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Environmental & Engineering Geophysics “Looking through a dark glass dimly.” Insights into groundwater, runoff and the impact of humankind on the environment.

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Presentation on theme: "Environmental & Engineering Geophysics “Looking through a dark glass dimly.” Insights into groundwater, runoff and the impact of humankind on the environment."— Presentation transcript:

1 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

20 © John F. Hermance August 31, 2004

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

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

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

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

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

26 © John F. Hermance August 31, 2004

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


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