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- 中井 達郎
- 国士舘大学
書誌事項
- タイトル別名
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- Physiographic Unit for Understanding the Spatial Structure of the Coral Reef Ecosystem at the Yoron Island Fringing Reef, Ryukyu Islands
- サンゴショウ キョショウ ニ オケル クウカン コウゾウ ハアク ノ タメノ シゼン チリテキ ユニット ノ セッテイ ヨロントウ トウブ サンゴショウ オ レイ ニ
- -与論島東部サンゴ礁を例に-
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The spatial structures of a 101-103 m scale on coral reefs were understood by reading aerial photographs and investigating the topography of the fringing reef at the eastern part of Yoron Island, Ryukyu Islands. This study set a new physiographic unit (PGU) at the coral reefs as well as studied zonation. PGU has the following characteristics. (1) In an aerial photo, a linear pattern comprising micro-landform arrangements is recognized on the reef flat; (2) Seawater flowing beyond the reef crest from the open sea and entering the moat before returning to the open sea through a breakout in the reef crest or a channel flowing parallel to the shoreline constitute a very common pattern in the research area; (3) The series of currents observed in the area constitute a water system resembling a drainage water system on land and 4 systems were arranged at the eastern part of Yoron Island ; (4) The movement of seawater is controlled by landforms such as reef crests, channels and lands (a cape), which might qualify as borders of PGUs ; (5) Movements controlled by such landforms are dominant, and tend to be longer in terms of time. In this study, a physiographic unit is defined as follows. (1) A unit that is distinguishable from other adjacent areas by its geomorphological borders ; (2) And, a unit that is distinguishable from other adjacent areas when referring to the movement systems of seawater and materials.<BR>The notion of spatial structures of coral reefs of a 101-103 meter scale was substantiated by this research using the overlapping zonation approach known here as PGU on reef flats. The spatial structure makes a frame of the coral reef ecosystem. Therefore, setting a PGU is thought to be effective for application to coral reef conservation.
収録刊行物
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- 地学雑誌
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地学雑誌 116 (2), 223-242, 2007
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390282679206971264
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- NII論文ID
- 10025676345
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 8898517
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可