HR: 1340h
AN: H13A-0967    [Abstracts]
TI: Applicability of Raman Spectra Distributed Temperature Sensing in Hydrologic Observatories
AU: * Hausner, M
EM: hausnerm@unr.edu
AF: Dept. of Geological Science and Engineering, University of Nevada, Reno, MS 175, Reno, NV 89557,
AU: Tyler, S W
EM: styler@unr.edu
AF: Dept. of Geological Science and Engineering, University of Nevada, Reno, MS 175, Reno, NV 89557,
AU: Selker, J
EM: seklerj@engr.orst.edu
AF: Dept. of Biological and Ecological Engineering, Oregon State University, Gilmore Hall, Corvalis, OR 97331,
AU: Torgersen, T
EM: thomas.torgersen@uconn.edu
AF: Dept. of Marine Sciences, University of Connecticut, 1080 Shennecosett Rd, Groton, CT 06340,
AU: Schladow, S G
EM: gschladow@ucdavis.edu
AF: Dept. of Civil and Environmental Engineering, Univ. of California-Davis, Shields Ave, Davis, CA 95616,
AU: Thodal, C
EM: cethodal@usgs.gov
AF: U.S. Geological Survey, 2730 N. Deer Run Road, Carson City, NV 89701,
AU: Menon, M
EM: mmenon@unr.edu
AF: Dept. of Geological Science and Engineering, University of Nevada, Reno, MS 175, Reno, NV 89557,
AB: The extension of Raman Spectra fiber optic distributed temperature sensing (DTS) to hydrologic and environmental applications is growing rapidly. These systems offer very high spatial (~1 m) and temporal (up to 0.1 Hz) resolution of temperature along fiber optic cables of up to 30 km. It is anticipate that DTS systems will become an integral part of many long term observatories as well as become standard for most watershed and groundwater studies. Data are presented both on the performance and applicability of several commercially available DTS systems and as well as a comparison of commercially available optical fiber appropriate for hydrologic applications. Comparative tests conducted for limnological studies in Lake Tahoe CA and in the H.J. Andrews Experimental Forest in Oregon show that the tested commercially available DTS systems perform very well for many hydrologic field applications, and that temperature resolution of as low as +/-0.05 oC are easily practical for cable runs of up to 1 km. Optical fiber cable comparisons indicate that capillary tube-sealed fiber will be needed for most deep (>50m) water installations, but that much lower cost fiber could be used for stream, soil and shallow lake monitoring. Key issues identified in these trials included the role of thermal loading on fiber optic connectors and lasers, the need for calibration sections to remove instrument drift.
DE: 1813 Eco-hydrology
DE: 1823 Frozen ground
DE: 1845 Limnology (0458, 4239, 4942)
DE: 1860 Streamflow
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: 2007 Fall Meeting