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＜紀要論文＞
福岡県津屋崎沖の底質
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| 概要 | The surveyed sea-area (Fig. 1) is a part of the Genkainada sea, about 15 km off the coast of Tsuyazaki to the northeast of the city of Fukuoka. The field work was undertaken in the spring of 1961. Thi...s paper primarily presents the results of the study of the bottom sediments, which may be briefly summarized as follows: 1. There are various kinds of coastal configuration, such as capes, sea-cliffs, sea-caves, sea-arches, stacks, sand-bars, sand-spits, sand-beaches and land-tied islands, on the background of this area. There are five islands in the surveyed sea-area. Some of them are aligned with small rocky submarine basements to the cape. The area may be divided into three parts by these lines of islands and rocks; one is Kuraraseto straits placed between Oshima island, and Jinoshima island and Katsushima islet. Another is Konominato-ura bight surrounded by two islands of Jinoshima and Katsushima, and two capes of Kusazaki and Kanenomisaki. Another is the main part of this surveyed sea-area, surrounded by two islands of Ainoshima and Oshima, and Kyushu. There are two submarine terraces of different levels on the main part. The shallower is 10-20 m in depth, and the deeper one is over 35 m in depth. The former is formed by the deposition at the recent sea level. The latter was probably formed at the latest period of Wiirm glacial age, although it may be partly overlain by recent fine-grained sediments (Fig. 2). 2. The constant current of the surveyed sea-area flows from northeast to southwest and its speed is about 0.2 knot. This current is the opposite flow of the Tsushima warm current. The tidal current flows from southwest to northeast at the speed of 0.6-0.9 knot at the full tide of Hakata Port in the Fukuoka bay. But it flows from northeast to southwest at nearly same speed at the low tide of Hakata Port (Figs. 3 and 4). 3. Bottom sediments dredged from 32 stations in the surveyed area are characterized by a large amount of fine-grained sands with a small or some amounts of gravels, coarseand medium-sands and no appreciable muddy sediments. The bottom of this surveyed sea-area is predominantly occupied by well-sorted fine sand. Coarse sand is distributed on two parts separately; one is along the coast between Tsuyazaki and Shingu, the other is off the Ainoshima island. Medium sand is distributed near Oshima island and the northeast of Ainoshima island. The Kuraraseto straits and some parts of Konominato-ura are characterized by many exposures of rocky basements (Figs. 5 and 6).続きを見る |
| 目次 | 付録1 第2表津屋崎沖定点での底棲有孔虫群の優占種 付録2. 津屋崎沖の浮瀞性有孔虫遺骸の分布[日高稔] 付録3. 津屋崎沖の底棲動物分布[菊池泰二] 付録4. 津屋崎沖の海底堆積物中の重鉱物組成表[岡田博有] |
詳細
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| 登録日 | 2021.11.26 |
| 更新日 | 2023.11.15 |