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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41195
標題: | 合理化公式應用於台灣集水區適應性之研究-以翡翠水庫集水區為例 Application of the rational formula used for watershed in Taiwan-a case study of Feitusi Reservoir Watershed |
作者: | Chia-Jung Hsieh 謝嘉蓉 |
指導教授: | 陳信雄(Hsin-Hsiung Chen) |
關鍵字: | 合理化公式,頻率分析,降雨強度,物部式,洪峰逕流係數,集流時間, Rational formula,Frequency analysis,Rainfall intensity,Monobe formula,Runoff coefficient,Concentration time, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 合理化公式Q=CIA為設計集水區系統時推估最大洪峰流量之常用方法,由於此法屬經驗公式且考量參數簡單,故常有無法因應各地實際洪峰流量之情形發生。
本研究以翡翠水庫集水區內六個雨量站,自西元1988~2006年連續19年之雨量資料,以對數皮爾森三型分佈法分析不同回歸年之最大日雨量。再利用以實測時雨量資料修正物部式K值,推求出最大時雨量作為合理化公式之降雨強度(I);另以GIS相關軟體對集水區做空間分析得各子集水區面積(A)及集水區特性因子;最後再由多場單一降雨事件與最大洪峰流量相對應關係,即可決定出翡翠水庫集水區之洪峰逕流係數(C)。研究成果如下: 1.翡翠水庫各雨量站經修正之物部式K值範圍在0.556~0.593之間。 2.翡翠水庫4個子集水區內逕流係數皆與洪峰歷線上升前之累積雨量 呈高度相關。代表土壤臨前濕潤條件對逕流係數影響甚大。 3.翡翠水庫內4個子集水區之集流時間為2~4小時。 The rational formula, Q=CIA, is possibly the simplest flood estimation technique available using rainfall-runoff relationships. The many criticisms regards it’s too over- simplification, and sometimes it could not fit the different watershed. The annual maximum daily rainfall data of the six rainfall stations in the Feitsui Reservoir Watershed between 1988~2006 inclusive (19years) were made using the log Pearson Type III distribution method. We analyzed the rainfall intensity (I), based on the data for hourly rainfall from 1988~ 2006, and modified the parameter-K in Monobe formula; Then used the GIS software to do the spatial analysis for the four sub-basins. Analyzed the many single rainfall events to find the correlation with the peak flood flow, and decided the runoff coefficient (C) in the Feitsui Reservoir Watershed. 1.The Monobe formula’s parameter K is 0.556~0.593 in the Feitsui Reservoir Watershed. 2.The runoff coefficient in four sub-basins of Feitsui Reservoir Watershed is highly related with the accumulate rainfall before the hydrograph start to rise. 3.The concentration time in the four sub-basins of Feitsui Reservoir Watershed is 2~4 hours. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41195 |
全文授權: | 有償授權 |
顯示於系所單位: | 森林環境暨資源學系 |
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