| Title |
The Empirical Formula for the Wind Speed Amplification Factor according to the Funnel Effect between Mountains |
| Authors |
류혜진(Ryu, Hye-Jin) ; 하영철(Ha, Young-Cheol) |
| DOI |
https://doi.org/10.5659/JAIK.2021.37.10.235 |
| Keywords |
Funnel Effect; Wind Speed; Wind Speed Amplification Factor; 2-Dimensional Mountain |
| Abstract |
Because of the high population density and topographical characteristics of the many mountainous regions in the Republic of Korea, the
buildings are constructed not only on flat land, but also on relatively flat terrain between slopes and mountains. The wind speed may
increase between these mountains owing to the convergence effect, which is called the funnel effect. Because the funnel effect between
mountains is difficult to assess quantitatively, it is evaluated by reproducing the mountain range in wind tunnel tests. In this study, the wind
speed amplification factor was calculated according to the gradient (0.3, 0.4 ,0.5, 0.6) of the mountain and the distance(1 to 5 times the
height of the mountain) between the mountains based on the idealized 2-dimensional mountain, and an empirical formula was derived. The
higher the gradient of the mountain and the smaller the distance, the greater wind speed amplification factor, and the maximum was about
1.12. An empirical formula to which this trend was applied was derived. Additional wind tunnel tests were conducted to verify the empirical
formula, and the test data and the data calculated by the empirical formula were compared. As a result, the error rate of the empirical
formula was about 2%. If the empirical formula is used in a case similar to the topography conducted in this study, it is expected that the
funnel effect can be predicted more quantitatively. |