碎波帶漂沙與波動特性研究

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姓名

林柏青(Poching Lin) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

碎波帶漂沙與波動特性研究
(Study of sediment transport and infragravity waves in the surf zone)

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摘要(中)

本研究分別在台灣西海岸中部與南部地區，以波浪儀、流速計及濁度計等多種儀器觀測碎波帶附近之波浪、流及底床上之懸浮質濃度分佈，並安裝水下攝影機同步觀察底床附近之懸浮質與薄層流輸沙，以深入分析並探討碎波帶的漂沙活動。
碎波帶附近波浪因淺化碎波，能量劇烈交換引致漂沙現象。而外海入射波浪常具有群波結構，此等隱含長週期波能振盪的群波，也會直接影響底床輸沙；另外因地形或氣候因素在近岸水域常發生長週期之水面波動，此等長週期之水位振盪現象因含有相當份量之能量對於碎波帶之漂沙活動自有其重要性。本研究分析方法除了以平滑化瞬時波能法(SIWEH)解析群波現象外，另以Hilbert 轉換及內含模組函數(Intrinsic Mode Function)解析能譜分佈在時間歷程之變化，可以更清楚瞭解碎波帶附近波能變化與漂沙活動之關係。
資料分析結果顯示近岸底床附近之懸浮質濃度具有一固定背景值，其變化則有週期性之驟增現象，並與入射波浪之群波特性有密切關係。底床附近之懸浮質濃度驟增量可達背景濃度值的2~3倍，影響近岸懸浮質輸沙量估算結果甚鉅。此外，波浪由碎波帶外向岸接近時其群波特性會因波浪碎波而逐漸減弱。在碎波帶外波浪群波特性較強時，由群波主控底床之懸浮質濃度變化，但在碎波帶內此種現象則較不明顯。
為能進一步探討波浪在碎波帶之輸沙行為，本研究結合現場波浪、三維流速、濃度剖面觀測與同步影像分析，俾能在定性與定量上探討底床漂沙活動時作清楚明確的闡述。本研究並由同步現場攝影發現碎波帶內之主要漂沙機制來自沙漣結構上的薄層流及懸浮質輸沙；在粒徑0.27mm水深約1.7m波高0.34m沙漣高5.5cm底流超過40cm/s時即可引發薄層流。由於懸浮載、薄層流以及底移載在碎波帶內常是三者並存，其實際分佈與量化分析仍有待進一步觀測與探討。

摘要(英)

Field experiments were conducted to investigate the wave, current and sediment suspension across the surf zone by deploying wave gauges, 3D-ACM current meters and OBS turbidity meters at Taichung and Ampin, in the west coast of Taiwan. A synchronized video camera was also installed underwater to observe sheet flows and sediment movement on ripple beds.
Generation of sand drift in surf zone is mainly due to energy released from shoaling waves. Wave groups in approaching waves and surf beats usually imply energy undulation of low frequencies, which may affect the movement of bed sediments. A new approach using Hilbert transform and Intrinsic Mode Functions analysis to explore the effect of energy grouping and undulating on sediment suspension is presented.
An interesting bursting phenomenon of near-bed sediment concentration was found dominating in surf zone, which was closely related to incident wave groups. Peak concentrations of suspended sediment associated with wave groups were 2~3 times larger than that without wave groups.
It is found the main mechanisms of sand drift in the surf zone are sheet flows and sediment suspension. The criterion for inception of sheet flow at depth of 1.7m, ripple height of 5.5cm and sand of 0.27mm in diameter, is about 40cm/s in current speed. The suspension load, bed load and sheet flows are found all responsible for the sand drifts in surf zone. This study is far from being complete but should provide readers a good insight on sediment transports in surf zone. It needs further observations to clarify the amount of sand actually moved by sheet flow alone.

關鍵字(中)

★ 碎波帶
★ 群波
★ 長波振盪
★ Hilbert轉換
★ 薄層流
★ 漂沙

關鍵字(英)

★ Hilbert transform
★ infragravity waves
★ wave groups
★ surf zone
★ sheet flow
★ sand drift

論文目次

目錄
中文摘要………………………………………………… I
英文摘要………………………………………………… III
誌謝……………………………………………………… IV
目錄……………………………………………………… V
圖目錄…………………………………………………… IX
符號說明………………………………………………… XX
第一章緒論…………………………………………… 1
1.1研究動機……………………………………………… 1
1.2 文獻回顧……………………………………………… 2
1.2.1 碎波帶之現場觀測………………………………… 2
1.2.2 碎波帶之長週期振盪……………………………… 4
1.2.3 沙漣活動之觀測實驗……………………………… 4
1.2.4 底床漂沙活動之攝影觀測………………………… 5
1.3 研究方法及說明……………………………………… 7
1.4 研究目的與本文組織………………………………… 11
第二章理論說明……………………………………… 15
2.1 波動理論……………………………………………… 15
2.2 底床邊界層水粒子運動模式………………………… 18
2.3底床上懸浮質之垂直分佈與輸沙量推算…………… 19
2.4沙漣與薄層流輸沙…………………………………… 21
2.5 平滑化瞬時波能(SIWEH)…………………………… 24
2.6 Hilbert轉換之能譜分析方法………………………… 25
2.6.1 瞬頻(Instantaneous Frequency)………………… 25
2.6.2 內含模組函數(Intrinsic Mode Function)……… 26
2.6.3 經驗模式分解法(Empirical Mode Decomposition method) ……………………… 27
2.6.4 Hilbert能譜分析…………………………………… 46
第三章緩坡碎波帶之現場觀測分析…………………… 49
3.1 現場背景資料說明…………………………………… 49
3.1.1 地形特性…………………………………………… 49
3.1.2 海氣象特性………………………………………… 51
3.1.3 底質粒徑分析……………………………………… 52
3.2 實驗佈置及方法……………………………………… 54
3.3 結果分析……………………………………………… 57
3.3.1 碎波帶內外之波浪特性…………………………… 57
3.3.2 碎波帶之沿岸流分佈……………………………… 61
3.3.3 流運動之長週期波動現象………………………… 62
3.3.4 懸浮質觸發(bursting)現象與群波能量之關係… 62
3.3.5 碎波帶長週期波之波能振盪現象………………… 66
第四章陡坡碎波帶之現場觀測分析………………… 70
4.1 現場背景資料說明…………………………………… 70
4.1.1 地形特性…………………………………………… 72
4.1.2 海氣象特性………………………………………… 73
4.1.3 底質粒徑分析……………………………………… 74
4.2 實驗佈置及方法……………………………………… 81
4.3 結果分析……………………………………………… 85
4.3.1 碎波帶波浪與流況分析…………………………… 86
4.3.2 碎波帶捲波與回流………………………………… 100
4.3.3 懸浮質濃度與群波能量之關係…………………… 104
4.3.4 由底層流看水粒子運動…………………………… 104
4.3.5 碎波帶長波振盪現象……………………………… 113
第五章底床漂沙活動之攝影觀測…………………… 136
5.1 碎波帶附近底床之沙漣觀測………………………… 136
5.1.1 離岸40m處之沙漣活動…………………………… 137
5.1.2 離岸20m處之沙漣活動…………………………… 143
5.1.3 離岸70m處之沙漣活動…………………………… 149
5.1.4 離岸10m處之沙漣活動…………………………… 153
5.2 漂沙活動與群波……………………………………… 158
5.3薄層流移動層厚度與底流強度關係………………… 168
5.4沙漣薄層流發生之臨界條件………………………… 169
第六章結論與建議…………………………………… 171
參考文獻………………………………………………… 177
簡歷……………………………………………………… 181
附錄一：EMD解析程式…………………………………… 182
附錄二：IMF解析程式…………………………………… 198
附錄三：時-頻-能譜解析與繪圖程式………………… 199
附錄四：邊際能譜解析與繪圖程式…………………… 203

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指導教授

周憲德(Hsien-Ter Chou)

審核日期

2003-12-18

推文