Page 347 - gas transport in porous media

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1E+05
1E+04 4 Phelan
1E+03
1E+02 3
DNT total concentration (ng/g) 1E–01 Surface 2 Precipitation (cm/hr)
1E+01
1E+00
1E–02
1E–03
1E–04
1E–05
1E–06
1E–07
3 to 6 cm
1E–08 0 to 3 cm 1
Precip (cm/hr)
1E–09
1E–10 0
14-Jul 24-Jul 3-Aug 13-Aug 23-Aug 2-Sep 12-Sep 22-Sep
Date
1E+05 4
1E+04
1E+03 3
1E+02
DNT total concentration (ng/g) 1E+00 2 Precipitation (cm/hr)
1E+01
1E–01
1E–02
1E–03
1E–04
1E–05
1E–06
0 to 2.5 cm
1E–07
2.5 to 5.0 cm
Precip (cm/hr)
1E–08 Surface 1
1E–09
1E–10 0
9-Jun 19-Jun 29-Jun 9-Jul 19-Jul 29-Jul 8-Aug
Date
1E+05 4
1E+04
1E+03 3
DNT total concentration (ng/g) 1E+00 Surfa ce 2 Precipitation (cm/hr)
1E+02
1E+01
1E–01
1E–02
1E–03
1E–04
0 to 2.5 cm
1E–05
1E–06
Precip (cm/hr)
1E–07
1E–08 2.5 to 5.0 c m 1
1E–09
1E–10 0
5-Mar 15-Mar 25-Mar 4-Apr 14-Apr 24-Apr 4-May 14-May 24-May
Date
Figure 21.7. T2TNT simulation results (lines) and field-data samples (boxes) for PMA1A landmine,
DNT, in 1998 (top), 1999 (middle), and 2000 (bottom)
Overestimates of model values would be expected because field samples are obtained
adjacent to the landmine. The 1-D nature of the simulation also would contribute
to overestimates because mass transfer takes place only vertically, with no lateral
transport. The T2TNT simulation model does not include the effects of plants,