海底堆積物の組成から見た長崎港内と付近の錨地特性について

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  • Characteristic for Anchorage in Nagasaki Port from the Classification of Sediment

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<p>This study was carried out focused on relationship between anchorage characteristic and classification sediments including moisture content (hereinafter referred to as "moisture content") in order to prevent marine accidents caused by dragging anchors under strong winds. Total 35 seabed sediments were collected at inside or nearby Nagasaki Port using a Smith-McIntyre Bottom sampler onboard the Kakuyo Maru, a training ship of the Faculty of Fisheries, Nagasaki University. The bottom sediment was classification based on the sediment symbol on the nautical chart, and one sample was extracted from each category to obtain the moisture content. Furthermore, the maximum holding force was measured using three types of model anchors: JIS type and Danforth type. As a result, the sediments were roughly divided into four groups and almost station was Si-fS based on the grain size composition of sediment. Moisture content was ranged from 21% to 47% and became larger around the quarantine anchorage area. The model anchor experiment showed that average holding coefficient of the Danforth anchor became more than 10 at St.1 and St.35, but JIS type anchor average holding coefficient was less than 4 at all stations even in regardless of the moisture content.</p>

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