九州北西部唐津湾の底質

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More than 70 bottom sediment samples were collected from Karatsu Bay, northwestern Kyushu in 1977, by the R/V "GENKAI" of the Fukuoka Fishery Experiment Station of Fukuoka Prefecture. The surface sediments of Karatsu Bay are classified into sand, muddy sand and gravelly sand based on the ratios of gravel, sand and mud, The distribution pattern of the sediments is well illustrated by the contoured map of median diameter. The finer sediments ( >3φ)mainly occur in the area off the mouth of the Matsuura River and off the Kamuri Habor and its westward. The coarser sediments ( < 1φ) cover the area extends through the center of the bay from Kushizaki and around the Himeshima Island. Five types of the sediments were distinguishable in the bottom sediments of Karatsu Bay, based on the grain-size distribution. The sandy sediments classified as Type II and IIa were widely distributed in the bay. The muddy sediments of Type III and IIIa were found in the Kamuri Habor and near the mouth of the Matsuura River. The gravelly sediments of Type v were distributed around around the small islands and shoals. The contents of calcium carbonate in the sediment samples range from 3.03% to 59.52% with a mean of 19.96%. Types II and V sediments contain high percentage of calcium carbonate. The mean amount of contents of organic carbon, nitrogen and hydrogen in 29 sediment samples are 0.40%, 0.034% and 0.15% respectively. In general, the Type III and III a sediments have a large quantity of these constituents. Ratios of organic carbon to nitrogen of the sediment samples range from 3.33 to 35.00. The high value of ratio of C/N is probably attributable to the presence of the fine fragments of coal which were discharged from the coal-mines worked along the Matsuura River.
長崎大学教育学部の論文
1988-02-29

九州北西部唐津湾の底質

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