کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4460421 1621335 2007 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Detection of buried ice and sediment layers in permafrost using multi-frequency Ground Penetrating Radar: A case examination on Svalbard
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات کامپیوتر در علوم زمین
پیش نمایش صفحه اول مقاله
Detection of buried ice and sediment layers in permafrost using multi-frequency Ground Penetrating Radar: A case examination on Svalbard
چکیده انگلیسی

We use multi-frequency Ground Penetrating Radar (GPR) to detect and map buried relic glacier ice and sediments in permafrost. Old aerial photographs 1936–1990 are used to show the origin of a sediment covered ice body, and illustrate how it has been buried. Together with a newly exposed ice/sediment cliff, this serves as excellent ground truthing for the GPR data. Empirical GPR frequency dependent relations are established to quantify the loss of the signal power through the layer of sediment. The loss through ice is in comparison negligible. These relations indicate that the maximum ice pocket detection depth (for this sediment type), with the different GPR systems used, are 90, 150 and 200 ns for the 800, 500 and 200 MHz systems respectively. The electromagnetic (EM) wave velocities calculated from diffractions yield velocities ranging between 0.115–0.135 m/ns for the sediment and 0.15–0.17 m/ns for the ice. With the derived EM wave velocities, these Two-Way-Travel (TWT) times correspond to a depth of ∼ 6, 9 and 13 m respectively. This loss cannot be tested for the 200 and 500 MHz systems due to lack of such a deep sediment layer on top of the ice, but is consistent with the 800 MHz data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Remote Sensing of Environment - Volume 111, Issues 2–3, 30 November 2007, Pages 212–227
نویسندگان
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