France.
7 : IFREMER, DYNECO PHYSED, F-29280 Plouzane, France.
8 : Univ Paris Diderot Paris 7, F-75205 Paris 13, France.
9 : Inst Mar Peru, IRD, IMARPE CIMOBP, Callao, Peru.
|Source||Marine Pollution Bulletin (0025-326X) (Pergamon-elsevier Science Ltd), 2010 , Vol. 61 , N. 7-12 , P. 269-296|
|WOS© Times Cited||81|
|Keyword(s)||Hydrodynamics, Suspended sediment, New Caledonia, Coral reef lagoon, Sediment, Turbidity, Resuspension|
|Abstract||The south-west lagoon of New Caledonia is a wide semi-open coral reef lagoon bounded by an intertidal barrier reef and bisected by numerous deep inlets. This paper synthesizes findings from the 2000-2008 French National Program EC2CO-PNEC relative to the circulation and the transport of suspended particles in this lagoon. Numerical model development (hydrodynamic, fine suspended sediment transport, wind-wave, small-scale atmospheric circulation) allowed the determination of circulation patterns in the lagoon and the charting of residence time, the later of which has been recently used in a series of ecological studies. Topical studies based on field measurements permitted the parameterisation of wave set-up induced by the swell breaking on the reef barrier and the validation of a wind-wave model in a fetch-limited environment. The analysis of spatial and temporal variability of suspended matter concentration over short and long time-scales, the measurement of grain size distribution and the density of suspended matter (1.27 kg 1(-1)), and the estimation of erodibility of heterogeneous (sand/mud, terrigenous/biogenic) soft bottoms was also conducted. Aggregates were shown to be more abundant near or around reefs and a possible biological influence on this aggregation is discussed. Optical measurements enabled the quantification of suspended matter either in situ (monochromatic measurements) or remotely (surface spectral measurements and satellite observations) and provided indirect calibration and validation of a suspended sediment transport model. The processes that warrant further investigation in order to improve our knowledge of circulation and suspended sediment transport in the New Caledonia lagoon as well as in other coral reef areas are discussed, as are the relevance and reliability of the numerical models for this endeavour.|