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Title: 頭前溪階地之地形學研究
Authors: 張瑞津
Issue Date: Nov-1999
Publisher: 地理學系
Department of Geography, NTNU
Abstract: 頭前溪階地群至今仍殘存之紅壤階地可分為六階,非紅壤階地為三階。紅壤高位階地分布於頭前溪兩岸,以南岸的竹東至新竹間之竹東丘陵區最為發達,紅壤最高面為竹東面,高度280~250公尺,比高約130 ~100公尺,對比為LH。其次為寶山北面、竹東西面、高峰面、仙宮面與關東橋面,前二者之紅壤階面多已侵蝕殆盡,僅餘丘頂殘面,高度為250~230公尺與220~200公尺,階崖均達20公尺,分別對比為LT1與LT2;後三者高度分別為110~100公尺、90~80公尺、70~50公尺,階崖為20公尺、15公尺與10公尺,對比為LT3、LT4與LT5面;北岸之飛鳳山丘陵區最高為飛鳳山,高度462公尺,殘面對此為LH,其次為犁頭山頂部賤留三塊向西緩降的高位紅壤階地,高度由230~150公尺,對比為LT1。非紅壤低位階地則分布於頭前溪南、北兩岸,可分為三段階地,其中南岸的員山面及麻園肚面較廣,高度為55~40公尺、45~30公尺,階崖為5公尺、3~5公尺,對比為FT2與FT3面,而FT1之員崠子面殘留甚少。北岸之穹林面與竹北面高度分別100~90公尺及80~20公尺,階崖5~10公尺與3~5公尺,對比為FT1與FT3。本區階地受到新期構造如新竹斷層、新城斷層、竹東斷層與寶山背斜、青草湖背斜等的影響,其中以新竹斷層及新城斷層對階地的影響最為明顯,例如新城斷層通過LT3、LT4與LT5,各造成40公尺、35公尺與25公尺之斷層崖,至於低位階地FT2則有數公尺的斷崖;新竹斷層通過LT5與FT2面,各造成10公尺與2公尺的斷崖,且影響LT5階面向南傾動。本研究根據階地分布、地形特徵及地形面對比推測,頭前溪地形演育如下:更新世中期頭前溪形成LH面,因受台灣島新期構造運動的隆升,造成頭前溪向北依次遷移下切,而新期構造運動中,斷層活動則至少持續至FT2。
River terraces have existed along Tou-chien River can be recognized nine surfaces includ-ing six lateritic surfaces and three non-Jateritic surfaces. They are correlated as LH, LT and FT in the geomorphic surface system of Taiwan. The terraces have been metamorphosed by recent movement for example, lateritic terraces uplifted and formed 25-40 meters fault scarp by Hsin-cheng fault whereas 10 meters in lower non-lateritic terrace. The terraces of LT5 are titled to south by Hsin-chu fault. According to the results of terrace correlation, Tou-chien River shift-ed from south to north since late Pleistocene by the effect of Hsin-cheng fault. The evidence of fault scarp revealed that the neotectonic movement kept since LT3 to FT2 at least.
Other Identifiers: 932DD4A1-BE40-C990-566B-163D0582F554
Appears in Collections:地理研究

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