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研究生(外文):Yang, Yi-Shuan
論文名稱(外文):An Analysis of Probabilistic Flood Hazard in Coastal Regions of Taiwan—Taking Tainan City as an Example
指導教授(外文):Hsu, Tai-Wen
口試委員(外文):Liu, Wen-HongChiang, Wen-ShanHuang, Wei-PoHsu, Tai-Wen
外文關鍵詞:Flood HazardFlood potential mapExpected ValueProbabilisticAHP
  • 被引用被引用:1
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然而,淹水潛勢圖是針對單一降雨情境(定量降雨或重現期降雨)搭配設計雨型而製作,往往與真實事件有相當程度的差異,無法有效應用在防災預警上。因此,本研究試圖以期望值概念,採用第三代淹水潛勢圖的8種重現期降雨情境,繪製機率式淹水潛勢圖並以AHP法加值成機率式淹水危險度圖,以改善原淹水圖資之可用性。為計算研究區域上的淹水深度期望值,本研究選取三種積分公式(Trapezoidal Rule,Simpson’s 1/3-Rule及Simpson’s 3/8-Rule),其適用於非等間距離散積分,進而個別應用於淹水深度期望值計算,並比較三者間差異。最後,本研究以台南市沿海區域為研究對象,以較高精確度積分方法Simpson’s 3/8-Rule進行該地機率式淹水潛勢圖繪製並加值成機率式淹水危險圖。與三場颱風事件(梅姬颱風,康芮颱風及凡那比颱風)之淹水範圍調查結果作比較,結果顯示屬中高危險的淹水區域與實際淹水範圍有著一致性,說明本研究所提出的機率式淹水圖資,相較單一情境的淹水圖資,更具實用性。接續,加入因颱風引起的暴潮情境,製作另一張具有暴潮情境的淹水危險度期望值,使淹水危險度圖更具使用價值。
Due to climate change, Taiwan has frequently been attacked by typhoons with extremely heavy rainfalls such as Typhoon Morakot in 2009, Typhoon Meranti in 2016 and Typhoon Haitang in 2017. The floods induced by those typhoons caused serious hazards. To prevent and mitigate flood hazard, the Taiwan Water Resources Agency has produced three generations of flood potential maps to debelope flood early warning stystems. The spatial resolution of the newest third map is 40 m while the simulation conditions containing surface overland flow, river and sewer systems and various rainfall and storm surge scenarios are considered in the map.
Each flood potential map was made based on one specified 24-hour rainfall scenario suah as the returm period respectively in 2, 5, 10, 25, 50, 100, 200, 500 years. It is difficult to be applied to practical flood mitigation since the specified scenarios cannot match real rainfall events. Motivated by the drawback, we attempt to produce a probabilistic flood hazard map using an expected value theory in the study. Three integration schemes for unequal intervals regarding trapezoidal rule, Simpson's 1/3-rule and Simpson's 3/8-rule are adopted to calucalate the expected value of flood depth. The comparison among the three schemes shows the Simpson's 3/8-rule is capable of yielding smoother distribution of expected flood depth. The coastal regions of Tainan City located in southern Taiwan is chosen as the study area. The area-averaged expected flood depth of each town in Tainan is caluculated by the Simpson's 3/8-rule. Based on the area-averaged expected flood depths and flood areas of the towns, the Analytic Hierarchy Process (AHP) is introduced to evaluate the flood hazard levels of the towns to finish the probabilistic flood hazard map. Three typhoon events including Typhoon Meiji, Typhoon Kang Rui and Typhoon Vanabe are used to test the reliability of the probabilistic flood hazard map. It can be found that the medium and high hazard areas are consisitent with real flood areas. Furthermore, various storm surge conditions are considered to produce another probabilistic flood hazard map for future flood mitigation and flood early warning.
摘要 I
目次 III
表目錄 IV
圖目錄 V
第壹章 導論 1
1-1 文獻回顧 1
1-1-1 淹水危險圖 1
1-1-2 淹水模擬 4
1-1-3 數值積分 5
1-2 研究動機 6
第貳章 基本理論探討 7
2-1 危險度評估 7
2-1-1 層級分析法 7
2-1-2 危險度分析參考因子 11
2-2 淹水深度期望值 14
2-3-1 等距積分 14
2-3-2 不等距積分 17
2-3-3 期望值 20
第叁章 研究方法 21
3-1 研究區域概述 21
3-2 災害潛勢分析 22
3-2-1 空間資料分析 22
3-2-2 數據分析 24
3-2-3 比較雨型 30
3-2-4 危險度因子權重 34
3-3 研究情境 35
第肆章 結果與討論 36
4-1 淹水面積期望值 36
4-2 驗證案例分析 38
4-3 淹水危險度分析 41
4-4 暴潮分析 43
第伍章 結論與建議 49
5-1 結論 49
5-2 建議 49
參考文獻 50
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