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Right arrow Ground Penetrating Radar, GPR
Right arrow Inverse Procedures/Parameter Estimation
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Parameter Estimation for Soil Hydraulic Properties Using Zero-Offset Borehole Radar

Analytical Method

Dale F. Rucker* and Ty P. A. Ferré

Dep. of Hydrology and Water Resources, Univ. of Arizona, Harshbarger Bldg. 11, P.O. Box 210011, Tucson, AZ 85721



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Fig. 1. Schematic representations of wetting front locations relative to zero-offset profiling (ZOP) borehole ground penetrating radar (BGPR) antennae and associated BGPR first arriving travel paths.

 


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Fig. 2. Breakthrough curves of BGPR first arrival travel time, pressure head, and water content from forward modeling. Note: Infiltration time on axis to be multiplied by 1 x 104 to obtain the correct time.

 


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Fig. 3. Infiltration into a layered soil. (A) Wetting front position as a function of time for three cases: a homogeneous soil; K1 < K2; and K1 > K2. (B) Associated BGPR first arrival travel time curves for the three cases shown in 3A.

 


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Fig. 4. Response surface from sensitivity analysis for {alpha} vs. n. The values used to form the synthetic data are log({alpha}) = –2 and n = 2. Contoured values are the logarithm of the root mean square error between the modeled and correct first arrival travel time profiles.

 


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Fig. 5. Retention curves from the estimated hydraulic properties presented in Table 1.

 





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