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題名 | 中臺灣造山運動帶河流縱剖面坡降指數的量化分析=A Quantitative Analysis for Gradient Indices of Longitudinal River Profile on the Orogeny of Central Taiwan |
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作者 | 李準勝; 蔡龍珆; Lee, Chun-sheng; Tsai, Louis L.; |
期刊 | 水土保持學報 |
出版日期 | 20090800 |
卷期 | 41:3 2009.08[民98.08] |
頁次 | 頁271-284 |
分類號 | 353.4 |
語文 | chi |
關鍵詞 | 造山運動帶; 坡降指數; 標準化坡降指數; Orogeny; Gradient indices; SL; Normalized gradient indices; SL/k; |
中文摘要 | 本研究的目的是利用河道縱剖面坡降指數的構造地形指標,來解釋造山運動帶中央山脈東 西兩側數個集水區構造地形演化上的特性。研究結果顯示,在中央山脈東側的標準化坡降指數 (SL/k)異常高值可以顯示岩體強度差異、遷急點、連續峽谷等構造地形特徵;中央山脈西側的 異常高值在中至下游和中至上游分別有增大趨勢,主要為受斷層構造活動性之差異所致。由平 面圖觀察,當河流流路切穿斷層的角度愈大,標準化坡降指數(SL/k)愈能夠反應各斷層的活動 性,如中央山脈東西兩側各河流大致呈垂直切穿各斷層的河段;若河流切穿斷層常呈低角度或 近乎平行,使得標準化坡降指數的異常情形較不顯著,不過在郡大溪河道以近乎平行梨山斷層 的河段卻不是如此趨勢,其標準化坡降指數則明顯呈現異常高值,所以南段梨山斷層的活動性 相較於北段地區為大。最後,地質構造在河流長時間的演化過程當中扮演相當重要角色。 |
英文摘要 | The purpose of this study is to explain the implication in evolution of tectonic geomorphology for the River watersheds of Central Range by using gradient indices of longitudinal profile. The results of this study indicated that the abnormal high normalized gradient indices (SL/k) represented variation in rock mass, knick-point and a continuity of gorge to form the characteristic of tectonic geomorphology on the east side of Central Range. There are increase trend for the abnormal high normalized gradient indices (SL/k) form lower- to mid- stream area on the west side of Central Range that were effected by active fault. According to the distributed plot of normalized gradient indices (SL/k), the abnormally high values of SL/k were affected by river and fault intersecting to form a high angle or perpendicular and the abnormally low values of SL/k were affected by river along with a fault or form a low angle, but the channel of Junda River along with Lishan fault is opposite. This shows that the south zone of Lishan fault is significantly more tectonic active than the north zone. Based on quantitative results of these geomorphology indices, this study suggests that the important factor influencing the landscape of tectonic geomorphology of Central Range is tectonic uplift. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。