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冰川冻土 ›› 2021, Vol. 43 ›› Issue (3): 714-723.doi: 10.7522/j.issn.1000-0240.2021.0013

• • 上一篇    下一篇

基于V指数的他念他翁山中段冰川槽谷形态特征及影响因素分析

葛润泽1(),张威1(),李亚鹏1,赵贺1,唐倩玉1,柴乐2   

  1. 1.辽宁师范大学 地理科学学院,辽宁 大连 116029
    2.东华理工大学 地球科学学院,江西 南昌 330127
  • 收稿日期:2021-05-15 修回日期:2021-06-04 出版日期:2021-06-30 发布日期:2021-05-18
  • 通讯作者: 张威 E-mail:771495594@qq.com;zhangweilnu@163.com
  • 作者简介:葛润泽,硕士研究生,主要从事环境演变研究. E-mail: 771495594@qq.com
  • 基金资助:
    国家自然科学基金项目(41671005)

Morphological characteristics and influencing factors of glacial troughs in the middle section of Tenasserim Mountains based on V-index

Runze GE1(),Wei ZHANG1(),Yapeng LI1,He ZHAO1,Qianyu TANG1,Le CHAI2   

  1. 1.College of Geographical Sciences,Liaoning Normal University,Dalian 116021,Liaoning,China
    2.College of Earth Sciences,East China University of Science and Technology,Nanchang 330127,China
  • Received:2021-05-15 Revised:2021-06-04 Online:2021-06-30 Published:2021-05-18
  • Contact: Wei ZHANG E-mail:771495594@qq.com;zhangweilnu@163.com

摘要:

冰川槽谷作为冰川作用区分布最典型的冰川地貌之一,对其形态特征及影响因素的研究,有助于揭示冰川发育的动力学过程。基于V指数模型及MATLAB半自动提取方法,分析并探讨了他念他翁山中段冰川槽谷形态发育特征及造成槽谷形态差异的影响因素。结果表明:研究区共发育206条冰川槽谷,大多为“U”形或偏“U”形,长4.5~26 km之间,平均宽度1.8 km,深200~500 m,海拔高度介于5 730~3 274 m。槽谷形态横向分布规律:V指数多为0.2~0.3,北东向发育V指数大于0.3的谷地多于西南向,说明东坡槽谷侵蚀程度强于西坡。V指数沿槽谷纵向主要有两种变化趋势:V指数增大,冰川槽谷横剖面“U”形发育特点逐渐增强;V指数减小,冰川槽谷横剖面“U”形发育特点减弱。研究区冰川槽谷发育以侧蚀为主,形态的差异性是冰川自身特性、冰川作用区地形与基岩岩性等多种因素共同作用的结果。其中,冰川作用区的平均坡度、平均地形起伏度与古冰川作用区面积是造成这种分布差异的主要因素。

关键词: 他念他翁山, 冰川槽谷, V指数, 形态特征, 影响因素

Abstract:

Glacial troughs are one of the most typical glacial landforms distributed in glaciation areas. The study on their morphological characteristics and influencing factors helps to reveal the dynamic process of glacier development. Based on the V-index model and Matlab semi-automatic extraction method, this paper analyzed and discussed the developmental characteristics of glacier trough and valley morphology and the influencing factors of trough and valley morphology differences in the middle section of Tenasserim Mountains. The results show that there are 206 glacier troughs in the study area, most of which are U-shaped or slightly U-shaped, with a length of 4.5~26 km, an average width of 1.8 km, a depth of 200~500 m, and an altitude of 5 730~3 274 m.The transverse distribution of trough valley morphology is as follows: the V-index is more in the range of 0.2~0.3, and the valley with V-index greater than 0.3 developed in the northeast direction is more than that in the southwest direction, indicating that the erosion degree of trough valley in the eastern slope is stronger than that in the western slope. There are two trends of V-index along the longitudinal direction of the glacier trough. With the increase of V-index, the “U” shape of the cross-section of the glacier trough is gradually enhanced. V-index decreases, and the “U” shaped development of glacier trough and valley section weakens. The development of glacial troughs in the study area is dominated by lateral erosion, and the difference in morphology is due to the interaction of many factors, such as the characteristics of the glacier itself, the topography of the glaciation area and the lithology of the bedrock. Among them, the average slope of glaciation area, the average relief of topography and the area of palaeogeoliation area are the main factors causing the difference of distribution.

Key words: Tenasserim Mountains, glacial trough, V-index, morphological characteristics, influence factor

中图分类号: 

  • P343.6