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題名:淡水河口區水下地形    
Underwater Topography in the Area of Tamsui Estuary
著者:宋國士(Gwo-Shyh Song) ;溫良碩(Liang-Saw Wen) ;劉康克(Kon-Kee Liu) ;劉佩琨(Pai-Kuan Liu)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:淡水河 ; 水下地形 ; 淡水河口 ; Tamsui Estuary ; Tamsui River ; Underwater Topography
刊名:台灣海洋學刊
卷期:39卷2期(2001.12)
頁碼:135-159
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

位於社子島以西之淡水河口區段,完成的水下地形圖可清楚指出地形特徵在南北兩段有明顯不同。兩段的分界點位於竹圍北側的紅樹林保護區中段河域東岸;南段為窄而深的谷型地貌,但在關渡橋有一地形鞍部其使河川在此處看來存有深13至15米之兩組凹洞。在分界處,水道變寬使水流變緩,河道在此易淤積變淺。進入北段河道後河道開始彎曲,曲流外緣因此會產生快水流的沖刷,沿著河岸內側形成平均8米深的河床渠道。80年前河道中曾存在面積遼闊的沙洲或淺灘,北段河道(除出海口外)因此表現出河道的分叉地貌,隱喻當時河水向下游流動的能量和潮量能量相當。自從水庫興建以來,使上游流下的水及砂減小,結果在旱水期,漲潮流將淘選出的古泥沙上溯搬離;在洪水期時,經由河流及退潮流一併帶至出海口沈積在台北港北防波堤北側,淺於7米水深的平坦海床上。水中沙洲,淺灘及分叉水道也一一式微。
In the final bathymetrical map, it gives different bottom looks in the southern and northern segment, respectively, of the Tamsui Estuary. The transit of two segments is at the midst of riverbank by the Honshulin Reserved Territory located north of the Chuwei town. In the southern segment, riverbank shapes like a canyon with bottom depths around 13-15 meters; along the course line, it exists a convex high like a saddle in the region close to the Quandao Bridge. In the transit region, the river becomes wider, the flow thus slows down, siltation occurs such that riverbed tends to be shallower in depths. In the northern segment, river begins to bend such that the talweg, averaged at 8 meters deep, is found inside the outer bank of river. Since 80 years ago, the Tamsui River has been bifurcated (except in its river mouth) with a series of shoals lying on the middle of river or the inner side of riverbank, implying the hydrodynamic has been dominated by the fluvial flow and the tidal flow at least in last decades. By the construction of water dams in the up streams, fluvial flow can only carried small amount of sediments in recent years. Paleo-sediments have been sorted and carried upstream by the flood tidal flow in the dry season, then removed and directed into the ocean occasionally in the flood events. They have been deposited on the seabed shallower than 7 meters deep in the shoal area north to the North Harbor Bank of the Taipei Harbor. Eventually, the shoal, the crescent shoal, and the bifurcated channel have been gradually faded on the riverbed.


    

本卷期目次
台灣海洋學刊 39卷2期 (2001.12)
大漢溪流域水體環境中重金屬及營養鹽分布的探討/ 孫毓璋彭竟凱
由底棲群聚看淡水河河口生態品質/ 謝蕙蓮
淡水河口區水下地形/ 宋國士溫良碩劉康克劉佩琨
淡水河流域及河口生態與環境研討會--報告及建議/ 李遠輝劉康克邵廣昭
基隆河水污染防治-設計與工程問題探討/ 駱尚廉
台北關渡溼地昆蟲多樣性之研究/ 馬堪津趙秉儀
生命觀的河川整治:生物指標的應用與推廣/ 陳章波
三十年來沿岸海域環境品質研究之回顧/ 洪楚璋
淡水河在颱風期間懸浮顆粒物質之碳氮含量、同位素組成及輸出通量/ 陳冠倫高樹基劉康克
淡水河流域防洪計畫/ 黃金山
Dissolved aluminum in the Tanshui estuary and inshore seawater/ Tien-Hsi Fang
 
   
 
   

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