Exercise 5.13c Lateral Wind Data Missing
(refer to Section 5.6 of Maple for the Environmental Sciences)

Using 161454.dat, replace all the lateral (usually the v or y-values but, here perhaps, the u or x-values) of wind speed by zero.  Repeat the calculation.  This should show what would happen if one only made measurements in 2D, ignoring the lateral wind values.

All these data are from a 3D propeller set of Gil Anemometers, as set up for the Air Pollution Meteorology course by the technical staff of Murdoch University on the Murdoch Oval, the southwest corner of Murdoch University, on a slightly overcast but otherwise clear day with a south to southwest wind, in sea breese conditions.  These anemometers have a good cosine response and the x anemometer was aligned with the S-N direction (a positive wind being from the north), the y anemometer, with the W-E direction (a positive wind being from the east) and the z anemometer in the vertical (anupward being positive).

For the calculation the  the recalculation will first omit the v-components.  This should show what would happen if one only made measurements in 2D, ignoring the y-values; as might have been done with an X-wire hot wire anemometer.

 

Specifically, using 161454.dat, from 16Apr96 @ 14:54, replace all the lateral (in this case the u or x-values) of wind speed by zero.  Repeat the calculation.   Also repeat the calculation using the lower data of 161454.dat and the upper and lower data of 161526.dat, from 16Apr96 @ 15:26.

The data collection is complete in the file turb.m as lists upper and lower.   The special variant in this calculation is that there are no lateral winds; in this case, the lateral wind uvis taken to be zero to see the effect of ignorance of  the lateral winds.  Separately the file turb16Apr96.m was prepared by worksheet file 161526.mws, also as lists upper and lower.  All that is required is to 'slip' the data into the maple data handling scheme to carry over the analysis for the other levels and the later time.

A separate set of data collected as acquired with the Murdoch Turbulence Probe is used to see the effect of the lateral wind, the data reported by  Smith(1994) and Findlater et al (2004).  

 

Revision of Statistics

Effect of Ignorance of the lateral wind

Automated procedures

Ignorance effect with the lower wind

Comparison  Data, Another Data Set

Tables with comparisons

Murdoch Turbulence Probe

Rotated Diad