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Georadar Monitoring of the Peretolchin Glacier (Eastern Sayan)
Geography and Natural Resources Pub Date : 2020-07-01 , DOI: 10.1134/s1875372841030099
A. D. Kitov , E. V. Serebryakov , A. S. Gladkov , O. V. Lunina , V. M. Plyusnin , E. N. Ivanov

Abstract For the first time, a monitoring was carried out for assessing the volume of the ice of the Peretolchin Glacier in the Munku-Sardyk mountain range (Eastern Sayan) using georadar profiling both directly to measure the thickness of the ice and to refine the parameters of mathematical models for determining the volume of the glacier. Based on results of the area radar survey, the volume of the various structures of the glacier (firn, the main icy body, and bottom moraines) was assessed. 3D models of these components of the glacier have been constructed. It was found that, in comparison with results of georadar profiling for other glaciers, the modern bed of the Peretolchin Glacier consists of deposits of the previous glaciation which ended 11 ka. Measurements of the ice thickness on the northern Peretolchin Glacier were made in June 2014, and in May 2016 and 2017, with a constant increase in the study area using the Oko-2 radar with the ABDL Triton antenna unit at 100 MHz. Maps of the ice thickness of the Peretolchin Glacier were updated, and its volume was determined, equal to 0.007 ± 0.0001 km3. The section of the glacier of direct study (the lower open part) measures 0.00297 km3. The method of sections, taking into account the relief of the glacier from additional profiles, proved to be the most accurate. In the surveyed portion, the proportion of firn, the ice and the bottom moraine makes up 25%, 29 and 46%, respectively. On the other hand, the proportion of the clean ice reduces from the middle part of the glacier to its bottom. Over more than 100 years, the Peretolchin Glacier (northern) has decreased in length, area and volume by factors of 1.75, 2.9 and 3.71, respectively. It has been established that the rate of reduction of the Peretolchin Glacier has been increasing since 2009.

中文翻译:

佩雷托尔钦冰川(Eastern Sayan)的Georadar监测

摘要 首次使用地球雷达剖面直接测量冰的厚度并细化参数,对 Munku-Sardyk 山脉(东萨彦岭)Peretolchin 冰川的冰体积进行监测。确定冰川体积的数学模型。根据区域雷达调查的结果,评估了冰川各种结构(冷杉、主要冰体和底部冰碛)的体积。已经构建了冰川这些组件的 3D 模型。研究发现,与其他冰川的地球雷达分析结果相比,Peretolchin 冰川的现代床层由结束于 11 ka 的先前冰川作用的沉积物组成。2014 年 6 月对佩雷托尔钦冰川北部的冰层厚度进行了测量,在 2016 年 5 月和 2017 年,使用 Oko-2 雷达和 100 MHz 的 ABDL Triton 天线单元的研究区域不断增加。Peretolchin 冰川的冰厚地图已更新,其体积已确定,等于 0.007 ± 0.0001 km3。直接研究的冰川截面(下部开放部分)为 0.00297 平方公里。考虑到冰川从附加剖面上的起伏,剖面方法被证明是最准确的。在调查部分,杉木、冰和底部冰碛所占比例分别为25%、29%和46%。另一方面,从冰川中部到底部,干净冰的比例逐渐减少。100 多年来,Peretolchin 冰川(北部)的长度、面积和体积分别减少了 1.75、2.9 和 3.71 倍。
更新日期:2020-07-01
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