Evaluation of a low-cost soil water content sensor

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Title:Main Title: Evaluation of a low-cost soil water content sensor
Description:Abstract: Wireless sensor networks are a promising newin situmeasurement technology for monitoring soil water content changes with a high spatial and temporal resolution for large areas. However, to realise sensor networks at the small basin scale (e.g. 500 sensors for an area of 25 ha), the costs for a single sensor have to be minimised. Furthermore, the sensor technique should be robust and operatewith a lowenergy consumption to achieve a long operation time of the network. This paper evaluates a low-cost soil water content sensor (ECH2O probemodel EC-5, Decagon Devices Inc., Pullman,WA) using laboratory aswell as field experiments. The field experiment features a comparison ofwater contentmeasurements of a forest soil at 5 cm depth using TDR and EC-5 sensors. The laboratory experiment is based on a standardized sensor characterisation methodology, which uses liquid standards with a known dielectric permittivity. The results of the laboratory experiment showed that the EC-5 sensor has good output voltage sensitivity below a permittivity of 40, but is less sensitive when permittivity is higher. The experiments also revealed a distinct dependence of the sensor reading on the applied supply voltage. Therefore, a functionwas obtained that allows the permittivity to be determined fromthe sensor reading and the supply voltage. Due to the higher frequency of the EC-5 sensor, conductivity effects were less pronounced compared to the older EC-20 sensor (also Decagon Devices Inc.). However, the EC-5 sensor reading was significantly influenced by temperature changes. The field experiment showed distinct differences between TDR and EC-5 measurements that could be explained to a large degree with the correction functions derived from the laboratory measurements. Remaining errors are possibly due to soil variability and discrepancies between measurement volume and installation depth. Overall, we conclude that the EC-5 sensor is suitable for wireless network applications. However, the results of this paper also suggest that temperature and electric conductivity effects on the sensor reading have to be compensated using appropriate correction functions.
Identifier:10.1016/j.jhydrol.2007.06.032 (DOI)
Responsible Party
Creators:Heye Bogena (Author), Johan A. Huisman (Author), Christoph Oberdörster (Author), Harry Vereecken (Author)
Publisher:Elsevier B.V
Publication Year:2013
Topic
TR32 Topic:Soil
Related Subproject:C1
Subjects:Keywords: Soil Water, Wireless Sensor, Content Sensor
File Details
Filename:2007_Bogena_JoH.pdf
Data Type:Text - Article
Size:11 Pages
File Size:583 KB
Date:Accepted: 15.06.2007
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:[TR32DB] Data policy agreement
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Journal of Hydrology
Source Website:www.elsevier.com/locate/jhydrol
Volume:344
Number of Pages:11 (32 - 42)
Metadata Details
Metadata Creator:Heye Bogena
Metadata Created:02.12.2013
Metadata Last Updated:02.12.2013
Subproject:C1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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