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63_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

63_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - and...

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X4 o Ground Penetrating Radar Vertical reflection of radar signal measured over horizontal traverse (vertical slice). Uses color imagery to define reflection strength. Signal penetration depends on antenna size (transceiver and receiver). Good penetration in dry sand, less in clays. Strong reflection from layer boundaries and water table. Saline water essentially blocks further penetration (masks deeper layers). Useful to identify rock surface, water table, sinkholes, and to find anomalies (buried tanks, utilities, graves, drugs, money, vaults). Depth to contact very dubious because transmission speed poorly defined
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Unformatted text preview: and variable. Must perform sounding/boring at location to define depth to a contact. . :-~. ..,:.!J:" .~~, . ", ... .,,;J;L' ..... \W.-._. • "'J"~,' .. :~. • ~;;:" .: .-Ii > .• .. ~ . . . '.. . , " ·.. ~.l ... ~ . .. ~ . . , "J '" • 'I ) J ,. ", I ,I I ' • J \ UNK , \ \ ., l'.lla. .~ GPR equipment at left - assistant towing antenna while operator monitors CRT. Plot at right shows buried tanks at about 4 ft depth. Usually plot is in color. (figure from McCarthy, 1998)...
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