Strong scattering of radio waves by a two-layer medium with rough boundaries and inhomogeneous permittivity of the layer

1995 ◽  
Vol 38 (7) ◽  
pp. 409-416
Author(s):  
S. F. Pimenov ◽  
M. A. Rudenko
Keyword(s):  
Radio Waves ◽  
Layer Medium ◽  
Rough Boundaries ◽  
Strong Scattering

scholarly journals Anisotropic radio-wave scattering from englacial water regimes, Mýrdalsjökull, Iceland

2007 ◽  
Vol 53 (182) ◽  
pp. 473-478 ◽  
Author(s):  
Kenichi Matsuoka ◽  
Throstur Thorsteinsson ◽  
Helgi Björnsson ◽  
Edwin D. Waddington
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Flow Direction ◽  
Low Frequency ◽  
Radio Waves ◽  
Glacier Surface ◽  
Ice Flow ◽  
Scattering Model ◽  
Water Regimes ◽  
Strong Scattering

AbstractColinear-polarized 5 MHz radar profiling data were obtained on Mýrdalsjökull, a temperate glacier in Iceland. Radar transects, and therefore polarization planes, were aligned approximately parallel, transverse and oblique to the ice flow direction. Echoes from the shallower half to two-thirds of the ice were 10–20dB stronger on the oblique and longitudinal transects than those on the transverse transects. Anisotropy as a function of depth is clearly seen at the sites where the transects cross. Strong scattering on longitudinal transects apparently caused extinction of a radar-reflecting layer that was continuously profiled on the transverse transects. A radio-wave scattering model shows that scattering from a longitudinal water-filled conduit parallel to the glacier surface can explain the observed azimuthal variations of the echo. We conclude that low-frequency (~MHz) radio waves can help to characterize englacial water regimes.

Scattering of radio waves by a two-layer medium with a weakly reflecting rough boundary

1998 ◽  
Vol 41 (7) ◽  
pp. 600-609
Author(s):  
M. V. Kachan ◽  
S. F. Pimenov ◽  
N. A. Stepanova
Keyword(s):  
Rough Boundary ◽  
Radio Waves ◽  
Layer Medium

scholarly journals STRATIGRAPHY OF WANDA GLACIER, KING GEORGE ISLAND, ANTARCTICA, USING GROUND PENETRATING RADAR

2014 ◽  
Vol 32 (1) ◽  
pp. 21 ◽  
Author(s):  
Kátia Kellem da Rosa ◽  
Guilherme Borges Fernandez ◽  
Thais Baptista da Rocha ◽  
Felipe Lorenz Simões ◽  
Rosemary Vieira ◽  
...  
Keyword(s):  
Internal Structure ◽  
Thermal Regime ◽  
Ground Penetrating Radar ◽  
Thermal Conditions ◽  
Radio Waves ◽  
King George Island ◽  
Ablation Area ◽  
Ground Penetrating ◽  
Subglacial Meltwater ◽  
Strong Scattering

ABSTRACT. We present the results of a high-frequency Ground Penetrating Radar (GPR) surveys carried out during the ablation season of 2011, in Wanda Glacier, King George Island (KGI), Antarctica, aimed to determine its internal structure and thermal regime. GPR data were collected along 17 longitudinal and transversal sections in the ablation area in January 2011. Migrated and topographically corrected radar sections show strong internal reflectors in firn layer. Similar internal structure is observed in other glaciers in KGI. Strong scattering of radio waves are attributed to supraglacial, englacial and subglacial meltwater channels and constitutes further evidence that the ice in the ablation area of this glacier is temperate. Because of its small size (1.5 km2) and thermal conditions, Wanda Glacier responds rapidly to climatic changes being relevant for environmental studies. Keywords: glaciology, thermal regime, glacial dynamic.    RESUMO. O trabalho apresenta resultados de dados de GPR de alta frequência obtidos durante a estação de ablação de 2001, na geleira Wanda, Ilha Rei George (KGI), Antártica, com o objetivo de determinar a estrutura interna e o regime termal. Dados de GPR foram coletados em 17 perfis longitudinais e transversais na área de ablação em janeiro de 2011. Perfis de radar topograficamente corrigidos e migrados mostram fortes refletores internos na camada de firn . Estruturas similares foram observadas em outras geleiras da KGI. Fortes espalhamentos das ondas de rádio são atribuídas a canais de água de degelo nas zonas subglaciais, supraglaciais, e englaciais e constituem evidências para que o gelo na zona de ablação seja temperado. Devido à sua pequena dimensão (1,5 km2) e condições termais, a geleira Wanda responde rapidamente as mudanças climáticas, o que é relevante para estudos ambientais. Palavras-chave: glaciologia, regime termal, dinâmica glacial. 

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