天山博格达峰地区四工河4号冰川雷达测厚与冰储量估算

Sounding the Sigong River Glacier No.4 in Mt.Bogda Area, the Tianshan Mountains by Using Ground Penetrating Radar and Estimating the Ice Volume

2009年7月对天山博格达峰地区的四工河4号冰川进行了雷达测厚工作,获取了该冰川的厚度分布状况.基于该冰川的厚度数据,在GIS技术的支持下,采用Co-Kriging插值方法结合理想塑性体理论对冰川非测厚区域的厚度进行了重建,绘制出了冰川厚度等值线图并对冰川冰储量进行了计算.结果表明:冰体最大厚度出现于海拔3 775m趋于主流线位置,冰川平均厚度为27.6m;四工河4号冰川的冰储量为0.076 km3.将2009年四工河4号冰川表面地形图与冰川厚度分布图相结合,绘制出了该冰川的冰床地形图.结果显示,在冰体厚度最大的区域,冰床地形呈现凹陷状,这与其相对平缓的冰面地形形成明显对比.

In July 2009,the Sigong River Glacier No.4 in Mt.Bogda of the Tianshan Mountains was sounded by Ground Penetrating Radar for searching the ice thickness of the glacier.It is found that the maximum ice thickness of the glacier was 104.9 m.According to the positioning data of GPS,the thickest part of the glacier was found at the location near the main flow line of the glacier at about 3 775 m a.s.l.Based on the sounding,the ice thicknesses in other places without directly sounding can be estimated by using the Co-Kriging interpolation method,combining with the theory of the perfect plastic material,under the technological support of Geographic Information System.Thus the ice thickness isoline map of the glacier was obtained and the average ice thickness was calculated to be about 27.6 m.The ice volume of the glacier was estimated to be about 0.076 km3.Furthermore,the topography of the glacier bed was mapped by using the topography map of the glacier surface in 2009 and the ice thickness isoline map.From the topography map of the glacier bed one can see that the bed topography has a depressed zone in the thickest part of the glacier,different to the topography of the glacier surface.