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標題: 烏溪流域三角形單位歷線之研究
Study on the Triangular Unit Hydrograph for Wu River Catchment
作者: 林昭儀
Lin, Chao-Yi
關鍵字: 三角形單位歷線;triangular unit hydrograph;線性水庫模式;瞬時單位歷線;動差法;linear reservoir model;instantaneous unit hydrograph;generalized method of moment
出版社: 水土保持學系所
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本研究選用1994-2008年間降雨強度為中度(中度颱風的定義為其颱風之中心附近最大風速每秒32.7至50.9公尺,相當12~15級風)以上之颱風十場,經由檢定驗證得烏溪流域各子集水區平均無因次單位歷線,再推求各場颱洪事件之m值( )予以平均,得其適合各子集水區之m值,大里溪之m值為4.024,南港溪之m值為3.13,北港溪之m值為3.603,貓羅溪之m值為3.39。

In the hydrologic design project, the estimation of hydrograph generally needs the complicated topographic and the hydrologic data, but they are often lost due to ages and human factors. The triangular unit hydrograph composes of few parameters and are easily estimated, and then it was used very often. From the hydrograph, the peak discharge and peak time can be obtained. General methods of rainfall-runoff routing in Taiwan are the dimensionless unit hydrograph and the linear reservoir model. By using 1st moment and 2ndmoment of effective rainfall and direct runoff hydrograph, the values of n and K can be calculated, and the physical meaning of nK is lag time. This study uses trial and error method to adjust the values of n and K to fit with the actual runoff hydrograph. Ten middle typhoon events (middle typhoon definition: nearby the center of typhoon its maximum wind speed is 32.7 -50.9 m/s, equivalent to wind level 12~15) during 1994-2008 are adopted to verify the simulation by various methods and then the average dimensionless unit hydrographs are obtained. The average m values are found to fit each watershed in Wu River. The m value is 4.024 for Dali River, 3.13 for Nangang River, 3.603 for Beigang River, 3.39 for Maoluo River.
其他識別: U0005-2008200918012700
Appears in Collections:水土保持學系

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