Difference between revisions of "Soil moisture/Electric Conductivity - FDR (WET Sensor)"
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− | [[Image: Wetsensor.gif |right| | + | [[Image: Wetsensor.gif |right|100px|]] |
==Parameter to be measured:== | ==Parameter to be measured:== | ||
Soil moisture, permittivity | Soil moisture, permittivity |
Revision as of 10:45, 9 June 2011
Parameter to be measured:
Soil moisture, permittivity Indirect measurement of electric conductivity of pore water Temperature
Method:
Frequency Domain Sensor
Equipment:
- Delta-T Device: WET Sensor with 3 rods of 600 mm length, HH2 display for manual reading or a data logger
Advantages:
- easy and fast measurement of punctual soil moisture and electric conductivity of soil pore water
- manual as well as continuously logged measurements possible
Disadvantages:
- Each sensor has to be calibrated
- careful application of probe in stony soils
- Underestimating of permitivity in media with low permitivity (ε > 40, clay and organic soils)
- unaccurate values in saturated media
What to watch out for:
- Good contact between probe and medium has to be proved
Problems/Questions:
Links
Other related web sites:
References
Hamed, Y.,Samy, G., Persson, M. (2006), Evaluation of the WET sensor compared to time domain reflectometry, HYDROLOG SCI J 51(4),671-681.
Regalado, C.M., Ritter, A., Rodriguez-Gonzalez, R.M. (2007), Performance of the commercial WET capacitance sensor as compared with time domain reflectometry in volcanic soils, VADOSE ZONE J 6(3), 1539-1663.
Bouskila, F.,Persson, M., Berndtsson, R., Bahri, A. (2008), Soil water content and salinity determination using different dielectric methods in saline gypsiferous soil, HYDROLOG SCI J 53(1), 253-265.