Page 342 - gas transport in porous media

Chapter 21: Gas Transport Issues in Landmine Detection
100
90 0.9 1 343
Precipitation (cm/day) 80 Saturation 0.7
0.8
70
0.6
60
0.5
50
0.4
40
30
20 0.3 Bottom of mine
0.2
Top of mine
10 0.1 Surface
0 0
50 51 52 53 54 55 56 57 58 59 60 50 51 52 53 54 55 56 57 58 59 60
Time (days) Time (days)
1200 70
1000 Solar 60 Surface
50
800
Radiation (W/m 2 ) 600 Long-Wave Temperature (˚C) 40 Bottom of mine
30
400
20
200
Top of mine
0 10
Ne t
–200 0
50 51 52 53 54 55 56 57 58 59 60 50 51 52 53 54 55 56 57 58 59 60
Time (days) Time (days)
0
10 10 0
DNT 10 –2 DNT
Total concentration (ug/cm 3 ) 10 –4 –6 –8 DNB TNT Solid-Phase concentration (ug/g-soil) 10 –4 –6 –8 DNB TNT
–2
10
10
10
10
10
10
–12
–12
10 –10 10 –10
10
50 51 52 53 54 55 56 57 58 59 60 50 51 52 53 54 55 56 57 58 59 60
Time (days) DNT 10 –5 –7 Time (days) DNT
Liquid-Phase concentration (ug/cm 3 -l) 10 –4 –6 –8 TNT Gas-Phase concentration(ug/cm 3 -g) 10 –11 –9 DNB TNT
0
10
–2
10
10
10
–13
10
10
DNB
–15
10
10
–10
10
–19
10
–12
10
53
55
54
52
51
50
Time (days)
Time (days) 56 57 58 59 60 10 –17 50 51 52 53 54 55 56 57 58 59 60
Figure 21.3. Diurnal variation of various surface parameters for the period 50–60 days