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ISSN 2096-7780 CN 10-1665/P

曾京, 黄飞鹏, 吴中海. 基于构造地貌指数的金沙江干流涛源古湖的成因探讨[J]. 地震科学进展 . DOI: 10.19987/j.dzkxjz.2023-172
引用本文: 曾京, 黄飞鹏, 吴中海. 基于构造地貌指数的金沙江干流涛源古湖的成因探讨[J]. 地震科学进展 . DOI: 10.19987/j.dzkxjz.2023-172
Zeng Jing, Huang Feipeng, Wu Zhonghai. Discussion on the genesis of Taoyuan paleolake in the main stream of Jinsha River based on tectonic geomorphology index[J]. Progress in Earthquake Sciences. DOI: 10.19987/j.dzkxjz.2023-172
Citation: Zeng Jing, Huang Feipeng, Wu Zhonghai. Discussion on the genesis of Taoyuan paleolake in the main stream of Jinsha River based on tectonic geomorphology index[J]. Progress in Earthquake Sciences. DOI: 10.19987/j.dzkxjz.2023-172

基于构造地貌指数的金沙江干流涛源古湖的成因探讨

Discussion on the genesis of Taoyuan paleolake in the main stream of Jinsha River based on tectonic geomorphology index

  • 摘要: 涛源古湖位于金沙江干流,构造活动强烈的青藏高原东南缘,其复杂的地质构造背景极易引发地震、滑坡、堰塞湖等链式地质灾害。为了进一步分析金沙江干流滑坡堵江形成堰塞湖的原因,本研究利用30 m分辨率的DEM数据和ArcGIS空间分析技术,提取沿金沙江干流的涛源古湖及其邻区坡度、地表起伏度、面积高程积分和流域陡峭系数等构造地貌指数,并与非构造因素(降水和岩性)对比发现:以寨子村古滑坡为分界点,金沙江上游湖相沉积区与下游地区的构造地貌差异显著;此外,结合前人研究成果分析,进一步印证了程海断裂的构造活动是形成寨子村滑坡及周边地区构造地貌差异性的主要影响因素,滑坡之后造成的堵江也是形成涛源古湖的主要原因,间接反映了沿河道的构造地貌异常变化区域容易发生滑坡事件。

     

    Abstract: The Taoyuan paleo-lake is located at the main stream of the Jinsha River, on the southeastern edge of the Qinghai-Tibet Plateau, a region characterized by intense tectonic activity. This complex geological setting is highly prone to triggering a cascade of geological disasters, including earthquakes, landslides, and dammed lakes. To further analyze the causes why the main stream of JinSha River landslide-induced river blockages that form dammed lakes, this study utilized 30 m resolution DEM data and ArcGIS spatial analysis technology. This allowed for the extraction of tectonic geomorphological indices along the Jinsha River's main stream at Taoyuan paleo-lake and its adjacent areas, including slope, relief degree of ground surface, hypsometric integral, and river steepness index. These indices were compared with non-structural factors (precipitation and lithology) to discover significant differences in tectonic geomorphology between the upstream lacustrine sedimentary areas and downstream areas of the Jinsha River, with the paleo-landslide at Zhaizi Village serving as a dividing point. In addition, combined with the analysis of previous research findings, it further confirmed that the tectonic activity of the Chenghai fault is the primary factor influencing the formation of the Zhaizi Village landslide and the differences in tectonic geomorphology in the surrounding areas, the blockage of the river caused by the landslide is also the main reason for the formation of Taoyuan paleo-Lake. This indirectly reflects that regions with abnormal changes in tectonic geomorphology along rivers are prone to form landslides.

     

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