生態農業：自然解方修復極端氣候退化坡地之生態地景【水土保持學系/陳樹群特聘教授】
| 論文篇名 | 英文：Interaction between Driftwood Deposition Patterns and Debris Flow Fan Development |
| 期刊名稱 | Landslides |
| 發表年份,卷數,起迄頁數 | 2023, 20, 2291-2302 |
| 作者 | Chiu, Yen-Yu; Wu, Jia-Yen; Chen, Hung-En; Tsou, Ching-Ying; Chen, Su-Chin(陳樹群)* |
| DOI | 10.1007/s10346-023-02116-5 |
| 中文摘要 | 強降雨事件會導致山區明顯的地貌活動，包括崩塌、土石流、沉積物輸送和大量漂流木的產生。本研究探討了影響土石流過程中漂流木沉積模式的因素，以及漂流木對沉積物沉積的影響。我們進行了水槽實驗來模擬帶有漂流木的土石流扇的情況，並將實驗分為平原組和匯流組。平原組考慮了土石流支流遇到平緩地形的情況，而匯流組則考慮了支流遇到主流的情況。結果顯示，帶根的漂流木容易在支流上形成漂流木堆，而小漂流木可以移動很長的距離。在匯流組中，主流的流動導致土石流扇不對稱擴展，並驅使小漂流木順流而下。此外漂流木可能會影響土砂沉積物的形態，特別是在沒有主流影響的平原組。在平原組中，漂流木限制了堆積區的體積和面積的發展。漂流木還改變了土石流的路徑和沉積，導致不均勻扇面。我們的實驗結果與日本真實的歷史事件一致，包括在匯流處的不對稱擴展，以及漂流木的移動距離與大小之間的相關性。本研究為山區土石流中漂流木的沉積模式提供了見解，彌補了之前研究在漂木影響土石流堆積區的空白處。 |
| 英文摘要 | Intense rainfall events in mountain regions result in pronounced geomorphic activity including landslides, debris flows, sediment transport, and large woody debris. This study investigated the factors that affect wood deposition patterns during debris flows and the influence of wood on sediment deposition. We conducted flume experiments to simulate debris flow fans with driftwood and divided the experiments into plain and confluence sets. The plain set considered the condition where the debris flow tributary met a mild terrain, whereas the confluence set considered where the tributary met a mainstream. The results revealed that wood with roots was liable to form a log jam on the tributary, and small logs could travel long distances. In the confluence set, the mainstream flow caused asymmetric expansion of the debris flow fan and drove the small wood logs drifting downstream. In addition, wood logs may affect the sediment morphology, particularly in the plain set, which has no mainstream effect. In the plain set, driftwood constricted the development of fans in both volume and area. The wood also deflected the path and deposition of debris flows, causing an uneven fan surface. Our experiment results were consistent with the Japanese historical events, including the asymmetrical fans expansion in the confluence environment and the correlation between the travel distance and the size of the driftwood. This study provides valuable insights into the deposition patterns of debris flows with driftwood in mountain regions, filling the gap left by previous researches in driftwood-influenced debris flow deposition on fans. |
| 發表成果與本中心研究主題相關性 | 探討土砂與漂流木的交互作用與影響 |
