Anomalous distribution of suspended matter and some chemical compositions in seawater near the seabed: Transport processes |
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| Authors: | Masahiro Kajihara Katsuhiko Matsunaga Yoshiaki Maita |
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| Institution: | (1) Research Institute of the North Pacific Fisheries, Faculty of Fisheries, Hokkaido University, Japan;(2) Department of Chemistry, Faculty of Fisheries, Hokkaido University, Minato, Hakodate, 040 Hokkaido, Japan |
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| Abstract: | Vertical fine distributions of suspended matter and some chemical compositions in seawater were measured in the layer near the seabed. Distributions of organic suspended matter were almost uniform throughout the layer, but others were anomalous. However, with respect to their peak heights and distribution patterns, the tendency of profiles was the same on the whole. We suggested that these anomalous distributions were primarily caused by the destruction of the large flocculent particle on the seabed and by upward diffusion of disintegrated particles. The similarity of profiles between chemical compositions of dissolved substances and suspended matter of non-dissolved substances, was explained by assuming that pore water in the large particle was simultaneously transported with disintegrated particles after the destruction. An equation for the vertical distribution of suspended matter near the seabed was derived, provided that the rate of destruction of large flocculent particle was in proportion to the current velocity on the seabed. The equation represented the existence of the anomalous distribution, which was continuously changing its pattern. Measurements of vertical profiles of suspended matter showed almost the same tendency with the theory. From the characteristics of the theoretical equation, it was expected that the eddy diffusivity near the seabed was 10 50 cm2/sec. |
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