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研究生:劉重復
研究生(外文):Chong-Fu, Leu
論文名稱:淡水河水舌之模式研究
論文名稱(外文):The Damshuei River Plume:A model study
指導教授:羅耀財
指導教授(外文):Yao-Tsai, Lo
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:海洋環境資訊學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:68
中文關鍵詞:淡水河潮汐水舌數值模式
外文關鍵詞:Danshuei RiverTideRiver PlumeNumerical Model
相關次數:
  • 被引用被引用:0
  • 點閱點閱:263
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  • 下載下載:27
  • 收藏至我的研究室書目清單書目收藏:1
淡水河位置處於台灣北部,是台灣北部第一大河,台北大都會區的廢污水經由淡水河,匯流入河口海域,污染河口環境與生態,加上台北港的興建,河口水舌與潮汐相互作用,更形複雜。
本論文是以淡水河口及其附近海域為範圍,利用三維非性水理模式Princeton Ocean Model (簡稱POM),研討區域內的溫鹽環流及潮流與水舌的互動情況,及台北港對河口水舌與潮汐的影響。其開口邊界值,以台灣東北角麟山鼻潮位站的實測半日潮水位,為給定軀動模式的水位。本模式只考慮潮流與河流淡水的注入,其他重要的因素如風等則忽略,來研究水舌與潮流的運動狀況。
模式結果顯示,在河口形成一股隆起的水團,以及因地轉效應形成順時鐘方向的大渦漩,與河口右岸類似凱爾文波的沿岸流。此外,我們發現主河道從出海口的右側流入流出,此處海流較為湍急。從表層流、底層流及河口鹽度垂直橫斷面圖研讀,可看出台北港建港後的堤岸效應,對於淡水河水舌的影響,在平潮時期轉為漲潮時最為明顯。而河道出口左側即台北港防波堤北,成為流t小有小渦漩的低能量區域,此出口海域淤淺情況已由最近的空照圖片顯現出來。台北港的南面及堤內也形成高鹽度流小的低能量區域並有渦漩存在,久後也是有淤淺的可能。
又因台北港的堤岸效應,阻礙漲落潮的往返及淡水河泥沙來源,台北港西南方海岸、海灘也會因而變遷,此乃本模式將繼續進行的目標,並有待現場實測與時間的印證。
Since a vast amount of family sewages and industrial wastes from Taipei metropolis brought onto the vicinity of the Danshuei River mouth, it may significantly affect the estuarine environment and ecosystem. Furthermore, the interaction between the river plume and tidal current seems to be more complicated due to the construction of Taipei Harbor.
In this study, we use a three-dimensional, non-linear primitive-equation ocean model, Princeton Ocean Model (POM) to research the formation and evolution of the Danshuei River plume and its modulation by tides. the model was forced by a semi-diurnal tide (M2) of Lin-san-pi tide station located at the north-east coast of Taiwan, For simplicity, the model just considers tides and river inflow.
The model result shows that surface flow turns anticyclonically within the river mouth due to the Coriolis force. Also, a baroclinic boundary current is developed along the coast toward northeast. We find that the main channel of the Danshuei River is close to the right of the river viewing from land to sea, where the flow is swift. The impact of the jetty effect of Taipei Harbor on the Danshuei River plume is not so obvious except during the period of the stand tide. In addition, the flow is slow and perhaps forms a small-size eddy in the region between the left side of the river mouth and the north jetty of Taipei Harbor. From recent satellite images, we can find that it is the region of shoaling water.
According to the model result, we recognize that the influence of the jetty of Taipei Harbor on the tidal flow and the Danshuei River plume is significant. We plan to do further study of the distribution of the sediment near this region.
誌謝 Ⅰ
摘要 Ⅱ
ABSTRACT Ⅲ
目錄 Ⅴ
表目錄 Ⅶ
圖目錄 Ⅷ
第一章�緒論 1
1-1、水舌定義 1
1-2、淡水河口環境 2
1-3、過去的相關研究史料 4
1-4、研究動機 7
第二章� 研究方法 10
2-1、模式 10
2-2、基本理論 11
2-3、2.5階紊流閉合模式 13
2-4、σ座標系統 14
2-5、垂直方向邊界條件 17
2-6、MPDATA模式 17
2-7、計算時距的限制 20

第三章 模式的建制 23
3-1、網格設定 23
3-2、資料來源與初始條件 27
第四章�結果與討論 31
4-1、 潮汐模式 31
4-2、淡水河淡水注入河口流場、鹽度場 39
4-2-1、表面流及鹽度場 39
4-2-2、底層流及鹽度場 45
4-2-3、河口垂直橫斷剖面鹽度圖 50
4-2-4、台北港對淡水河口水舌及流場、鹽度場的影響 57
第五章�結論 63
5-1、結論 63
5-2、展望 65
參考文獻 66
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