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題 名 | 遷急點的地形意義及其研究=Geomorphic Significance and Studies of Knickpoints |
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作 者 | 吳麗娟; 鄧國雄; | 書刊名 | 中國地理學會會刊 |
卷 期 | 28 2000.07[民89.07] |
頁 次 | 頁273-289 |
分類號 | 351.81 |
關鍵詞 | 遷急點; 成因; 形態; 演育; Knickpoint; Morphology; Genesis; Evolution; |
語 文 | 中文(Chinese) |
中文摘要 | 遷急點係河流縱剖面上坡度不連續或突然改變的轉折點,其存在常反應構造運動、氣候改變及地層岩性間的複雜關係,影響河谷地形的演育。遷急點的分布地點多發生在節理作用顯著,床岩抗蝕力強、崩塌堆積及支谷沖積旺盛之處,且與地層走向和河流流向間的夾角有關。遷急點的成因為基準面改變、斷層活動、堰塞作用、地層抗力、岩性變化及人工造壩等。 遷急點形態的組成元素常包括:(1)遷急面上的過陡河段、(2)遷急面、(3)下游的瀑潭及堆積河段。硬岩遷急點的形態和演育的變化主要受地層差異、岩床厚度和節理作用的影響,且遷急點的侵蝕首先發生在遷急緣。 遷急點演育當中,後退速率扮演了重要的角色,主要受制於河流的搬運力、下游說積物的堆積量、基準面的變動量及地層的抗力大小。一般後退的遷移方式有三種:平行、置換及傾斜類型。遷移的距離則受遷急點比高、地層傾角及抗蝕性岩層延宕作用等的影響。 |
英文摘要 | A Knickpoint is a breakpoint in the longitudinal profile of a stream. It is usually complex response to tectonic movement, climate change, bedrock resistant, and controll river valley evolution. Knickpoints distribution are influenced by joint frequency, lithologic layering, colluvium from valley slope, alluvium from tributaries, and the interangle relations between strata strike and stream-f1ow direction. Knickpoints always formed by baselevel change, faulting, bedrock resistant, barrier effect, and artificial dam etc.. Knickpoint morphologic elements always includes: (l)An oversteepened reach above the knickpoint face, (2)knickpoint face, (3)plunge pool and depositional reach at downstream. Variations in morphology and evolution of hardrock knickpoints do occur primarily in response to differences in stratigraphy, bedthickness, and jointing. In additional, erosion take place on knickpoint lip at first. Knickpoint retreat rate plays an important role during longitudinal profile evolution, which controlled by stream-f1ow energy, sediments amount in the dowmstream, baselevel change degree and bedrock resistant. In general, Knickpoints retreat manner have three types : parallel, replacement and inclination. The migration distance is subjected to drop height of Knickpoint, dip of bedrock and resistance lag effect etc.. |
本系統中英文摘要資訊取自各篇刊載內容。