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：Effective planting arrangement on floodplains to reduce soil loss in a flood regime: study using physical models
中文：利用模型試驗找出最有效的種植方式以減緩高灘地在遭遇洪水時的土壤流失
期刊名稱 Ecological Engineering
發表年份,卷數,起迄頁數 2021, 167
作者 Li, Jin-Fu; Chen, Ye-Hong; Tfwala, Samkele; Chen, Su-Chin(陳樹群)*
DOI 10.1016/j.ecoleng.2021.106258
中文摘要 在台灣，許多高灘地常常被用來做為農業用地，在這些地區耕作的農民必須接受政府的不補償提議，當他們的植物被洪水摧毀時。我們在種植某些種類植物（例如香蕉）的高灘地中觀察到了嚴重的沖刷問題。研究中藉由一系列室內物理模型實驗，找出最佳的高灘地種植方式以減少高灘地上的淘刷問題。試驗中設計了五種不同的間隔距離來觀察植物周圍的三維流場及泥沙運移情形。結果顯示，當植物受到水流沖擊而倒伏時，植物周圍會形成了四個低流速區。其中，以第四低流速區的影響範圍最大。但是，如果植物間距的長度小於倒伏植物的長度，則會產生遮蔽效應。此效應將限制第四低流速帶的出現並減少下游侵蝕。此外，本研究也建議以倒伏植物的一半長度作為縱向間距種植植物，以減少土壤流失。而植物與植物之間的橫向間距也應大於倒伏植物的一半長度，以避免在高灘地上產生束縮沖刷效應。這種種植方法可以同時滿足人類需求（增加利潤）和防止環境破壞（減少侵蝕），以作為高灘地生態的管理策略。
英文摘要 In Taiwan, many floodplains are used for agriculture because flood discharge cannot be blocked, and farmers must be willing to accept the noncompensation offer from the government should their plants be destroyed by floods. Moreover, a scour problem has been observed in floodplains with some kinds of plant, such as bananas. Through a series of laboratory experiments, physical modeling was conducted to develop a planting design to reduce the erosion problem. Five different interval spacings between successive plant models were designed to observe the three-dimensional flow field and sediment transport. The results showed that four low-velocity zones formed around plants when a flood bent them. Among them, the fourth low velocity had the largest influence range. However, if the length of the interval spacing was less than the length of the bent plant, it would cause a shelter effect. This effect would limit the appearance of the fourth low-velocity zone and diminish downstream erosion. In addition, it is suggested that plants be planted using the half length of bent plants as an interval spacing to reduce soil loss. The transverse distance between plant rows should be larger than the half length of the bent plant to avoid contraction scour effects on floodplains. This practical planting method could meet human needs (through added profits) and prevent environmental damage (reduce erosion) simultaneously, making it an effective management strategy for ecological engineers in floodplains.
發表成果與本中心研究主題相關性 藉由找出高灘地上最佳的種植方式，來同時達到滿足人類利益及減少環境破壞，使高灘地上的農業能夠永續經營及利用。