Ecological Agriculture: Ecological Monitoring and Rehabilitation of Agriculture Landscapes【Department of Soil Water Conservation / Chen, Su-Chin / Distinguished Professor】
生態農業：農業地景生態監測及復育【水土保持學系/陳樹群特聘教授】
論文篇名 英文：Upstream morphological effects of a sequential check dam adjustment process
中文：防砂壩調整系列過程及其上游地形效應
期刊名稱 Earth Surface Processes and Landforms
發表年份,卷數,起迄頁數 2021
作者 Chiu, Yu-Fang; Tfwala, Samkele S.; Hsu, Yung-Ching; Chiu, Yen-Yu; Lee, Chen-Yang; Chen, Su-Chin(陳樹群)*
DOI 10.1002/esp.5178
中文摘要 防砂壩拆除過程造成之泥沙沖刷和地形反應尚不清楚。本研究先以室內試驗揭示了防砂壩調整的三個階段(深化、拓寬和體積釋放)後，臺灣中部蘭島溪一座建於2007年之防砂壩在2015年進行了調整，移除了中間的橫桿，並將中間之縱柱下切了2.5公尺(階段1 + 2)，其目的是調節輸沙量，使河槽保持在河道中心位置，同時防止坡腳侵蝕。2019年，拆除了四個中心縱柱(階段3)，以增加沉積物釋放量。在2015年的初步調整後至2020年間，使用無人機(uav)進行年度調查。防砂壩的調整顯示河道已經變窄和穩定，河岸植被的重生證明了這一點。此外，在靠近防砂壩的河槽坡腳處形成了明顯的階地。調整後上游彎道減弱。本研究將室內試驗與現場實際觀測相結合，對防砂壩退役具有重要意義。此外，這項研究還說明了調整型防砂壩如何有助於泥沙輸送的調節和泥沙平衡，可以根據渠道條件進行相應的調整。
英文摘要 Sediment flushing and the morphological responses to the procedure of check dam removal are still unclear. Following laboratory experiments that revealed three stages (deepening, widening, and volume release) of check dam adjustment, a check dam built in 2007 at Landao Creek in central Taiwan was adjusted in 2015 by removing central bars and cutting 2.5 m from the middle two piers (stage 1 + 2), with the purpose of regulating sediment transfer and keeping the thalweg at the center of the channel, while also preventing hill slope toe erosion. In 2019, four central piers were removed (stage 3) to increase the volume of sediment released. Annual surveys were conducted after the initial adjustment in 2015 through to 2020 using unmanned aerial vehicles (UAVs). The check dam adjustments revealed that the channel had narrowed and stabilized as indicated by regenerating riparian vegetation. Additionally, distinct terraces had formed on the hill slope toes of the creek channel in proximity to the check dam. The meander upstream weakened following the dam adjustments. This study combining laboratory experiments with actual field observation contributed immensely to check dam decommissioning. Additionally, this study illustrated how an adjustable check dam may aid regulation of sediment transport and thereby sediment balance. It can be adjusted accordingly based on the prevailing channel condition.
發表成果與本中心研究主題相關性 調整型防砂壩的理論與應用，可永續經營台灣的溪流生態與土砂平衡，為本中心的核心價值。