【學術亮點】Optimizing sediment control by adjusting the relative spacing between trusses/beams in an open-type check dam
Ecological Agriculture: Nature-based Solutions for Restoring Ecological Landscapes on Degraded Hillslopes due to Extreme Climate Events【Department of Soil Water Conservation / Chen, Su-Chin / Distinguished Professor】
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：Optimizing sediment control by adjusting the relative spacing between trusses/beams in an open-type check dam 中文：通過調整開放式攔砂壩相對間距優化泥沙控制 |
| 期刊名稱 | Landslides |
| 發表年份,卷數,起迄頁數 | 2025, 22, 551-565 |
| 作者 | Chen, Hung-En; Chen, Tzu-Yu; Zheng, Ya-Lin; Chiu, Yen-Yu; Chen, Su-Chin(陳樹群)* |
| DOI | 10.1007/s10346-024-02369-8 |
| 中文摘要 | 開放式防砂壩在減緩山區土砂災害方面具有良好成效。與過去封閉式壩體有所不同，開放式壩體不會中斷土砂運移或生態連續性。本研究利用水槽實驗探討縱桿與橫桿式防砂壩對土砂攔截之成效，重點分析了縱桿與橫桿間相對間距對土砂攔截的影響。我們評估了可調式防砂壩透過調整縱桿與橫桿間距來維持土砂動態平衡的能力。利用不同礫石粒徑及調整縱桿與橫桿間距的實驗結果顯示，較小的間距能顯著減少通過壩體的土砂比例，而較大的間距則有助於土砂通過壩體。兩種壩型展現出不同的行為。橫桿在攔截土砂方面比縱桿更為有效，特別是在相對間距1.5至2.3之間時，兩種壩型的土砂攔阻率差異可達43%。以南台灣東莊溪的可調式橫桿防砂壩為實例，說明了本研究的應用性，在調整壩體結構後，土砂管理效果顯著提升。開放式、可調式橫桿防砂壩的靈活運作，為河川系統的永續土砂管理提供了一種有前景的方法，能夠在災害防治與生態保育之間取得平衡。 |
| 英文摘要 | Open-type check dams are effective in mitigating sediment-related disasters in mountain regions. Unlike closed-type dams, they do not interrupt sediment transport or ecological continuity. This work reports on flume experiments that explored sediment trapping by truss and beam check dams, focusing on the impact of the relative spacing between the trusses or beams on sediment capture. We assessed the ability of adjustable check dams to preserve a dynamic sediment equilibrium by modifying the truss or beam spacing. Experiments with various gravel sizes and truss or beam spacings revealed that a smaller spacing results in a significant reduction in the proportion of sediment passing through the dam, whereas a larger spacing facilitates sediment transport through the dam. The two dam types showed different behaviors. Beams were more effective than trusses in trapping sediment, particularly at relative spacings of between 1.5 and 2.3, with the difference in sediment retention between the two types of dam reaching 43%. A practical case study of an adjustable beam check dam on Dongzhuang Stream in southern Taiwan illustrated the applicability of our research, where sediment management was notably enhanced following adjustments to the dam structure. The flexible operation of open-type, adjustable beam check dams presents a promising approach for sustainable sediment control in fluvial systems, enabling a balance between disaster mitigation and ecological conservation. |
| 發表成果與本中心研究主題相關性 | 開放式防砂壩與可調式防砂壩的研究與應用，與永續農業創新發展中心的目標高度相關，以下從幾個層面說明其關聯性： 1. 土砂管理與農業永續：開放式防砂壩的設計理念強調土砂動態平衡，避免傳統封閉式壩體造成的土砂阻斷問題。這種設計不僅能有效攔截土砂，減少下游土石流災害，還能維持土砂的自然運移，為下游農田提供穩定的土壤養分補充，促進農業生產的永續性。 2. 生態保育與農業環境友善：傳統防砂壩常因阻斷河川生態連續性，對魚類洄游及河床底棲生物造成破壞。而開放式防砂壩與可調式防砂壩則兼顧了生態保育，允許水生生物自由遷徙，維持河川生態系統的完整性。 3. 防災與農業基礎設施保護：山區農業面臨的挑戰之一是極端氣候引發的土石流與洪水災害。開放式防砂壩能有效減少土石流的尖峰流量，降低對下游農田及基礎設施的破壞風險。 開放式與可調式防砂壩的研究與應用，為永續農業創新發展中心提供了重要的技術支持。這些壩體不僅能有效防災，還能促進土砂動態平衡、生態保育及低碳發展，為農業永續與環境友善提供了全新的解決方案。 |
