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• W2144178082 abstract "New models to predict settling velocity and effective density of flocs are proposed. The models are based on the concept of fractal geometry, but with the assumption of variable fractal dimension with the floc size. The best results are obtained when the fractal dimension is estimated by a power law function of the floc diameter. The models are compared with observations from 26 published data sets relating floc size to settling velocity measured under various conditions and at different locations. The floc size covered by the data varies between 1.4 and about 25,500 µm. Five commonly used models are also compared to these data and found to reproduce inadequately the full range of the observations. Sensitivity analysis shows that, with the proposed models, the spread in the data may be reproduced by varying the size of primary particles from about 0.05 to 20 µm. The new models are proposed for integration into numerical models to simulate sediment transport of cohesive sediments, contaminants, and biological microorganisms such as phytoplankton. RESUME Des modeles nouveaux sont proposes pour predire la vitesse de sedimentation et la densite effective des flocs d’argile. Les modeles sont bases sur le concept de geometrie fractale, mais avec l’hypothese de dimension fractale variable avec la taille des flocs. Les meilleurs resultats sont obtenus lorsque la dimension fractale est estimee par une fonction puissance du diametre des flocs. Les modeles proposes sont compares avec les observations provenant de vingt-six series de donnees publiees. Ces dernieres relient la taille des flocs a la vitesse de sedimentation mesuree dans des conditions variees et a des endroits differents. La taille des flocs concernes par les donnees varie entre 1.4 et 25500 µm. Cinq modeles utilises frequemment sont aussi compares a ces donnees et sont apparus inadequats de reproduire les observations. L’analyse de sensitivite montre qu’avec les modeles proposes, les donnees peuvent etre reproduites en variant la taille des particules primaires composant les flocs d’environ 0.05 a 20 µm. Les nouveaux modeles sont proposes pour integration dans les modeles numeriques pour simuler le transport de sediments cohesifs, de contaminants et de microorganismes biologiques comme le phytoplancton." @default.
• W2144178082 created "2016-06-24" @default.
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• W2144178082 date "2006-01-01" @default.
• W2144178082 modified "2023-09-26" @default.
• W2144178082 title "Models for effective density and settling velocity of flocs Models pour la densité effective et la vitesse de sédimentation de flocs" @default.
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