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2011 q2 oceancurrent
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2011 q2 oceancurrent
1.
潮波流監測地點與方法 潮波流測點APW1位於安平漁港外海, 點位坐標為TWD97 E120°58’34.86”, N22°07’23.34”,水深約14.0公尺。 每次量測期間至少為連續15天波浪每 小時輸出一筆統計資料包括波高、週 期與波向;海潮流每10分鐘輸出一筆 包括流速與流向。本次監測日期為100 年12月13日至12月29日止,共17天。 測點APW1
2.
潮位資料分析 水位資料經由調合分析顯示,主要分潮為M2(主太陰 半日潮)振幅為0.260m,次要分潮K1(主太陽全日潮) 振 幅 為
0.237m, 分 潮 O1 ( 主太 陰 全日潮 ) 振幅為 0.161m,分潮S2(主太陽半日潮)振幅為0.066m,以 法國潮型因子分析,F值為1.22,故此處海域潮汐屬於 半日潮與全日潮之混和潮型。
3.
海流資料分析(一) 水深10m處海流玫瑰圖 水深3m處海流玫瑰圖 本次之實測資料由右二圖顯示此地區流向大多為北 北西及南南東方向。底層之流速主要介於0-25 cm/s 者佔81.29%,介於25-50 cm/s者佔18.71%。表層之 流速主要介於0-25
cm/s者佔60.94%,介於25-50 cm/s者佔39.06% ,顯示流速之大小乃由下層向表 層遞增。 由上圖顯示本處海域於漲潮段時其流向主要為北北 西方向。而於退潮段時其流向主要為南南東方向。 漲潮段 退潮段 北北西 南南東 北北西 南南東 潮位 流向
4.
海流資料分析(二) 將實測海流資料換算為此處海域之沿岸流及向離岸流流速分量,於左上二圖 顯示,於表層之沿岸流流速主要分布於50cm/s以內,而向離岸流流速主要分 布於13cm/s以內。經由調和分析顯示,此處海域之沿岸流及向離岸流之流速 分量皆主要受分潮M2影響為主。 將所測得之海流數據累加並繪圖所得結果如由右上圖所示,由圖中顯示於監 測期間所累加之海流流速及流向若無陸地阻隔,其最終之點位將達七股外海 停止。而若考慮陸地阻隔,其海流漂移終點將至鹿耳門溪與曾文溪之間上岸。 此可作為海洋污染擴散之參考。 沿岸流分量 向離岸流分量 2011/12/13 11:20起 點 海流累積 向量趨勢
5.
T1/3 Wave Period Time(sec) 0~1
1~2 2~3 3~4 4~5 5~6 6~7 7~8 8~9 9~10 >10 % 0 20 40 60 80 T1/3 % H1/3 Wave Height Height(cm) 0~10 10~20 20~30 30~40 40~50 50~60 60~70 70~80 80~90 90~100 >100 % 0 10 20 30 40 H1/3 % 波浪資料分析 波高統計圖 週期統計圖 西北西 本季所實測之波浪資料,其示性波波高 (H1/3)大致以30cm至80cm之間為主,且 以40至60cm為最多,約佔65%。而示性波 週期(T1/3)大多集中在4-6sec之間,約佔 94%。波浪方向主要集中於西北西方向 (約佔35.16%)及西方向(約佔28.65%) 為主。監測期間於監測海域測到最大波高 為1.00 m,波向為西北西方向 (2011/12/22 17:00)。 於監測期間所蒐集台南地區風速風向顯示, 主要皆集中於北風。於東北季風期間本處 海域受陸地遮蔽,故波浪經由台灣海峽入 射至此處後其波向即轉為西北西向為主。
6.
09/06 09/09 09/12
10/03 10/08 10/11 11/02 11/05 11/10 11/12 0 1 2 3 4 5 6 7 8 Time (year/month) Hs(m) >H95% H95% H90% H75% H50% H25% 09/06 09/09 09/12 10/03 10/08 10/11 11/02 11/05 11/1011/12 0 0.5 1 1.5 Hm0 average(m) 09/06 09/09 09/12 10/03 10/08 10/11 11/02 11/05 11/1011/12 0 5 10 Tpaverage(sec) 09/06 09/09 09/12 10/03 10/08 10/11 11/02 11/05 11/1011/12 0 90 180 270 360 Wavedir (deg) Time (year/month) 本海域98年6月至101年12月間共10 次現場觀測。除98年6月受蓮花颱 風影響,波浪極值偏大外(最大波高 6.37m ,對應週期11.5sec),歷年統 計之平均示性波高約0.58m ,平均 尖峰週期為6.0sec ,主要波向為西 北方向。 同期間,蓮花颱風亦造成流速偏大 之 影 響 。 海 流 夏 季 平 均 流 速 為 0.26m/sec,冬季平均值為0.18m/sec, 說明此海域海潮流流速夏季較冬季 流速強(約大44%) ,主要海潮流流 向介於南至西南方向,次要流向為 流向北方。 98年6月至101年12月波浪統計比較圖 98年6月至101年12月海流統計比較 圖 歷年資料比較 分析 09/06 09/09 09/12 10/03 10/08 10/11 11/02 11/05 11/10 11/12 0 0.2 0.4 0.6 0.8 1 1.2 Time (year/month) CurrentVeolcity(m/s) >U95% U95% U90% U75% U50% U25% 歷年資料比較分析 蓮花颱風(LINFA) 波高 週期 波向 蓮花颱風(LINFA)
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