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Environmental & Engineering Geophysics “Looking through a dark glass dimly. ” Insights into groundwater, Environmental & Engineering Geophysics “Looking through a dark glass dimly. ” Insights into groundwater, runoff and the impact of humankind on the environment. © John F. Hermance August 31, 2004

Who uses near surface geophysics? Archaeology Israel Pre Columbian America © John F. Hermance Who uses near surface geophysics? Archaeology Israel Pre Columbian America © John F. Hermance August 31, 2004

Hydrology © John F. Hermance August 31, 2004 Runoff mechanisms Hydrology © John F. Hermance August 31, 2004 Runoff mechanisms

Hydrology © John F. Hermance August 31, 2004 Subsurface features Hydrology © John F. Hermance August 31, 2004 Subsurface features

The geophysicist’s mission: We begin with a blank slate. © John F. Hermance August The geophysicist’s mission: We begin with a blank slate. © John F. Hermance August 31, 2004

Using non-invasive methods, and what other information is available we try to answer. . Using non-invasive methods, and what other information is available we try to answer. . . © John F. Hermance August 31, 2004

Using non-invasive methods, and what other information is available we try to answer. . Using non-invasive methods, and what other information is available we try to answer. . . © John F. Hermance August 31, 2004

What’s in the subsurface? (Some of the questions. ) © John F. Hermance August What’s in the subsurface? (Some of the questions. ) © John F. Hermance August 31, 2004

What’s in the subsurface? (Some of the questions. ) © John F. Hermance August What’s in the subsurface? (Some of the questions. ) © John F. Hermance August 31, 2004

What’s in the subsurface? (Some of the questions. ) © John F. Hermance August What’s in the subsurface? (Some of the questions. ) © John F. Hermance August 31, 2004

What’s in the subsurface? (Some of the questions. ) © John F. Hermance August What’s in the subsurface? (Some of the questions. ) © John F. Hermance August 31, 2004

(Some of the questions. ) © John F. Hermance August 31, 2004 (Some of the questions. ) © John F. Hermance August 31, 2004

Example of a Non-Invasive Geophysical Technique: Ground Penetrating Radar (GPR) © John F. Hermance Example of a Non-Invasive Geophysical Technique: Ground Penetrating Radar (GPR) © John F. Hermance August 31, 2004

Principle of GPR © John F. Hermance August 31, 2004 Principle of GPR © John F. Hermance August 31, 2004

Applying our “composite” moveout correction to trace cross-correlation functions (VTrial = 0. 074 m/ns) Applying our “composite” moveout correction to trace cross-correlation functions (VTrial = 0. 074 m/ns) (But we also. GPR signals recorded along a profile. Plot of need Vrefractor = 0. 122 m/ns) © John F. Hermance August 31, 2004

Delineating a Stratigraphic Horizon: The “geologic” interpretation of ground penetrating radar (GPR) data. © Delineating a Stratigraphic Horizon: The “geologic” interpretation of ground penetrating radar (GPR) data. © John F. Hermance August 31, 2004

Delineating several stratigraphic horizons & bedrock Geophysics that has been done to characterize site: Delineating several stratigraphic horizons & bedrock Geophysics that has been done to characterize site: Seismic refraction, DC resistivity, EM, GPR and gravity. [Seismic interpretation from Jeff Sullivan (personal communication. ). ] © John F. Hermance August 31, 2004

What about infrastructure? © John F. Hermance August 31, 2004 What about infrastructure? © John F. Hermance August 31, 2004

Application of the Magnetic Method to Assess “Missing” Items at a Florist’s Shop. © Application of the Magnetic Method to Assess “Missing” Items at a Florist’s Shop. © John F. Hermance August 31, 2004

© John F. Hermance August 31, 2004 © John F. Hermance August 31, 2004

An alternative way to present GPR data: Time Slice “Plan” or “ 3 D” An alternative way to present GPR data: Time Slice “Plan” or “ 3 D” View Formats. Field Site: Long Island North © John F. Hermance August 4, 2003

Time Slice: 3 D View Field Site: Long Island. Objective: Detect leaching pits. © Time Slice: 3 D View Field Site: Long Island. Objective: Detect leaching pits. © John F. Hermance August 31, 2004

Time Slice: 3 D View Interpretation? © John F. Hermance August 31, 2004 Time Slice: 3 D View Interpretation? © John F. Hermance August 31, 2004

Time Slice: Plan View (w / interpretation) © John F. Hermance August 31, 2004 Time Slice: Plan View (w / interpretation) © John F. Hermance August 31, 2004

Application of the Magnetic Method to Delineate a Buried (Lost) “Vault” at a Fall Application of the Magnetic Method to Delineate a Buried (Lost) “Vault” at a Fall River Mill Site. © John F. Hermance August 31, 2004

© John F. Hermance August 31, 2004 © John F. Hermance August 31, 2004

Environmental & Engineering Geophysics End of Presentation “Looking through a dark glass dimly. ” Environmental & Engineering Geophysics End of Presentation “Looking through a dark glass dimly. ” © John F. Hermance August 31, 2004