Bed conduction impact on fiber optic distributed temperature sensing water temperature measurements
Error in distributed temperature sensing (DTS) water temperature measurements may be introduced by contact of the fiber optic cable sensor with bed materials (e.g., seafloor, lakebed, streambed). Heat conduction from the bed materials can affect cable temperature and the resulting DTS measurements....
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-02-01
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| Series: | Geoscientific Instrumentation, Methods and Data Systems |
| Online Access: | http://www.geosci-instrum-method-data-syst.net/4/19/2015/gi-4-19-2015.pdf |
| Summary: | Error in distributed temperature sensing (DTS) water temperature measurements
may be introduced by contact of the fiber optic cable sensor with bed
materials (e.g., seafloor, lakebed, streambed). Heat conduction from the bed
materials can affect cable temperature and the resulting DTS measurements.
In the Middle Fork John Day River, apparent water temperature measurements
were influenced by cable sensor contact with aquatic vegetation and fine
sediment bed materials. Affected cable segments measured a diurnal
temperature range reduced by 10% and lagged by 20–40 min relative to
that of ambient stream temperature. The diurnal temperature range deeper
within the vegetation–sediment bed material was reduced 70% and lagged
240 min relative to ambient stream temperature. These site-specific
results illustrate the potential magnitude of bed-conduction impacts with
buried DTS measurements. Researchers who deploy DTS for water temperature
monitoring should understand the importance of the environment into which
the cable is placed on the range and phase of temperature measurements. |
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| ISSN: | 2193-0856 2193-0864 |