大阪湾における懸濁粒子の堆積過程

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A metrologied survey and observation of the sedimentation distribution and the structure of the particulate matters (suspended particles) in the Osaka Bay has been made. Relatively high sedimentation rates were noticed around the central part of the bay rather than in the inner part of the bay where a large amount of the particulate matters are incessantly supplied from the Yodo River, one of the largest rivers in the Kansai District in Japan. From the estimation of mass balance for particulate matters in the bay, it is explained that 77% of the total yearly sedimental load is comprised of the particulate matters supplied by non-stationary phenomena including floods. It is imagined that the sedimentation rate is governed by such a large amount of the particulate matters and also imagined that the distribution of the sedimentation is likewise governed by an tidal current upon the behavior of river-forced estuarine plumes, which is remarkably different from a steady state tidal current. Very few difference of the organic carbons and heavy metal elements is exhibited in the total sedimental load in the central part of the bay or in the western seacoast district where the concentration of these elements is not so high and in the head of the bay where the concentration is very high. That is to say, it is indicated that these elements loaded in the bottom of the Osaka Bay spread in the whole area of the bay and are accumulated as sediments. With these facts, there is a possibility that erroneous judgment will be made when the transportation mechanism of the matters is considered. It is implied that the information concerning the sedimentation rate should concurrently be considered.
日本海洋学会の論文
1994-12-30

大阪湾における懸濁粒子の堆積過程

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