Samples of Mobile Phase
Doppler SODAR 24
Measured by NCAR (Boulder/US)
Drainage Flow from Narrow Valley
General
The mobile SODAR 24 was operated by NCAR within an experiment near Salt Lake City
which investigates diurnal variations in the local wind field within the vicinity of a
narrow valley formation. The SODAR data was used to validate windprofiler data of the
lowest hundreds of meter. The SODAR system was powered by an electric generator.
The samples show a striking variation for
inflow/outflow periods, the nocturnal reorganisation of the wind field occurs more rapidly
and takes less than a hour. Over one week this pattern develops nearly identically in time
and intensity.
Data Retrieval
Simultaneously instantaneous and averaged data were calculated by the SODAR. In
addition to the mean spectra derived data an off-line cluster algorithm was applied on the
instantaneous data for wind speed and wind direction derivation.
Main Operation Parameters
| Ave |
= |
900 |
Averaging Interval 900 s |
| Trans |
= |
1674 |
Acoustic Frequency 1674 Hz |
| Step |
= |
25 |
Height Steps 25 m |
| Hmin |
= |
37.5 |
Start of Sampling 37.5 m |
| Hmax |
= |
400 |
End of Sampling 400 m |
Shown Samples
A one week period and 3 consecutive days are shown in the following plots. Wind speed
and wind direction are shown as wind vectors on-line derived from mean spectra.
click image to expand in new window |
Plot with data for the week
|
click image to expand in new window |
Plot with data from Day 1
(8 m/s west wind) |
click image to expand in new window |
Plot with data from Day 2
(8 m/s west wind) |
click image to expand in new window |
Plot with data from Day 3
(8 m/s west wind) |
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E&OE |
