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題 名 | 土石流扇狀地之三維堆積地形=The 3-D Deposition Evolution of Debris-Flow Fans |
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作 者 | 謝正倫; 蔡元芳; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 10:4 1998.12[民87.12] |
頁 次 | 頁719-730 |
分類號 | 434.273 |
關鍵詞 | 土石流; 土石流扇狀地; 現場調查; 實驗研究; Debris flow; Debris-flow fans; Field investigations; Experimental study; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用一系列以各種不同實驗條件下所形成之72個土石流扇狀地及5處現場 土石流扇狀地來探討土石流扇狀地之堆積特性。由實驗及現場調查結果發現,土石流扇狀地 之無因次橫、縱斷面在平衡階段皆具有高斯分佈之幾何相似特性,且其橫、縱斷面分佈係數 會隨著土石流中混合礫石均勻係數之變大及泥漿流體密度之增加而起加大之作用,至於無因 次之平面形態則均具有圓弧分佈之幾何相似特性。且利用上述所得之三個無因次幾何相似形 態函數可推導土石流扇狀地之三維堆積地形公式 z=f(X, Y, Lc, Bm, Zo) 及體積公式 V= α LcBmZo。 文中更進一步利用 Takahashi 之研究推估土石流扇狀地之最大淤積長度 (Lc) ;且藉由實驗資料所迴歸出之土石流扇狀地沿中心軸之平均淤積坡度公式可用以概估土石流 扇狀地之扇頂淤積厚度 (Zo); 而在土石流土砂流出量為已知或可估計之情況下,亦可利用 前述之扇狀地體積公式計算土石流扇狀地之最大淤積寬度 (Bm )。如此在 Lc、Bm 及 Zo 為 已知之情況下,則整個土石流扇狀地之三堆積地形即可確定。 |
英文摘要 | Seventy two debris-flow fans of different experimental conditions and five debris-flow fans in the field were used to study the configurations of the debris-flow fan in this paper. The experimental results and field investigations showed that the non-dimensional longitudinal and cross sectional profiles of the debris-flow fan in the stable stage can be described by Gaussian functions, and the distributive coefficients of the longitudinal and cross sectional profiles will increase with the increase of the uniformity coefficients of the non-uniform particles and the density of the viscous fluid, while the non-dimensional plan form of the debris-flow fan can be described by a circular arc. By combining the three non-dimensional curves mentioned above, the volume function, V= α LcBmZo, and the 3-D morphological function, Z=f(X,Y,Lc,Bm,Zo),of the debris-flow fan can be easily derived. The maximum length, Lc, of the debris-flow fan can be predicted using Takahashi's technique, and the thickness of the apex point Zo, Zo, of the debris-flow fan by using the experimental function of the average deposition slope along the center line. Under the predictable value of debris-flow effluxes, the maximum width, Bm,of the debris-flow fan can be calculated by the volume function. Then the 3-D deposition evolution of the debris-flow fan can be determined given the parameters Lc,Bm and Zo. |
本系統中英文摘要資訊取自各篇刊載內容。