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題 名 | 臺灣地區設計雨型之特性評估=Characteristics Evaluations of Design Rainfall Hyetographs for Taiwan |
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作 者 | 張守陽; | 書刊名 | 農業工程學報 |
卷 期 | 43:3 1997.09[民86.09] |
頁 次 | 頁47-60 |
分類號 | 443.1 |
關鍵詞 | 設計雨型; 穩定性評估; 重現期距; 逕流演算; Design rainfall pattern; Consistency analyses; Return period analyses; Runoff simulation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究目的在於研析現有設計雨型與自行研究發設計雨型之特性。文中以降雨事 件法說明雨型參數設計值於實際降雨事件之位序,繼而探討雨型各延時降雨之重現期距特性 ,並比較不同雨型對逕流演算可能造成之差異,以建立客觀的評估方法。主要成果分述如下 : IDF 法雨型尖峰降雨之 " 均值偏差 " 於各地區之並不一致,顯示此法之不穩定性; 由 於 IDF 公式法雨型低估短延時降雨比例, 使累積曲線形狀與重視期距降雨曲線無法密合。 以絕對差值、差值平方和及 K-S 等三差值進行密合度評估, 於不同重現期距降雨條件下, 皆以二次多項式分佈雨型、常態分佈法雨型及無因次移動平均法雨型模擬最接近重現期距 降雨曲線。各雨型經單位歷線演算所得逕流歷線重心變化之幅度不大。於小基期之逕流演 算,雨型原有之不規則性造成逕流演算之歷線變動較為明顯,尤其平均法雨型更出現雙峰 之流量歷線,同時使其尖峰時間掌握具不確定性。當基期增加,逕流歷線會逐漸平滑而形 成鐘型狀,不但使不同設計雨型演算所得之尖峰流量差異降低,亦會使尖峰逕流時間差異減 少。不同雨型於五小時基期條件下,二次多項式法及對數常態分佈法雨型演算之尖峰流量分 別達級序平均法雨型者之 2 及 3.4 倍,因此小基期集水區之設計雨型將影響洪峰設計頗鉅 ,應慎重選擇設計雨型。 |
英文摘要 | This study aims to evaluate the characteristics of design rainfall hyetographs objectively options for hourly rainfall data of Taiwan. Various evaluation methods were developed to have a better understanding of returm period of rainfall pattern. Consequently, the influence on runoff hydrograph with different rainfally hyetographs were investigated. The primary conclusions may be stated as follows: The Accumulated-hyetographs of LNOR can be well fitted in with Frequency-rainfally curve at the higher return period. Better performances based on both Median-deviation evaluation and Frequency rainfally fitness are PAR, IDF, NOR and MAM methods in order. But the parameters for IDF method derived from various regions are with significant discrepancy. This shows the IDF method can not yield consistent results at different areas. In a word, all the rainfally hyetographs designed in this study performed well and stably with various evaluations. Through rainfall-runoff simulation with a triangular unit-hydrograph, the weighting times for all hydrographs derived from various rainfall hyetographs resembled each other. The irregularity of a hyetograph will inherently influence the corresponding hydrograph to be undulate for watersheds with a small base time. Hence, there may produce a double-peak-flow hydrograph at some regions especially by using HUFF method. While the base time is about 5 hours, the peak discharge simulated by LNOR and PAR patterns will be 3.4 and 2 times of that by PILG method respectively. As the base time increase, not only the shape of hydrograph will be smooth and bell-shaped, but also the difference of peak discharge among various design hyetograph will decrease. For watersheds with small base time, the peak discharge and the time to peak of the hydrograph are sensitive to the design hyetograph used in the simulation. Therefore, the choice of a design hyetography for a watershed with small base time should be cautious. |
本系統中英文摘要資訊取自各篇刊載內容。