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Correction of Lightning Effects on Water Content Reflectometer Soil Moisture Data

Dep. of Civil Engineering, Geotechnical Group, Univ. of Texas at Austin, 1 University Station, C1792, Austin, TX 78712-0280

View larger version (20K): [in a new window]   Fig. 1. Water content reflectometer calibration curve for the Rocky Mountain Arsenal soils.

View larger version (29K): [in a new window]   Fig. 2. Layout for the monitoring program at the Rocky Mountain Arsenal: (A) plan view; (B) elevation view.

View larger version (26K): [in a new window]   Fig. 3. Uncorrected water content measurements (m) for duplicate probes indicating the effect of lightning strikes: (A) Probes A-1a and A-1b during a short time period; (B) Probes A-1a and A-1b during a long time period; and (C) Probes A-6a and A-6b.

View larger version (13K): [in a new window]   Fig. 4. Schematic representation of the effect of a lightning strike; tls is the time of the strike and Sls is the shift in the moisture content reading induced by the strike.

View larger version (10K): [in a new window]   Fig. 5. Conceptualization of the water content reflectometer system in the event of a lightning strike: (A) physical model; and (B) analogous model.

View larger version (9K): [in a new window]   Fig. 6. Response of the analogous model of the water content reflectometer system to a lightning strike at time tls.

View larger version (31K): [in a new window]   Fig. 7. Volumetric moisture content for Probes A-1a and A-1b: (A) differences between uncorrected and corrected values of duplicate probes (); and (B) corrected values (c).

View larger version (17K): [in a new window]   Fig. 8. Decay parameter correlations from duplicate probes: (A) correlation with corrected moisture content; and (B) correlation with the absolute value of the shift parameter.

View larger version (27K): [in a new window]   Fig. 9. Volumetric moisture content for Probes A-6a and A-6b: (A) differences between uncorrected and corrected values of duplicate probes (); and (B) corrected values (c).

View larger version (29K): [in a new window]   Fig. 10. Data obtained using Probe B-4: (A) uncorrected volumetric moisture content values (m); (B) isochronous moisture profiles before and after Lightning Strike 2; (B) isochronous moisture profiles before and after Strike 3; and (C) corrected volumetric moisture content values (c).

View larger version (23K): [in a new window]   Fig. 11. Comparison of cumulative midyear precipitation (1 January–1 June) and corrected moisture content values (c) for Probe A-6a.