Campbell Scientific HFP01SC Hukseflux Self-Calibrating Soil Heat Flux Plate - Manual (Page 28)

Model HFP01SC Self-Calibrating Soil Heat Flux Plate
5 shf_5 0 0 0
6 shf_6 0 0 0
7 shf_mV_1 1 5 2
8 shf_mV_2 1 0 1
9 shf_mV_3 1 0 1
10 shf_mV_4 1 0 1
11 shf_mV_5 1 0 1
12 shf_mV_6 1 0 1
13 cal_1 5 5 3
14 cal_2 9 0 1
15 cal_3 9 0 1
16 cal_4 9 0 1
17 cal_5 9 0 1
18 cal_6 9 0 1
19 mV_0_1 9 1 1
20 mV_0_2 1 0 0
21 mV_0_3 0 0 0
22 mV_0_4 0 0 0
23 mV_0_5 0 0 0
24 mV_0_6 0 0 0
25 mV_180_1 1 1 1
26 mV_180_2 0 0 0
27 mV_180_3 0 0 0
28 mV_180_4 0 0 0
29 mV_180_5 0 0 0
30 mV_180_6 0 0 0
31 mV_end_1 1 1 1
32 mV_end_2 0 0 0
33 mV_end_3 0 0 0
34 mV_end_4 0 0 0
35 mV_end_5 0 0 0
36 mV_end_6 0 0 0
37 V_Rf_1 5 2 1
38 V_Rf_2 9 0 1
39 V_Rf_3 9 0 1
40 V_Rf_4 9 0 1
41 V_Rf_5 9 0 1
42 V_Rf_6 17 0 1
43 work 1 4 4
44 shf_mV_1a 5 1 1
45 shf_mV_2a 9 0 1
46 shf_mV_3a 9 0 1
47 shf_mV_4a 9 0 1
48 shf_mV_5a 9 0 1
49 shf_mV_6a 17 0 1
6.4 Soil Heat Flux and Storage
The soil heat flux at the surface is calculated by adding the measured flux at a
fixed depth, d, to the energy stored in the layer above the heat flux plates. The
specific heat of the soil and the change in soil temperature, ∆T
s
, over the output
interval, t, are required to calculate the stored energy.
The heat capacity of the soil is calculated by adding the specific heat of the dry
soil to that of the soil water. The values used for specific heat of dry soil and
water are on a mass basis. The heat capacity of the moist is given by Equation
1 and Equation 2:
( )
C C C C C
s b d m w b d v w w
= + = + ρ θ ρ θ ρ (1)
22