DARLING RIVERINE PLAINS BIOREGION Background Report
DARLING RIVERINE PLAINS BIOREGION Background Report
DARLING RIVERINE PLAINS BIOREGION Background Report
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16/08/02 Darling Riverine Plains Bioregion <strong>Background</strong> <strong>Report</strong><br />
2.2.2 Winds<br />
Wind has a strong influence on rainfall and the degree of erosion that occurs in the area.<br />
Nyngan is subjected to dominant southerly winds and subdominant north-easterlies in January<br />
with a modal speed of 11 to 20 km/hr. This changes to dominant southerlies of between six<br />
and 10 km/hr in winter. At Walgett, north-easterlies are dominant in summer with modal<br />
speeds of one to five km/hr, while in winter this changes to light southerlies and southwesterlies<br />
(Wolfgang 1998).<br />
Figure 2.10 below shows that the mean monthly wind speed at 9am at Walgett, Menindee,<br />
Bourke and Mungindi varies from 13.1 km/hr at Menindee to 7.1 km/hr at Mungindi in<br />
December and from 7.4 km/hr at Menindee to 3.5 km/hr at Mungindi in June. Wind speeds<br />
of the DRP are greatest, on average, in the spring months at all stations, and lowest in the<br />
winter months at all stations. Only the weather stations with long term data have been<br />
included in Figures 2.10 and 2.11 (Bureau of Meteorology 2001).<br />
km/hr<br />
14<br />
12<br />
10<br />
8<br />
6<br />
4<br />
2<br />
mean monthly 9am wind speed<br />
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec<br />
month<br />
Bourke Walgett Menindee Mungindi<br />
Figure 2.10 Mean monthly wind speed at 9am<br />
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