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| Titel |
Monitoring snow cover melting, shallow freezing and thawing processes using off-ground ground-penetrating radar |
| VerfasserIn |
Khan Zaib Jadoon, Sébastien Lambot, Lutz Weihermüller, Marin Dimitrov, Jan van der Kruk, Harry Vereecken |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052685
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| Zusammenfassung |
| We present a new approach to monitor shallow freezing and thawing processes during snow fall and melting by using off-ground ground-penetrating radar (GPR). The radar system is based on international standard vector network analyzer technology combined with an air-raised monostatic horn antenna. The GPR model used a full-waveform frequency-domain solution of Maxwell’s equations for wave propagation in three-dimensional multilayered media. The GPR model describes the wave propagation in the antenna-air-soil system, including antenna-soil interactions. The surface of bare soil was exposed to natural process (e.g., evaporation and precipitation events) as the radar antenna was mounted 1.1 meter above the ground. The data sets we consider were collected in a field experiment at the Selhausen test site of Forschungszentrum Juelich, Germany, in winter 2010 over a 9-day period in which six freezing and thawing events occurred. To monitor the dynamics of the soil, time-lapse conductivity, permittivity, temperature, and GPR measurements were performed repeatedly with a time step of fifteen minutes. The probes used for the conductivity, permittivity and temperature measurements were installed at seven depths near the footprint of the GPR antennae. All the freezing and thawing events could be visually observed in the GPR data. Full-waveform inversion was performed to estimate the thickness of snow cover and frozen soil layer. Results suggest that off-ground GPR with full-waveform inversion can be used to monitor snow cover melting, shallow freezing and thawing processes in the field. |
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