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Examples of spatial and temporal variations of some fine-grained suspended particle characteristics in two Danish coastal water bodies ArchiMer
Mikkelsen, Oa.
In June and September of 1999, a LISST-100 in situ laser diffraction particle sizer was used to analyse the temporal and spatial variation of the beam attenuation coefficient, the in situ median particle (aggregate) diameter and the median volume concentration of suspended matter in two Danish coastal water bodies. One of the study sites was generally exposed to wind, while the other was quite sheltered. Measurements of the mass concentration of total suspended matter and chl a were made simultaneously. The in situ median effective density, settling velocity and vertical flux of the suspended matter are computed. Results demonstrate that in September, the in situ median aggregate diameter, settling velocity and vertical flux was smaller (by a factor of up...
Tipo: Text Palavras-chave: Agrégation; Diffraction laser; Spectre de taille des particules; Dimension fractale; Vitesse de sédimentation; Aggregation; Laser diffraction; Particle size spectra; Fractal dimension; Settling velocity.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43328/42899.pdf
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Use of a disjunctive kriging to model areas of high pelagic fish density in acoustic fisheries surveys ArchiMer
Petitgas, Pierre.
Schooling fish may aggregate in very high densities covering very small areas. Thus the probability of hitting such high-density spots during a large-scale sampling is very low. The sampling fluctuations of the tail of the histogram are thought to be very significant. The stock biomass estimate and its precision rely greatly on how precisely the tail of the histogram can be sampled. In order to acquire elements for improving survey designs and abundance estimators wc study here the relation in space that the high values have with the other values. A disjunctive kriging approach is used. Different quantiles of the histogram are coded by indicators. The spatial structure of each indicator and its spatial covariation with the others are studied by computing...
Tipo: Text Palavras-chave: Distribution spatiale; Agrégation; Abondance; Estimation; Géostatistique; Échantillonnage; Spatial distribution; Aggregation; Abundance estimation; Geostatistics; Sampling.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00190/30076/28564.pdf
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