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| Home > Publications database > On the operating experience of the Doppler Sodar system at the Forschungszentrum Jülich |
| Book/Report | FZJ-2018-03234 |
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1990
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18725
Report No.: Juel-2355
Abstract: Meteorological measurement programs at nuclear installations arc necessary to cope-up with an unlikely event of- radioactive effluent release. Apart from the point of view of the emergency preparedness, at a nuclear facility, continuous meteorological measurements are needed to assess the impact of radioactive releases during normal operation. More realistic dispersion estimation models require meteorological inputs pertaining to the boundary layer which can not he completely fulfilled by a meteorological tower alone as the boundary layer height may extend up to 1000m. Also these models, when dealing with complex terrains, accommodate spatial variability in meteorological conditions (10). The Sound Detection And Ranging technique known as the SODAR technique to measure vertical temperature structure in the lower atmosphere became popular since around 1970. With the advancements in the fields of electronics and computers, the Sodar technique got developed and monostatic Doppler Sodars were built by many research and commercial organizations. Around the year 1985 many commercial establishments were offering Doppler Sodars to measure three dimensional wind components up to a height of about I000m. At the end of 1986 a REMTECH monostatic Doppler Sodar system was procured by the KFA and since then it has been in operation in the KFA environment. The system was extensively used at the foot of the hill 'Sophienhoehe' in connection with series of tracer dispersion experiments conducted at the hill site. At other times the system was operated in the KFA premises where a I20m high meteorological tower is in operation. Results of many specially performed tests (1,2,3,4,6,7,8,11,12) to study the usefulness and reliability of Doppler Sodars indicate that these are superior in many respects to several conventional measuring techniques though the Sodars are not yet accepted to be as basic as the conventional instruments. In this report the description and the operating principles of the Doppler Sodar at the KFA are briefly described and outputs from the routine operation of the Sodar are compared with the concurrently measured data on the 120m high KFA meteorological tower. Three sets of data, varying from periods of ten clays to 18 days, are used for the comparison.
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