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Measurement and Modeling of Temporal Variations in Hydrocarbon Vapor Behavior in a Layered Soil Profile

CSIRO Land and Water, Private Bag 5, Wembley, W.A., 6913, Australia

View larger version (24K): [in a new window]   Fig. 1. Layout of sampling and monitoring installations.

View larger version (33K): [in a new window]   Fig. 2. Depth profiles of (left) soil volumes and (middle) NAPL contents determined from soil cores, and (right) soil gas measurements determined from VMP2 and VMP3 in April 1999.

View larger version (30K): [in a new window]   Fig. 3. Depth profiles of (left) soil volumes and (middle) NAPL contents determined from soil cores taken on 30 Nov. 1999, and (right) soil gas measurements determined from VMP2 and VMP3 on 1 Dec. 1999.

View larger version (26K): [in a new window]   Fig. 4. BTEX, 1,3,5 trimethylbenzene, and TPH hydrocarbon vapor concentration depth profiles for December 1999. Note that for these scales, the toluene data effectively coincide with the TPH data.

View larger version (27K): [in a new window]   Fig. 5. Online monitoring of O2 and total VOCs at VMP12 from 24 Dec. 1999 to March 2000. A rainfall event occurred on 14 to 15 Jan. 2000.

View larger version (26K): [in a new window]   Fig. 6. Online monitoring of O2 and total VOCs at VMP16 from 24 Dec. 1999 to March 2000. A rainfall event occurred on 14 to 15 Jan. 2000.

View larger version (12K): [in a new window]   Fig. 7. Data for April 1999, evaluated using Eq. [4].

View larger version (38K): [in a new window]   Fig. 8. Observed soil porosity (n, dots), gas content (a, open squares) and water content (w, solid squares) for (a) April and (b) November 1999, together with the fitted Gaussian-sum functions.

View larger version (25K): [in a new window]   Fig. 9. Calculated effective diffusion coefficient and partitioning constant [R(z) = g(z) + w(z)/K] based on Gaussian fits to data in Fig. 8 and Eq. [7]. Note that Dfree is taken to be Dg, free in Eq. [7].

View larger version (36K): [in a new window]   Fig. 10. Oxygen steady-state profiles for April and December 1999, together with the fitted profiles from (a, b) the piecewise-constant D models of Eq. [12] and (c, d) variable D models of Eq. [13] and [14].

View larger version (32K): [in a new window]   Fig. 11. Observed steady O2 profiles for April and November 1999, together with the fitted profiles from variable D models incorporating distributed consumption.