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玉龙雪山白水河1号冰川消融期表面流速特征分析

燕兴国, 何元庆, 王世金, 牛贺文, 张松林, 朱国峰, 石晓非, 齐翠姗   

  1. 1. 西北师范大学
    2. 中国科学院西北生态环境资源研究院
    3. 兰州大学
    4. 兰州大学
  • 收稿日期:2017-02-02 修回日期:2017-05-31 出版日期:2018-03-14
  • 通讯作者: 张松林
  • 基金资助:
     

Analysis of surface flow velocity on the Baishui Glacier No.1 during ablation period in the Yulong Snow Mountain

    

  1.  
  • Received:2017-02-02 Revised:2017-05-31 Online:2018-03-14
  • Supported by:
     

摘要: 2016715号在玉龙雪山白水河1号冰川表面布设了16根花杆(stakes),建立了冰川运动速率观测网;用TrimbleGeoXT型手持差分GPS对花杆位置坐标进行测量,获取了20167—10月玉龙雪山白水河1号冰川花杆的观测数据,并分析其表面运动特征。结果表明:冰川运动速度方面,横剖面上由主流线附近向两侧变小;纵剖面上由末端到冰川粒雪盆逐渐减小,与一般山岳冰川的运动规律不同;冰川运动方向上,速度矢量大多沿主流线向下运动或者稍微偏离主流线一定方向;冰川的运动速度与冰川的消融速度变化不同步,相比之下运动速度的变化有一定的滞后性;强烈发育的冰裂隙分隔了两侧的冰体,影响了冰川的整体运动方式,使该冰川的运动方式较为特殊。冰川末端退缩速度不断加快且退缩趋势将持续。

关键词: 玉龙雪山, 白水河1号冰川, 消融期, 表面流速

Abstract: On July 15, 2016, 16 stakes were set up on the surface of the Baishui Glacier No.1 in Yulong Snow Mountain, in order to establish a network for survey glacial movement velocity Handheld difference GPS, TrimbleGeoXT, was used to survey the positions of these stakes. The displacement data of these stakes, from July to October in 2016, were collected and analyzed. The results show that: (1) in a transverse profile the velocity of glacier flow was larger in the mainstream line than that in both sides; in a longitudinal profile, the velocity of glacier flow gradually decreased  from the terminus to the firn basin, which was different with general mountain glaciers; in the direction of glacier movement, the velocity vector is mostly moving down along the mainstream line or slightly off the mainstream line; (2) the flow velocity of the glacier was not synchronized with the change of the ablation speed of the glacier, having a lag; (3) the strongly developed ice crevasses divided the ice bodies, affecting the overall flow of the glacier and making the flow of the glacier more special; (4) the retreat speed of the glacier terminal will continue to accelerate and the retreat  trend will continue.

Key words: Yulong Mountain, Baishui Glacier No.1, ablation period, surface flow velocity

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