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博碩士論文 etd-0731108-061804 詳細資訊
Title page for etd-0731108-061804
論文名稱
Title
移動沙層與孔隙水壓力關聯特性研究
The study of the relationship between moved sediment and pore pressure
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
142
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2008-07-24
繳交日期
Date of Submission
2008-07-31
關鍵字
Keywords
孔隙水壓力、斜坡、動床試驗
pore pressure, slope, movable-bed model
統計
Statistics
本論文已被瀏覽 5699 次,被下載 1195
The thesis/dissertation has been browsed 5699 times, has been downloaded 1195 times.
中文摘要
波浪所引起的底床砂層移動,是海洋工程學門中研究議題之一。底床砂層移動為近岸底床因波浪及海流作用下使得砂層懸浮、移動,造成海岸底床地形的變遷。如何有效的推估漂沙移動量及建立漂沙移動的機制,是海岸工程設計裡重要的考量。

本研究目的希望藉由斷面動床水工模型試驗,在水槽鋪設1/30、1/45緩坡之底質顆粒,採用可視化底床系統,使用影像處理技術,計算出底床實際掏刷情況,並藉由新設計之孔隙壓力計支架,將壓力計支架埋設於碎波帶前、後,取得底床內部壓力變化資料對其進行分析。

試驗結果顯示:當砂層處於掏刷作用時,伴隨著動壓力的逐漸放大,當砂層處於堆積作用時,伴隨著動壓力的縮小。而當砂層處於掏刷作用後又堆積時,雖然覆土高度較高,但新堆積後的砂層不如初始狀態的緊密,仍然有著較大的動壓振幅放大率,在波浪的持續作用,動壓振幅才明顯縮小。且當初始動壓力振幅大於該深度理論靜土壓時,於後續的波浪與底床的持續作用下,有著較大的影響深度與砂層遷移的能力。
與Hsu and Jeng(1994)的有限厚度透水彈性底床理論比較,發現未碎波時的砂質底床內部,動壓振幅在孔隙砂質底床上的傳遞性不似理論推估,進入底床內部後,即大幅衰減,且量測值均小於理論值。遞減趨勢上,理論值以指數方式遞減,而實測動壓振幅值在上層靠近底床部分,則以趨近線性方式遞減,直到最底層壓力值才大幅度衰減。
Abstract
The moved sand caused by the wave is one of the important issue in coastal engineering. Moved sand of the coastal refers that wave and current ,cause sand suspended and moved, and it also caused the change of seabed along the coast. To estimate the change of sediment and establish the mechanism of sediment is very important in coastal engineering design.

The series of hydraulic model experiments in wave flume are used to observation the relationships between moved sand and incident water wave condition.

In this thesis, the movable-bed model of slope 1/45、1/30 ,which moved sand were estimated with surveyed from images of flume glass, and use image processing technique, we can calculate actual situation of movable-bed change. We also use the braces of sensor which was new design, set braces near surf zone, obtain the change of the pore pressure under the movable-bed and analysis the relationships between moved sand and incident water wave condition.
目次 Table of Contents
中文摘要------------------------------------------------------------------- Ⅰ
英文摘要------------------------------------------------------------------- Ⅱ
目錄----------------------------------------------------------------------- Ⅲ
圖表目錄------------------------------------------------------------------- Ⅳ
符號說明------------------------------------------------------------------- XII
第一章 緒論
1-1 前言------------------------------------------------------------------- 1-1
1-2 文獻回顧--------------------------------------------------------------- 1-2  
1-3 研究目的與方法--------------------------------------------------------- 1-3 
1-4 預期之觀測現象--------------------------------------------------------- 1-4
1-5 本文架構--------------------------------------------------------------- 1-5
第二章 水工模型試驗
2-1 試驗儀器與設備--------------------------------------------------------- 2-1
2-2 試驗設置與佈置--------------------------------------------------------- 2-6
2-3 試驗步驟與條件--------------------------------------------------------- 2-11
第三章 資料分析與方法
3-1 實測波高及週期處理----------------------------------------------------- 3-1
3-2 底床內壓力處理--------------------------------------------------------- 3-1
3-3 玻璃斷面取得掏刷厚度--------------------------------------------------- 3-4
3-4 數位影像處理步驟------------------------------------------------------- 3-5
第四章 試驗結果與討論
4-1 坡度1/45 壓力資料與Hsu and Jeng(1994)理論比較 ---------------------- 4-1
4-2 壓力振幅變化率與砂層掏刷討論------------------------------------------- 4-7
4-3 壓力振幅變化歷程與理論靜壓力討論--------------------------------------- 4-43
4-4 壓力梯度變化歷程討論--------------------------------------------------- 4-83
4-5 初始底床動壓與總掏刷量討論--------------------------------------------- 4-87
第五章 結論與建議
5-1 試驗結論--------------------------------------------------------- 5-1
5-2 建議與改進------------------------------------------------------- 5-3
參考文獻
參考文獻 References
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