應用Hyper KANAKO模式模擬建物對土石流溢淹之影響－以臺東縣紅葉村為例

Application of Hyper KANAKO Model to Simulate the Influences of Buildings on Debris-Flow Flooding-A Case Study in Hongye Village, Taitung County

10.6653/MoCICHE.202308_50(4).0011

許汶芳；詹錢登

土石流 ； Hyper KANAKO模式 ； 建物阻擋 ； 溢淹範圍 ； Debris flow ； Hyper KANAKO model ； Buildings obstruction ； Inundation areas

土木水利

50卷4期（2023 / 08 / 01）

67 - 76

繁體中文;英文

本研究使用Hyper KANAKO模式，以紅葉村土石流潛勢溪流（東縣DF166）為模擬對象，探討流路上建物阻擋對土石流溢淹範圍之影響。考量土石流規模、流路上建物存在與否及建物排列形式等不同條件，分成四種方案進行模擬。方案一以2016年莫蘭蒂颱風土石流出流量為輸入條件進行模擬，並將模擬結果與實際土石流溢淹情形進行比對；方案二與三是按土石流流出量與集水區面積關係設定出四種不同土石流可能流出量，模擬無建物（方案二）及有建物（方案三）在此四種不同流出量條件下的溢淹情形；方案四在兩種土石流流出量及四種不同建物排列（三角形排列、倒三角形排列、長矩形排列與寬矩形排列）條件下，探討建物排列形式對於土石流溢淹範圍之影響。方案一的模擬主要用於參數率定及模式驗證，結果顯示土石流溢淹情形的模擬結果與實際狀況約有80%的吻合率，顯示Hyper KANAKO模式具有良好的模擬效果。由方案二與三的模擬結果，可知流路上建物的存在會阻礙土石流的流動，迫使土石流往橫向流動並擴大溢淹範圍。方案四的模擬結果則顯示建物排列形式會影響溢淹範圍，尤其是前段建物的阻擋效應會影響到後續土石流流動方向及溢淹範圍。

This study utilizes the Hyper KANAKO model to investigate the impact of buildings obstructing debris flow paths on inundation areas, using a debris-flow-prone stream in Hongye Village (Taitung DF166) as the simulation target. Four simulation scenarios were conducted under various conditions, including debris flow scale, the presence of buildings along the flow path, and building arrangement configurations. Scenario1 simulates the debris flow caused by Morakot Typhoon in 2016, compared with the actual debris-flow inundation situation. Scenarios 2 and 3 consider four different debris flow discharges, based on the relationship between debris-flow total volume and its corresponding watershed area. These scenarios simulate inundation situations without buildings (Scenario 2) and with buildings (Scenario 3) for these four discharge levels. In Scenario 4, simulations are conducted for two debris flow discharge levels and four different building arrangements to investigate the impact of building arrangements on the debris flow inundation. The outcomes of the Scenario 1 show an approximately 80% agreement between the simulated and actual debris flow inundation areas, demonstrating the effective capability of the Hyper KANAKO model in debris flow simulation. Results from the Scenarios 2 and 3 simulations suggest that the presence of buildings along the flow path obstructs debris flow, compelling it to move laterally and expand inundation area. Results from the Scenario 4 simulation reveal that building arrangements significantly affect the extent of inundation, especially the obstructive effect of upstream buildings impacting the subsequent direction of debris flow and inundation area.

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