博碩士論文 946201016 詳細資訊




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姓名 馮雅茜(Ya-Chien Feng)  查詢紙本館藏   畢業系所 大氣物理研究所
論文名稱 台灣北部初秋豪雨個案之降雨特性研究
(The precipitation characteristics of autumn torrential rainfall event in northern Taiwan.)
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摘要(中) 本文主要探討2006年9月10日北台灣初秋豪雨個案之降雨特性,當日最大累積雨量為竹子湖測站的556 mm/day(已達超大豪雨),降雨主要集中在06-12 UTC。研究中利用中央大學雙偏極化雷達和五分山雷達進行中尺度分析,討論降雨之時空分布特徵、可能機制與微物理特性。
綜觀天氣主要受到大陸性高壓與台灣南方外海之低壓產生的共伴環流所影響,大陸性高壓出海與高層轉為西風,屬於初秋的氣候特性。
中尺度水平方向的雷達回波具有多種樣貌,系統自東向西移動,並由南北走向聚集後轉為東西走向。統計結果顯示強回波主要集中於三區:台灣東北部外海、大屯山區以及淡水河口附近,此三區皆存在有利的環境因子,分別為:綜觀環境高、低壓的風場輻合,地形上坡增強,穿過台北盆地之東風與環境東北風的輻合。
雙偏極化雷達顯示降水系統主要由層狀和發展不深的對流組成,而這些淺對流被嵌於層狀系統之間,利用雙偏極化雷達反演雨滴粒徑再配合風場資訊整理出一個雲物理的概念模式,長時間存在的層狀區持續提供融解後的水滴給低層,地形迎風坡或對流區有較大的上升速度,利於凝結使得小雨滴個數增多,可能有類似種雲餵雲的加強機制,且大ZDR集中在低層,降水可能以碰撞結合為主。
摘要(英) Precipitation characteristics of the torrential rainfall event on 10th Sep. 2006 in northern Taiwan will be discussed in this thesis. The maximum daily accumulated rainfall was 556 mm at Zhuzihu. The heavist rainfall took place during 06-12UTC. The data collected by NCU dual-polarimetric radar and RCWF radar are mainly used to analyze mesoscale features, such as space-time distribution of precipitation, possible mechanisms, as well as microphysics characteristics.
In synoptic scale, a continental high in China and a low locating on Bashi Channel influenced Taiwan. They caused a low level convergent zone in the north-eastern area of Taiwan. Because the continental high moved out of China and it turned to westerly on high level, the climate character was categorized to early autumn.
The horizontal reflectivity patterns were diverse. Convections moved from east to west. Statistic result shows that the strong reflectivity dispersed to three areas, northeastern sea of Taiwan, Mt. Datun and Tamsui River estuary. The environment provided favorable conditions for these precipitation systems, such as convergence and terrain upslope enhancement.
From dual-polarization data, shallow convections were embedded in large and long-lasting stratiform system. ZDR was increasing as height decreasing. Within near saturated environment, the bigger drops in lower level indicated that precipitation may be enhanced by collision and coalescence. Using dual-polarization radar data to retrieve raindrop size distribution, and combing kinematics analysis, we could prescribe a simple microphysics conceptual model. The long-lasting stratiform system continuously provided droplets to low level convections in a wide spread region. Wherever there is more upward motion, more vapor would condense. A wider spread of DSD set up the stage of seeder-feeder mechanism.
關鍵字(中) ★ 豪雨
★ 雙偏極化雷達
關鍵字(英) ★ dual-polarimetric radar
★ torrential rain
論文目次 中文摘要 ……………………………………………… I
英文摘要 ……………………………………………… II
目錄 ……………………………………………… III
圖表說明 ……………………………………………… V
第一章 緒論
1-1 研究動機……………………………………………… 1
1-2 文獻回顧……………………………………………… 1
1-3 研究目的……………………………………………… 4
第二章 資料來源與分析方法
2-1 資料來源……………………………………………… 5
2-1-1五分山都卜勒雷達 …………………………… 5
2-1-2 中央大學雙偏極化雷達……………………… 5
2-2 雷達資料分析方法…………………………………… 7
2-2-1 風場合成……………………………………… 7
2-2-2雙偏極化雷達資料處理流程 ………………… 8
2-2-3 水象粒子分類方法…………………………… 9
2-2-4 反演雨滴粒徑分布……………………………10
第三章 個案簡介
3-1 雨量時空分布…………………………………………13
3-2 綜觀環境特徵…………………………………………14
3-2-1 地面及高空天氣圖分析………………………14
3-2-2 探空資料分析…………………………………16
第四章 中尺度降水特徵
4-1 回波系統隨綜觀天氣之變化…………………………18
4-2 中尺度水平結構特徵…………………………………19
4-3 強回波的統計分析……………………………………20
4-3-1 Hovemöller diagram ………………………20
4-3-2 強回波的時空分布……………………………21
4-3-3 ZDR的時空配置 …………………………… 23
4-4 強回波空間分布的可能原因 ……………………… 23
4-5 回波之型態特徵………………………………………25
第五章 雲物理特性討論
5-1 中尺度垂直結構特性…………………………………27
5-2 層狀區─融解層特性…………………………………28
5-3 發展不深的淺對流……………………………………29
5-4 CFAD分析………………………………………………30
5-5 層狀區和淺對流的交互作用…………………………31
第六章 結論與未來展望
6-1 結論……………………………………………………34
6-2 未來展望………………………………………………35
參考文獻 …………………………………………………… 36
附表 …………………………………………………… 42
附圖 …………………………………………………… 46
附錄 …………………………………………………… 88
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指導教授 廖宇慶、陳台琦
(Yu-Chieng Liou、Tai-Chi Wang Chen)
審核日期 2007-7-23
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