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題名 | Evolution of River Terraces Along the Lan-Yang River, Northeastern Taiwan: A River Response to Base Level Change=蘭陽溪上游河階演化模式--河流反應侵蝕基準面的變動 |
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作者姓名(中文) | 宋國城; 傅炯貴; 齊士錚; 蔡衡; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:3 1999.08[民88.08] |
頁次 | 頁331-348 |
分類號 | 351.65 |
關鍵詞 | 河階; 地形定年; 擴散模式; 崖坡後退模式; 局部侵蝕基準面; River terrace; Morphological dating; Diffusion equation model; Scarp retreat model; Local base level of erosion; |
語文 | 英文(English) |
中文摘要 | 兩千年以來,台灣東北部的蘭陽溪流域發育了數個沖積扇,這些沖積扇隨後被下 初形成多達六階的河階。野外的剖面測量研究可導出河階崖坡的演化模式,藉此崖坡後退模 式與斜坡擴散模式,本研究區的河階可做區域性的對比,並重建蘭陽溪及其支流的河流縱剖 面演育過程。 從河流縱剖面的演育過程可知本研究區河階的發育主要受局部侵蝕基準面的變動控制。 因沖積扇堆積時產生堰塞作用,導致局部侵蝕基準面的變動,並非氣侯因素或構造抬升所致。 |
英文摘要 | During the last 2000 years, several alluvial fans were formed along the upper reach of the Lan-Yang River, northeastern Taiwan. They were subsequently undercut into different levels of river terraces. Slope profiles of the river terraces were measured in the field to study the evolution of the terrace scarps. River terraces can be chronologically correlated by morphological dating according to the proposed diffusion equation model and scarp retreat model. Evolution of the longitudinal profiles of the Lan-Yang River and its tributaries was reconstructed based on the correlation scheme of the river terraces. The model of evolution suggests that changes in the local base level of erosion play an important role in the formation of the river terraces. The local base level elevation changed as a result of alluvial fan deposition, rather than tectonic uplift or climatic changes. |
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