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Simulation of suspended particulate matter transport in the Gulf of Gdansk during 1996

100%

Brandke K.

vol. 26

issue 4

123-132

The initial results of modelling of suspended matter (SPM) concentration are presented. The three-dimensional model proposed allows one to calculate the transport, erosion and deposi-tion of a mineral part of seston in the Gulf of Gdansk. The loads of SPM from rivers, atmosphere and the open sea, based on either real data or other model simulations, are included. In this model, the settling velocity of seston particles is assumed to be proportional to the Stokes' one computed for particles of 4 mm in diameter. Erosion and deposition rates depend on the bed shear velocity computed from hydrodynamic model. Results of computations corresponding to a period of one year are compared with in situ ob-servations carried out in the 1996 year and satellite data. In general, horizontal and vertical distri-butions of mineral SPM concentration computed from the model show a characteristic for this area pattern of water turbidity, however, quantitatively the results obtained are in rather poor accordance with real values.

Temporal and spatial variations in particle concentrations and size distributions in the Gulf of Gdansk

51%

Brandke K., Latala A., Czabanski P.

vol. 26

issue 2-3

39-59

Measurements of suspended particle (diameter in the 4-30 mum range) concentrations and their sizes (using a Multisizer II Coulter Counter) carried out in the Gulf of Gdansk from May 1992 to December 1993 were used for studies of the temporal and spatial variability of particle size distributions. The quantity of suspended particles in Puck Bay waters was characteristically less variable both in the vertical and in the horizontal than was the open Gulf of Gdansk, which is influenced to some extent by the waters of the river Vistula. In Puck Bay, surface particle concentrations were usually in the range 1.6?103-1.0?104 cm-3, in the open Gulf of Gdansk they were 1.6?103-2.0?104 cm-3. The Vistula strongly influenced the concentration of larger particles and the shape of the particle size distribution curves just off the river mouth. The particle size distribution curves characteristic of the Gulf of Gdansk display, in general, the hyperbolic shape typical of marine suspensions. In waters with a relatively high concentration of particles, some additional increase in particle number in the diameter range of 10-20 ?m or just below 10 mum was recorded. During the year, three periods of maximum particle concentrations occurred. Two of them, in spring and autumn, were found to be related to maximum chlorophyll a concentrations. The best correlation between particle numbers and chlorophyll a content was found for particles with diameter D more than 10 mum for two classes of suspensions: with high (r=0.88) and low (r=0.82) particle concentrations occurring in the presence of the same chlorophyll a concentration.

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2 Oceanological Studies

2 1997

2 Brandke K.

1 Czabanski P.

1 Latala A.

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Simulation of suspended particulate matter transport in the Gulf of Gdansk during 1996

Temporal and spatial variations in particle concentrations and size distributions in the Gulf of Gdansk