玉龙雪山白水河1号冰川消融期表面流速特征分析

2016年7月15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2016年7月-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。

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

On July 15, 2016, 16 stakes were set up on the surface of the Baishui Glacier No. 1 in Yulong Moun-tain, in order to establish a network for survey glacial movement velocity Handheld difference GPS, Trimble-GeoXT, 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.