坡地土砂災害之地貌因子綜合判釋;Recognition of the susceptibility of hydrogeomorphic processes through morphometric indicators

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题名:	坡地土砂災害之地貌因子綜合判釋;Recognition of the susceptibility of hydrogeomorphic processes through morphometric indicators
作者:	黃棨霠;Huang, Ci-Yin
贡献者:	土木工程學系
关键词:	土石流;陳有蘭溪;旗山溪;流域險峻值;平廣溪
日期:	2017-07-26
上传时间:	2017-10-27 12:16:01 (UTC+8)
出版者:	國立中央大學
摘要:	本研究使用高解析數值地形模型萃取新北市平廣溪、南投陳有蘭溪及高雄旗山溪等集水區之地文參數，以了解土石流潛勢溪流之集水區內溢流點、致災規模及影響範圍等關係。三個流域之河流級序大多以一級與二級河流為主，一、二級河流級序河流長度占整個集水區總比例分別為:平廣溪流域 (80.5%)、陳有蘭溪流域(81.4%)及旗山溪流域(86.8%)；一級與二級河流級序河流數目占整個集水區總比例分別為:平廣溪流域 (94.5%)、陳有蘭溪流域(95.9%)及旗山溪流域(97.5%)。三個集水區內之土石流潛勢溪流的地貌參數以各子集水區流域長(L)與流域險峻值(MR) 來判定土石流潛勢溪流具有可行性，而主流則以洪水災害為主，容易發生較大範圍之溢淹或河堤沖毀災情。旗山溪與陳有蘭溪現有土石流潛勢溪流疊合分析結果，陳有蘭溪流域現有土石流潛勢溪流有50 條，分析結果47 條為土石流、3 條為高含砂水流；旗山溪流域現有土石流潛勢溪流有55 條，分析結果50 條為土石流、1 條為洪水、4 條為高含砂水流;The morphometric parameters associated with landslides and debris flows in Ping-Guang watershed is .analyzed in this study by employing the 1-m high-resolution and 5-m high-resolution digital terrain map and field studies. Using the Nantou Chenyulan River watershed and Kaohsiung Chishan River Watershed potential debris flow hazard torrent to verify the data. The total length of the first- and second-order streams present 80.5 % of the Ping-Guang watershed, present 81.4 % of the Chenyulan watershed and present 86.8% of the Chishan watershed. The total number of the first- and second-order streams present 94.5 % of the Ping-Guang watershed, present 95.9 % of the Chenyulan watershed and present 97.5% of the Chishan watershed. The morphometric parameters such as Melton Ratio and drainage length are applied to identify the debris-flow prone ravines. However the use of Melton Ratio combined with drainage length analysis results that are not classified as debris flow causes may be affected by slope, the geological or protected targets.
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