土石流導致底床變動邊界之研究

Study of Bed Sediment Movement Induced by Debris Flow

陳鈞彥(Chun-Yen Chen)

指導教授 ： 劉格非

國立臺灣大學/工學院/土木工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.02277

摘要

本研究在室內渠道內，上游於傾倒式檔板後方堆置一三角形土壩(壩長105cm、
高30cm)，下方設有一方形動床坑(長185cm，深12cm)，探討於坡度15 度，流量
1693ml/s 下，底床顆粒與上游土石壩材料粒徑皆相同情況下，模擬由土壩形成之
土石流流經動床時，其影響動床中砂石顆粒的現象。分析過程中以影像處理方式
加上人工判斷進行顆粒定位，繪出砂石顆粒流場速度分佈，並根據流場之流速分
佈描繪出受土石流影響之變動邊界隨時間的變化。
由實驗結果可知，土石流初期在土石流前方尚未到達的位置，底床亦會受到
土石流影響。以最大值誤差過濾流場所繪製底床變動邊界，因有較多流速值較小
被忽略，其邊界包含的範圍小於由平均值誤差、方均根誤差過濾後流場繪製之底
床變動邊界。

關鍵字

土石流 ； 室內實驗 ； 底床變動邊界

並列摘要

In this study, we observe the grain articles in movable bed influence induced by
debris flow through laboratory experiment. The materials in debris flow are the same
with in movable bed. In the analysis, we get the successive particle image by a video
camera. Through image processing, we get the enhanced images, and then we locate
these particles positions by artificial method. After got the flow field velocity, we
ignored the velocities which were less than value of the other error type. With the
different error type, we plot the boundary between the moving particles and static
particles in different time.
The results showed that even the area near the debris flow snout were not covered
by debris flow, some particles still moved with the neighborhood particles. And the
range from the flow field which is processed with maximum-error is less than the other
error type.

並列關鍵字

debris flow ； laboratory experiment ； sediment movement

參考文獻

9. 莊巧巧(2011)，高含砂水流流動室內試驗及類神經網路於流變參數推估之應用，

10. 謝孟荃、黃宏斌(2007)，混合粒徑輸砂量估算之研究，中華水土保持學報，38(4):

11. 游繁結、翁緯明、許淑玲、童國勛(2007)，定量流超載與減載輸砂試驗，中華

7. Richard M. Iverson, Mark E. Reid, Richard G. LaHusen(1997),” DEBRIS-FLOW

Hanson, G. J.(1990), "Surface erodibility of earthen channels at high stresses. Part