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相關文獻
- Sedimentary Features of Shelf North of Taiwan Revealed by 3.5 kHz Echo Character
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- Physiographic and Geologic Frameworks of the Shelf-Slope Region off Northeastern Taiwan
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- Echo Character of The Shelf-Upper Slope Transition off Southwestern Taiwan Margin And Its Relationship To Quaternary Sedimentation
- Evaluating the Effectiveness of the Coal Ash Artificial Reefs at Wan-Li, Northern Taiwan
- 記臺灣蘭科植物相新記錄種--緣毛松蘭
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題 名 | Sedimentary Features of Shelf North of Taiwan Revealed by 3.5 kHz Echo Character=3.5仟赫回聲特性顯示的臺灣北方陸棚之沈積形貌特徵 |
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作 者 | 俞何興; 宋國士; | 書刊名 | 臺灣海洋學刊 |
卷 期 | 35:2 1996.06[民85.06] |
頁 次 | 頁105-114 |
分類號 | 351.924 |
關鍵詞 | 3.5仟赫回聲圖; 沈積形貌特徵; 陸棚; 臺灣; 3.5kHz echograms; Sedimentary features; Shelf; Taiwan; |
語 文 | 英文(English) |
中文摘要 | 本文將台灣北方陸棚上收集之33仟赫回聲圖像分類,並將各類之回聲圖像描繪在 陸棚上不同的區域而產生回聲特性圖。海床上的沈積形貌特徵可由回聲特性固顯示出來。兩 種主要回聲類型及五種次要回聲類型可以被分辨出。陸棚上不同的回聲類型分佈在兩個主要 地區:一個砂質陸棚具有濃密狀回聲特性及一個大的海底砂丘區顯示沈積波狀回聲特性。 回聲特性圖指出每一個沈積形貌特徵相對應於一個回聲類型,例如棉花海底峽谷的上游 具有崎嶇不平濃密狀的回聲特性,反應砂質谷底之下切現象,一個大的不對稱砂丘區(長約 50公里,寬約30公里)出現在台灣西北方陸棚上表示此處海流的速度足以搬運海床上砂質的 沈積物。從一般不對稱砂丘的形貌看出海流的方向可能出南向北。 |
英文摘要 | 3.5kHz echograms collected from the shelf north of Taiwan were classified and mapped to produce an echo character map which reveals the sedimentary features on the sea floor. Two major types and five subtypes of echoes were determined. Echo types are distributed generally into two major areas: A sandy. Shelf with prolonged echoes and a large submarine sand-dune field which generates sediment waves echoes. The echo character map shows that each sedimentary feature is chareacterized by a corresponding echo type. The upper reach of Men-Hua Canyon is characterized by prolonged bottom echoes with very rugged morphology, indicating down-cutting of sandy canyon bottom. The presence of Taiwan indicates that bottom currents are strong enough to move sand-size sediments on the sea floor. The general asymmetrical form of sand waves suggests that the bottom currents may flow from south to north. |
本系統中英文摘要資訊取自各篇刊載內容。