Diffusion and sedimentation of suspended particles in the Seto Inland Sea

概要

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Measurement of the vertical distribution of total suspended matter (TSM) was carried out during summer throughout the Seto Inland Sea. TSM concentration near the bottom is influenced significantly by water movement and turbid bottom water is observed in all areas where median grain size (Mdφ) of the bottom sediment is more than 4φ. The high concentration of TSM near the bottom may be due to resuspension of the surface layer of bottom sediments.We designed the special apparatus to measure the settling velocity of suspended particles in the sea. By using the apparatus, in situ measurements were carried out in Harima-Nada of the Seto Inland Sea. The settling velocity of the particles ranges from 8×10-3 cm s-1 to 2×10-1 cm s-1 and increases with particle diameter. The apparent density of the particles ranges from 1.38 to 1.03 and decreases with increasing particle diameter.
日本堆積学会の論文