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博碩士論文 etd-0125106-151807 詳細資訊
Title page for etd-0125106-151807
論文名稱
Title
由氣象浮標資料探討台灣附近海域的風場特性與風應力
Investigating Wind Characteristics and Wind Stress on the Coastal Waters of Taiwan Based on the Meteorological Buoy Data
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
88
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
2006-01-05
繳交日期
Date of Submission
2006-01-25
關鍵字
Keywords
海氣溫差、持續性、遮蔽效應、湧浪、陣風係數、風應力、浮標、層化、波齡
stress, gust factor, swell, wave age, stability, air-sea temperature, persist, buoy
統計
Statistics
本論文已被瀏覽 5668 次,被下載 1742
The thesis/dissertation has been browsed 5668 times, has been downloaded 1742 times.
中文摘要
本研究主要利用氣象局與水利署的四個浮標測站(花蓮、新竹、鵝鸞鼻與金門)資料,分析海表面的風、水溫、氣溫以及波浪的觀測資料,並研究相關的係數值。資料期間包含了2001年到2003年的冬季與夏季。
因為陸地測站的風場在建築物或山丘的遮蔽效應影響下,風速不僅減弱且風向與海面上的風場上會有所偏差,所以與離島風速比較下,浮標觀測的風場具有代表性。比較兩個離島測站與四個浮標測站可以得知在台灣週遭海面上的風場大致是相同,也就是表示在冬季時海面上吹東北季風,夏季時海面吹西南季風,如此的旺盛季風型氣候也決定了台灣的風場分佈。由在不同風速範圍內的持續時間可以比較得到不同地點風場的定量結果,可以得知海面風場的持續性比起陸地風場還佳,其中又以台灣西岸風速持續性更佳。同時比較在不同的大氣層化下風速的變化中,可以得到在中性層化情形下的風場較其餘層化條件來的大,且風速機率分佈的圖中可以看出同時間內風速有離岸邊越遠越大的傾向,且在近岸1~2Km內為海陸風混合的氣象。
海氣溫差和風速是影響層化的因素,且氣溫的日變化比起同時的海溫變化更劇烈,其中冬季海氣溫差變化更為明顯,尤其在台灣東部沿岸,海溫比氣溫間的溫差可高達10度左右,再加上冬季花蓮海面的風速值並不大,就造成在花蓮海面上在冬季時較偏向於不穩定分層的情況。
海面上波浪的分類方法可以利用波齡大小分別湧浪與未成熟波兩類,其中的湧浪代表波高與週期經過長吹風域後已達到飽和不再發展的情況,故較無法反應當時海面上風場影響波浪場的情況,因此若波浪組成中湧浪占主導地位的情況下,對於預估風應力值時會有極大的誤差。而在風浪為主的波浪條件下,可以利用波浪尖銳度計算得到海表面粗糙長度。
分析在台灣海面上動量通量間的參數值可以發現,陣風係數在中性與不穩定分層的條件下,會有不同的相關函數相關。在中性時,陣風係數隨著風速而改變,但在不穩定分層的情況下,陣風係數則隨著層化值而變化。在中性分層狀況下,風速與曳力係數間呈現正比關係。對於風速垂直剖面的冪次項、風速紊流強度,以及可直接利用觀測得到的陣風係數三者間的相關性在強風以及海氣處於中性層化的條件下,可以發現三者具有一致性,且趨近於定值0.1。
Abstract
This study is about the data analysis of wind speed on sea surface, water temperature, atmospheric temperature, and sea waves observations from four buoy stations (Hua-Lian , Hsin-Chu , E-Luuan-Bi and Kin-Men) that belong to Central Weather Bureau Republic of China and Water Resources Agency, and related researches. The period of this study is in winter and summer from 2001 to 2003.
Because of the shelter effect from building or hillocks in land, the wind speed on land is abated and not consistent with that on sea. Comparing data form two island stations ( Dongjido and Lanyu) and four buoy stations, the winds around Taiwan are almost the same. That means the monsoon controls the wind direction in summers and winters. Comparing the quantitative results from different wind speed areas in same period of time, the continuity of sea wind is better than that of land wind, especially best in west Taiwan. Also comparing the changes of wind speed in different atmospheric stability layers, wind is stronger in neural than others. Wind speed distribution also showed wind speeds increased when it is far from land, and sea breeze happened near land within 1-2 kilometer.
Sea temperature and wind speed are the factors affecting stability. The diurnal variation of air temperature is greater than that of sea and diurnal variation of sea is more significant during winter. Especially along coastal in Eastern Taiwan, the temperature difference between sea and atmosphere could be greater than 10 ℃, moreover the wind speed on sea surface in Hua-Lian is slow. Therefore, it caused more unstable on sea surface in Hua-Lian.
waves could be classified into two types by wave age: swell and wind sea. Swell means because of passing long fetch, the weave height and wave period are saturated and no longer develop. It can’t reveal the effects of sea wind on waves. Therefore, if swell is the major composition of waves, the inaccuracy of calculated stress would be large. On the contrary, when wind sea is the major composition of waves, roughness could be calculated by wave steepness.
While analyzing coefficient of momentum flux on sea surface near Taiwan, gust factor under neutral and unstable conditions had different. Gust factor would change with wind speed under neutral condition, but change with stability under unstable condition. In neutral condition, wind speed and drag coefficient are direct proportion and then correlation among p of power law of wind profile, turbulence intensity and gust factor under neutral condition and strong wind are similar, the value close to 0.1.
目次 Table of Contents
目錄
誌謝 ……………………………………………………………………………………… Ⅰ
摘要 ……………………………………………………………………………………… Ⅱ
Abstract ………………………………………………………………………………… Ⅲ
目錄 ……………………………………………………………………………………… Ⅳ
表目錄 …………………………………………………………………………………… Ⅴ
圖目錄 …………………………………………………………………………………… Ⅵ
符號說明 ………………………………………………………………………………… Ⅶ
第一章 前言 …………………………………………………………………………… 1
1.1 文獻回顧 ………………………………………………………………… 1
1.2 研究目的 ………………………………………………………………… 3
1.3 本文架構 ………………………………………………………………… 4
第二章 理論計算 ……………………………………………………………………… 5
2.1 理論回顧 ………………………………………………………………… 5
2.2 大氣層化相關公式 ……………………………………………………… 6
2.3 使用公式 ………………………………………………………………… 8
第三章 資料來源與分析方法 ………………………………………………………… 11
3.1 觀測資料簡介 …………………………………………………………… 11
3.2 分析方法 ………………………………………………………………… 12
第四章 結果與分析 …………………………………………………………………… 14
4.1 台灣週遭海面風場的時空變化 ………………………………………… 14
4.2 層化對海面大氣的影響 ………………………………………………… 21
4.3 粗糙長度對海氣通量的影響 …………………………………………… 25
4.4 台灣週遭海面上海氣交互作用參數分析 ……………………………… 31
第五章 結論 …………………………………………………………………………… 35
第六章 文獻回顧 ……………………………………………………………………… 37
參考文獻 References
第六章 參考文獻
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