To study effects of a buried electricity transmission cable on bulk soil.
The study investigated an Alfisol (special soil of temperate humid regions) where two underground electric lines (1.2 m depth 50 Hz triple cables) were placed; while one of them was inactive, the other was fully operational.
The sampling was carried out 6 months after an experimental run of the operative (voltage 220 kV) power line. A total of 960 soil cores with an average distance of 1 m and an average gradient of 0.3 m were surveyed.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
continuous for 6 months
|
|
| Frequency | 50 Hz |
|---|---|
| Type | |
| Exposure duration | continuous for 6 months |
| Exposure source |
|
|---|---|
| Setup | triple cable(220/380 kV) 1.2 m under the surface |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 0.5 µT | minimum | measured | - | 0.5 - 42.5 µT in the underground |
| magnetic flux density | 42.5 µT | maximum | measured | - | - |
| magnetic flux density | 0.5 µT | minimum | measured | - | 0.5 - 15.5 µT at the surface |
| magnetic flux density | 15.5 µT | maximum | measured | - | - |
| cf. remarks | - | maximum | measured | - | U = 220 - 380 KV |
The data showed that in a bulk soil surrounding an underground operative electric line where the magnetic field intensity was in the order of µT, the microbiological activity, organic carbon, and total nitrogen, were lower than those found in a soil surrounding an inactive non-operative electric line where the magnetic field was negligible.
The findings indicate that due to the magnetic field a spatial shift in the soil living phase occured affecting the microbial activity and the associated soil parameters.
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