原名「台灣學術線上」
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1
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台灣北方陸棚之沈積形貌特徵
著者:Ho-Shing Yu(俞何興) ;Gwo-Shyh Song(宋國士)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:3.5仟赫回聲圖 ; 沈積形貌特徵 ; 陸棚 ; 台灣 ; 3.5 kHz Echograms ; Sedimentary Features ; Shelf ; Taiwan
刊名:ACTA Oceanographica Taiwanica
卷期:35卷2期(1996.6)
頁碼:105-114
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

本文將台灣北方陸棚上收集之3.5仟赫回聲圖像分類,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圖顯示出來。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由南向北。
3.5 kHz 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 characterized 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 a large asymmetrical sand waves field (5 to 30 km wide, 50 km long) in shelf northwest 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.




本卷期目次
ACTA Oceanographica Taiwanica 35卷2期 (1996.6)
Sedimentary Features of Shelf North of Taiwan Revealed by 3.5 kHz Echo Character/ Ho-Shing YuGwo-Shyh Song
Carbon and Oxygen Isotopic Compositions of Planktonic Foraminifera from Recent Sediments off Northeastern Taiwan/ Ying-Tzung ShiehChung-Ho WangMin-Pen Chen
Stock Assessment of the South Pacific Albacore by Using the Generalized Production Model, 1967-1991/ Yu-Min YehChien-Hsiung Wang
The Effect of Break in Western Boundary on the Western Boundary Current/ Wei LiQin-Yu LiuShih-Pei Cheng
Stock Assessment of South Atlantic Albacore by the Nonequilibrium Production Model/ Chi-Lu SunSu-Zan Yeh
Remote Sensing of Hong Kong Waters: Spatial and Temporal Changes of Sea Surface Temperature/ Dan-Ling TangI-Hsun Ni
A Preliminary Study on Air-Lift Artificial Upwelling System/ Nai-Kuang Liang
 
   
 
   

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