Results of field modelling of the process of distribution of suspended matters at bottom dredging
The character of dispersion of fine particles of dredging spoils from the multi-bucket suction dredge operated in the area of the Kerch marine commercial harbour was studied. Measurements of suspended matter loads in jets from an operating suction dredge were made in December 1991. A series of horizontal sections was made from a tug boat at varying distance from the source. Visual evaluation of the amount of suspended matter spreading was made at fixed points. Direction and speed of the surface current were determined from the drift of floats. These parameters were used in modelling of diffusion of conservative impurity -- in this instance, of excessive suspended matter. Surface distribution of suspended matter from the dredge is described and illustrated. Due to the entrainment effect of the main water flow directed south-west during the survey, the suspended matter distribution was stretched out in the same direction. Calculated field offers the possibility to delineate in details the suspended matter influence zone, assuming any boundary concentration. The results can be used in environmental feasibility studies of dredging projects for harborage and approach channels, to evaluate their impact on the marine environment. Using the modelling methods of diffusion processes makes it possible to avoid difficulties associated with field experiments.
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
1994
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| Subjects: | Dispersion, Suspended matter, Surface currents, Marine ecosystems, Dredging, Ports, Diffusion, |
| Online Access: | http://hdl.handle.net/1834/15780 |
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