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碩士 === 國立中央大學 === 土木工程學系 === 107 === The morphometric parameters associated with landslides and debris flow ravines in Lanyang River Watershed are analyzed in this study by employing the 5-m high-resolution digital terrain map and field studies. The total length of the first- and second-order stream...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2019
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| Online Access: | http://ndltd.ncl.edu.tw/handle/jz2jj2 |
| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 107 === The morphometric parameters associated with landslides and debris flow ravines in Lanyang River Watershed are analyzed in this study by employing the 5-m high-resolution digital terrain map and field studies. The total length of the first- and second-order streams present the majority of each 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 (MR) combined with drainage length (L) analysis results that are not classified as debris flow causes may be affected by slope, the geological or protected targets. The systemized geomorphic thresholds for debris-flow prone watershed are : debris flows for MR>0.43 and L< 7km；0.3≤MR≤0.43 and L≤14 km , or MR>0.43 and 7km ≤ L≤ 14 km for the coexistence of debris flows and debris floods； MR<0.3 for floods. The fan slope and the Melton ratio can also serve as an indicator for debris-flow ravines。
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