Ground Penetrating Radar

Blindow, N.; Eisenburger, D.; Illich, Bernhard; Petzold, H.; Richter, Thomas

doi:10.1007/978-3-540-74671-3_10

Cited by 18 publications

(14 citation statements)

References 40 publications

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“…Georadar oddaja kratke pulze elektromagnetnega (EM) valovanja v podpovršje, kjer se del vpadnega valovanja odbije (refleksija) zaradi kontrasta dielektričnih lastnosti na meji različnih snovi (Blindow et al, 2007). Globinski doseg georadarja je poleg električnih lastnosti materiala v največji meri odvisen od frekvence oddajnih anten, zato se v praksi glede na ciljno problematiko uporabljajo georadarski sistemi različnih frekvenc.…”

Section: Osnove Delovanja Georadarjaunclassified

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Application of ground penetrating radar in karst environments: An overview

Čeru¹,

Gosar²

2019

Geologija

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Kras kot kompleksen in heterogen sistem predstavlja za georadar velik izziv. Kljub vsemu pa lahko z dobro načrtovanimi georadarskimi raziskavami pridobimo dodatne informacije o plitvem podpovršju, kjer se odvija večina kraških procesov. Zaradi specifičnosti kraškega površja so v uvodnem delu predstavljene nekatere ovire in prilagoditveni pristopi pri raziskavah na krasu. Analiza pregleda objavljene literature je pokazala, da se georadar v kraških okoljih najpogosteje uporablja za zaznavanje jam in območij pogrezanj ter pri preprečevanju nenadnih porušitev tako v urbanih območjih kot tudi pri gradbenih posegih v prostor. Georadar se uporablja tudi pri raziskavah kraških vodonosnikov, epikrasa in raziskavah v kamnolomih. Poleg uveljavljenih aplikacij so predstavljene nekatere še neuveljavljene aplikacije, kot je uporaba georadarja pri raziskavah brezstropih jam in jamskih sedimentov. Glavni namen članka je prikazati in ovrednotiti možnosti uporabe georadarja v različnih kraških okoljih in spodbuditi njegovo uporabo za nekatere nove aplikacije in opozoriti na nujnost interdisciplinarnega pristopa v takšnih študijah.

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Section: Osnove Delovanja Georadarjaunclassified

“…Metoda temelji na penetraciji EM valov, ki jih v kratkih impulzih pošiljamo z oddajno anteno v tla (Davis & Annan, 1989). Del vpadnega valovanja se na meji različnega materiala odbije zaradi različnih električnih lastnosti (Blindow et al, 2007), kjer ga na površju zazna sprejemna antena (sl. 1).…”

Section: Osnove Delovanja Georadarjaunclassified

Application of ground penetrating radar in karst environments: An overview

Čeru¹,

Gosar²

2019

Geologija

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“…Electric permittivity, Ɛ, and electric conductivity, σ, are petrophysical parameters that determine the reflectivity of boundary layers and penetration depth. Generally, the reflection of an electromagnetic wave occurs at boundary layers and its strength is shown by the reflection coefficient, r, which is determined by (Blindow et al, 2007):…”

Section: Principles Of Gprmentioning

confidence: 99%

Application of geophysical tools for tree root studies in forest ecosystems in complex soils

Rodríguez‐Robles¹,

Arredondo²,

Huber-Sannwald³

et al. 2017

Preprint

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<p><strong>Abstract.</strong> While semiarid forests frequently colonize rocky substrates, knowledge is scarce on how roots garner resources in these extreme habitats. The Sierra San Miguelito Volcanic Complex in Central Mexico exhibits shallow soils and impermeable rhyolitic-rock outcrops, which impede water movement and root placement beyond the soil matrix. However, rock fractures, exfoliations, and soil pockets potentially permit downward percolation and root growth. With ground penetrating radar (GPR) and electrical resistivity tomography (ERT), two geophysical methods advocated by Jayawickreme et al. (2014) to advance root ecology, we studied root and water distribution in shallow-rocky-soils and rock fractures in a semiarid forest. We calibrated geophysical images with in-situ root measurements, and then extrapolated root distribution over larger areas. With GPR, we identified fine and coarse pine and oak roots with 6 to 75&#8201;mm diameters at differential depths in soil and fractures; besides, trees anchored their trunks with coarse roots underneath rock outcroppings. With ETR, we tracked monthly changes in humidity at the soil/bedrock interface, which clearly explained spatial root distribution of both tree species. Geophysical methods have enormous potential in elucidating root ecology. More interdisciplinary research could advance our understanding in belowground ecological niche functions and their role in forest ecohydrology and productivity.</p>

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“…1 shows the difference between the desired square wave and the EM Algorithm calculated sum [11]. As a test case, two fictional areas were defined using using a Finite Difference Time Domain (FDTD) [5][6] [7] modelling software package. A proprietary package in development similar in operation to the popular GprMax software package by A. Giannopoulos [8] and GprMax were used to model the defined areas [10].…”

Section: Test Case 1 (Tc1)mentioning

confidence: 99%

Extending Ground Penetrating Radar Imaging Capabilities Through Signal Processing

Tilley¹,

Sadjadpour²,

Dowla³

2017

Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering

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Ground Penetrating Radar (GPR) Imaging is, and has been, a challenge to perfect on deeply buried targets. Developing a method to choose the best single frequency to image an object at depth has taken a back seat to developing better compositing techniques. Several methods have been explored to define a weighting structure to be applied to data taken at many frequencies to solve this problem. None of the methods have explored using an optimization problem solver. In this paper, we explore using the Expectation-Maximization Algorithm (EM), an optimization problem solver, to define the weights used to combine multiple frequency GPR scans of the same target area. Our method exploits the Gaussian Mixture Model feature of the EM algorithm, and shows promise as a measured improvement toward producing a sharper image at depth.

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Ground Penetrating Radar

Cited by 18 publications

References 40 publications

Application of ground penetrating radar in karst environments: An overview

Application of ground penetrating radar in karst environments: An overview

Application of geophysical tools for tree root studies in forest ecosystems in complex soils

Extending Ground Penetrating Radar Imaging Capabilities Through Signal Processing

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