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タイトル: | 人為的撹乱による湖底微地形および底泥堆積構造の変化 |
その他のタイトル: | Disturbance of Micro-topography and Bottom Sediment Structure of the South Basin of Lake Biwa Affected by Human Works |
著者: | 志岐, 常正 奥田, 節夫 横山, 康二 太井子, 宏和 井内, 美郎 |
著者名の別形: | SHIKI, Tsunemasa OKUDA, Setsuo YOKOYAMA, Koji TAISHI. Hirokazu INOUCHI, Yoshiro |
発行日: | 1987 |
出版者: | 滋賀県琵琶湖研究所 (現: 滋賀県琵琶湖環境科学研究センター) |
誌名: | 滋賀県琵琶湖研究所研究報告 |
巻: | 86 |
号: | A04 |
開始ページ: | 83 |
終了ページ: | 89 |
抄録: | An experimental study was performed to test the disturbance of sediments by scratching for shellfish-gathering and run of boats at full speed. It has been noted by Geological Survey of Japan that paired and single lines appear on sonic side-scan records of the almost whole areas of the South Basin of Lake Bi wa. As a result of this experimental study the lines were assigned as tracks of scratching for shellfish-gathering. Bottom surface of the experimental area was observed by diving also before and after the experimental scratchings and runs. Comparative studies were made on X-ray CT scanning pictures and ordinary radiographic pictures of the cores obtained from the scratched places and the non-affected distant places in the experimental area. Depth of the scratched sediments was several centimeters from the surface. Full-speed runs of the fishing-boat did not affect the microtopography and structure of the bottom surface. |
著作権等: | 発行元の許可を得て登録しています. |
URI: | http://hdl.handle.net/2433/264241 |
出現コレクション: | 志岐 常正 |
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