Environmental Engineering Reference
In-Depth Information
models. The fundamental issue is discussed in Gryning and Batchvarova (2005)
and with special emphasis in urban area in Gryning and Batchvarova (2009).
3. Measurements and Models
Meteorological measurements from the Falkenberg site of Richard Assmann
Observatorium near Lindenberg, Germany, has been used. The site is covered with
grass; it is equipped with a 98 m high meteorological tower as well as a 12 m
mast. Here measurements of wind speed at 98 and 10 m height are used.
The following model results are used here: Cosmo, MM5 run by two groups
and WRF. The main point of the study is to demonstrate the method. Results from
1 day only are shown, and therefore caution should be taken on conclusions
concerning the individual models.
In Figs. 1 an d 2 th e wind speed at 100 and 10 m are shown. The line shows the
model prediction. The full circles show the measurements and the error bars
represent the standard deviation of the measurements due to natural variability for
a given averaging time, in this case 30 min. It can be seen that the error bars are
larger at 100 m than 10 m height, because the error bars increases both as function
of height and wind speed.
10
10
GKSS Cosmo
GKSS MM5
8
8
6
6
4
4
2
2
0
0
0
6
12
18
24
0
6
12
18
24
Time (Hour)
Time (Hour)
10
10
UPM MM5
UPM WRF
8
8
6
6
4
4
2
2
0
0
0
6
12
18
24
0
6
12
18
24
Time (Hour)
Time (Hour)
Fig. 1. Wind speed at 100 m height, explanation is given in the text
 
Search WWH ::




Custom Search