Holocene fluvial landscape evolution driven by sea level and tectonic controls in the Gangkou River, Hengchun Peninsula

IF 0.8 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Jia-hong Chen, S. Chyi, J. Yen, Lih-Der Ho, C. Lüthgens, Pei-Ling Wang, Li‐Hung Lin, I. Yen, C. Jen, J. Huang
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引用次数: 0

Abstract

The fluvial landscape of the Hengchun Peninsula in southernmost Taiwan is generally characterized by a narrow river and a wide valley plain. Such underfit stream features are unusual in tectonically active areas such as Taiwan. In this research, we hypothesize that the relative sea level change since the end of the last glacial period might be the main factor driving the formation of this type of landscape on the relatively recently emerged Taiwan Island. The Gangkou River is among the largest and most pristine rivers on the Hengchun Peninsula, and well-preserved river terraces and bedrock exposures occur along the river and river mouth. Therefore, the Gangkou River was thoroughly surveyed to investigate the factors shaping the landscape and to determine the landscape evolutionary history. Our research indicates that the average uplift rate of the Gangkou River is 1.5 - 1.7 mm yr -1 . Because of the low uplift rate, the rising sea level after the last glaciation caused widespread aggra-dation in the Gangkou River. At approximately 8.0 - 7.7 ka, maximum flooding oc-curred, and the sea level subsequently remained stable, while the aggradation stopped after 7.1 ka. Incision followed, forming the high terraces, and starting in the Little Ice Age, repeated aggradation and incision occurred, forming the low terraces. These processes produced the current landscape of the Gangkou River. Overall, the uplift rates calculated from this research are relatively low in this tectonically active area.
恒春半岛港口河全新世海平面和构造控制下的河流景观演化
恒春半岛位于台湾最南端,其河流景观以窄河宽谷平原为主要特征。这种欠拟合的河流特征在台湾这样的构造活跃地区是不寻常的。在本研究中,我们假设末次冰期结束以来的相对海平面变化可能是在相对较晚出现的台湾岛上形成这种景观的主要因素。港口河是恒春半岛上最大、最原始的河流之一,沿河和河口有保存完好的河流梯田和基岩暴露。因此,本文对港口河进行了深入的调查,探讨了景观形成的因素,并确定了景观演化史。研究表明,港口河的平均抬升速率为1.5 ~ 1.7 mm /年。末次冰期后的海平面上升,由于抬升速率低,造成了港口河的大面积淤积。大约在8.0 ~ 7.7 ka发生了最大洪水,随后海平面保持稳定,而在7.1 ka后停止了沉积。随后是切割,形成高阶地;从小冰期开始,反复发生沉积和切割,形成低阶地。这些过程形成了现在的港口河景观。总体而言,本研究计算的隆升速率在该构造活动区相对较低。
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来源期刊
CiteScore
2.00
自引率
0.00%
发文量
29
审稿时长
4.5 months
期刊介绍: The major publication of the Chinese Geoscience Union (located in Taipei) since 1990, the journal of Terrestrial, Atmospheric and Oceanic Sciences (TAO) publishes bi-monthly scientific research articles, notes, correspondences and reviews in all disciplines of the Earth sciences. It is the amalgamation of the following journals: Papers in Meteorological Research (published by the Meteorological Society of the ROC) since Vol. 12, No. 2 Bulletin of Geophysics (published by the Institute of Geophysics, National Central University) since No. 27 Acta Oceanographica Taiwanica (published by the Institute of Oceanography, National Taiwan University) since Vol. 42.
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