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冰川冻土 ›› 2022, Vol. 44 ›› Issue (4): 1347-1356.doi: 10.7522/j.issn.1000-0240.2022.0121

• 第四纪与行星冰冻圈 • 上一篇    下一篇

寒冻风化控制的祁连山风化碎屑的空间分布

洪洋1(), 耿豪鹏1,2, 潘保田1,2()   

  1. 1.兰州大学 资源环境学院 西部环境教育部重点实验室, 甘肃 兰州 730000
    2.甘肃省石羊河流域野外科学观测研究站, 甘肃 兰州 730000
  • 收稿日期:2022-07-10 修回日期:2022-08-08 出版日期:2022-08-25 发布日期:2022-09-14
  • 通讯作者: 潘保田 E-mail:hongy17@lzu.edu.cn;panbt@lzu.edu.cn
  • 作者简介:洪洋,博士研究生,主要从事坡面风化与侵蚀过程研究. E-mail: hongy17@lzu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41971001);甘肃省科技厅省级野外科学观测研究站项目(20JR10RA656);中央高校基本科研业务费专项资金项目(lzujbky-2021-it39)

Frost cracking controlled scree spatial distribution in the Qilian Mountains

Yang HONG1(), Haopeng GENG1,2, Baotian PAN1,2()   

  1. 1.Key Laboratory of Western China’s Environmental Systems,Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
    2.Shiyang River Basin Scientific Observing Station of Gansu Province,Lanzhou 730000,China
  • Received:2022-07-10 Revised:2022-08-08 Online:2022-08-25 Published:2022-09-14
  • Contact: Baotian PAN E-mail:hongy17@lzu.edu.cn;panbt@lzu.edu.cn

摘要:

寒冻风化是冰缘地貌区及高寒山区的主要物理风化过程,其提供的风化碎屑物质是该区域崩塌等灾害性地貌过程的主要物质来源。由于寒冻风化对基岩的破碎是由温度控制的累积过程,过去温度变化对地貌演化具有重要意义,但其时间尺度的选取尚需进一步探究。因此本文选取祁连山北部为研究区,通过对比分析风化碎屑的空间分布特征与不同时间尺度温度变化控制的平均寒冻风化强度的空间分布特征,探讨干旱半干旱高寒山区风化碎屑空间分布的主要控制因素。结果显示,万年尺度及十万年尺度平均寒冻风化强度的高值与风化碎屑边界存在较好的空间一致性,祁连山西段万年尺度平均寒冻风化强度的高值与风化碎屑边界的空间相关性优于十万年尺度。本研究同时指出,温度升高导致寒冻风化的作用区向高海拔区域移动,进而产生新的高风险灾害区域。本研究强调寒冻风化对灾害性地貌过程的调控作用,为全球变暖背景下灾害性地貌过程的预测提供了新的思路,可以成为防灾减灾决策的重要参考。

关键词: 寒冻风化, 风化碎屑, 气候变化, 祁连山

Abstract:

Frost cracking is the major physical weathering process in paraglacial environments and alpine mountains. Scree supplied by frost cracking is the major source of hazards such as collapse. The rock damage by frost cracking is an accumulation process controlled by temperature, so the past temperature change means a lot in landscape evolution. But the influence of different temporal scale of past temperature change on spatial distribution of scree in the arid to semiarid alpine mountain is not clear. Here we analyze the spatial correlation of scree and different temporal scale of past temperature change controlled time averaged frost cracking intensity (Fci ) to explore factors that control scree spatial distribution in Qilian Mountains. The results show that there is a good spatial correlation between scree and both 104 and 105 temporal scale temperature change controlled time averaged Fci . In the western Qilian Mountains, the spatial correlation between scree and 104 temporal scale temperature change controlled time averaged Fci is better than that with 105. We also point out that the increase in temperature induces frost cracking moving to high elevation range and generates new areas with high hazard risk. We also highlight the importance of frost cracking in controlling hazards such as collapse. Our research provides a new thought to predict hazards in the background of global warming, our results can be an important reference for disaster prevention and mitigation decisions.

Key words: frost cracking, scree, climate change, Qilian Mountains

中图分类号: 

  • P694