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題名 | 匹亞桑溪集水區土石流事件之規模探討=Discussion on the Magnitude of Pi-Ya-Sang Creek Watershed Debris Flow Events |
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作者 | 陳文福; 吳士杰; 蔡明波; Chen, Wen-fu; Wu, Shih-jie; Tsai, Ming-po; |
期刊 | 水土保持學報 |
出版日期 | 20110900 |
卷期 | 43:3 2011.09[民100.09] |
頁次 | 頁311-320 |
分類號 | 436.124 |
語文 | chi |
關鍵詞 | 航空影像; 數值地形模型; 地形變遷; 土石流規模; Aerial photo; Digital elevation model; Landform change; Magnitude of debris flows; |
中文摘要 | 本研究以大甲溪支流匹亞桑溪集水區為研究區域,運用災後航空影像製作數值地形模型 (DEM),並比對不同時期的數值地形模型,推求土砂移動造成地形變遷之變異量,且參考與比 較國外兩位學者於土石流規模分類方面之研究,探討何者較適用於本研究區域之規模分級,做 為未來防災及減災措施之參考。研究結果發現,於2004年敏督利颱風期間,發生之土石流總體 積為240萬m3,其土石流規模在Takahashi分類法中位於第四級,在Jakob分類法中則已超過其礫 石型土石流可分級之限度,故未能以Jakob分類法分級。由於Takahashi分類法中,土石流總體 積只要大於15,000 m3即為第四級,而本研究區域之地形變異量分析結果為240萬m3,遠大於 15,000 m3,因此基於數據範圍之考量,Takahashi分類法並不適用於本區。建議尋找更多土石 流規模分類法進行適用性之探討,或蒐集台灣其他區域之土石流規模以因地制宜方式設計適用 於台灣之土石流規模分類法。 |
英文摘要 | The study area was located in the Pi-Ya-Sang creek watershed of the Da-Jia River Basin. The aerial photos were used to build the DEM, then the DEM was compared over several particular periods. In order to infer the variations of the movements of the debris and the changes of the landform, the classifications of magnitude of debris flow events developed by previous researchers were applied to the study area. Results are expected to be used as references of disaster preventing inthe future. The results showed that the total volume of debris flow was 2,400,000 m3 of Typhoon Mindulle in 2004. This magnitude was classified as the fourth grade of Takahashi’s Classification and over the bouldery debris flow scale of the limitation of the Jakob’s Classification. As a result, the Jakob’s Classification was not applicable in the study area. The total volume of debris flow was more than 15,000 m3 and belonged to the fourth grade in Takahashi’s Classification. However, the landform variation was 2,400,000 m3 of the study area which was far beyond 15,000 m3. Considering the significant difference between the orders of computed magnitude and grade limitation of Takahashi’s Classification, we concluded the Takahashi’s Classification was not suitable for this study area. The previous magnitude classifications of debris flow needed to modify in order to fit the local factors of the study area. Collecting the magnitude of debris flow in other regions of Taiwan, and designing the debris flow magnitude classification are suggested to take action in the future. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。