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/馮正一教授、陳樹群特聘教授】
| 論文篇名 | 英文：Numerical Simulations using iRIC Nays2DH for Sediment Transport Behaviors in Dam Breach Tests 中文：使用 iRIC Nays2DH 進行潰壩試驗中泥沙輸送行為的數值模擬 |
| 期刊名稱 | Water |
| 發表年份,卷數,起迄頁數 | 2024, 16(22), 3205 |
| 作者 | Feng, Zheng-Yi(馮正一); Chen, Zhi-You; Chen, Su-Chin(陳樹群)* |
| DOI | 10.3390/w16223205 |
| 中文摘要 | 在土石壩體破壞後，潰口處的沉積物將被破壩洪水攜帶向下游運動。洪水也會侵蝕河道，導致河床載運輸。本研究進行了三個大規模壩體破壞試驗，以調查壩體破壞後的沉積物運輸行為。為了了解沉積物運輸行為，溪流渠道的地形在壩體破壞試驗前後進行了測量。使用 iRIC Nays2DH 軟體對壩體破壞試驗的沉積物運輸進行了模擬。模擬重點包括三種類型的試驗設置：單一壩體、帶有丁壩的單一壩體以及雙壩體模型。數值模型輸入的地形（數值高程模型，DEM）根據 LiDAR 結果指定，並應用了壩體破壞試驗期間的流量水文圖。模擬的準確性通過「覆蓋指數」與「平均絕對百分比誤差」進行評估。還進行了數值參數研究，以找出影響模擬的主要參數。結果顯示，iRIC Nays2DH 模擬有效地捕捉到了壩體破壞過程中水流和沉積物的動態行為，但存在一些限制。在三種類型的壩體破壞中，單一壩體案例中洪水的平均流速最快。由於丁壩導致溪流渠道收縮，當地發生嚴重侵蝕，並且在狹窄區段流量增加。雙壩體破壞中，第一次壩體破壞後兩壩之間的積水以及隨後的第二次壩體破壞也得到了良好的模擬。本研究的發現和模擬有助於更好地解釋壩體破壞，並可提供研究壩體破壞洪水期間沉積物運輸的研究人員參考。 |
| 英文摘要 | After the breach of a landslide dam, the sediment in the breach opening will be carried downstream by the breach flood. The river channel will also be eroded by the flood, resulting in bed load transport. Three large-scale dam breach tests were conducted to investigate the sediment transport behavior after a dam breach. The topography data of the creek channel were measured before and after the dam breach tests to understand the sediment transport behavior. The sediment transport simulations of the dam breach tests were conducted using the iRIC Nays2DH software. The simulations focused on three types of test setups: the single dam, single dam with a spur dike, and double dam models. The terrain (DEM) for the numerical model input was designated based on the LiDAR results, and a flow hydrograph during the dam breach tests was applied. The accuracy of the simulations was assessed using the “coverage index” and “mean absolute percentage error”. A numerical parametrical study was performed to find the major parameters that influenced the simulations. The results showed that the dynamic behavior of water flow and sediment during the dam breach processes were effectively captured by the iRIC Nays2DH simulation, but with limitations. The average flow velocity of the flood in the single dam case was the fastest among the three types of dam breaches. Due to the contraction of the creek channel caused by the spur dike, severe erosion occurred locally, and the flow rate increased in the narrowed section. Water impoundment between the two dams after the first dam breach and the consequent breach of the second dam were also well-simulated for the double dam breach. The findings and simulations in this study help explain dam breaches better and can guide researchers working on sediment transport during dam-breach floods. |
| 發表成果與本中心研究主題相關性 | 農村地區邊坡穩定的分析 |
