downslope windstorm on May 18th, 2009, as well as to determine the effectiveness of the windbreak nets that were
used by some orchard owners during that time. Also included in this study is an analysis of the characteristics of
the winds that took place in the region during the 30-year period from 1979 until 2009. The wind record for the
region during the period from 1979 until 2009 shows that Gangneung province suffered strong winds whose
maximum speeds exceed 25 m/s , three times in March, eight times in April, and eight times in May, and 70.8%
of the winds in March, April and May were westwinds, which happened on 2,018 days out of the total 2,850 days.
The extent of the grape leaf damage was nearly 100% for the orchards where no windbreak nets were used, as
opposed to only 20.7% for the orchards where windbreak nets had been installed. The average vine yield per 10 a
at harvest time was also higher for the latter with 1,864 kg, compared to 1,451 kg for the former that didn't have
any windbreak nets. In addition, the grapes produced from the orchards without windbreak nets had a cluster weight
of 294.7 g, a berry weight of 5.1 g, a sugar level of 14.7 ºBx, and an acid level of 0.8%, while those from the
orchards with windbreak nets had a cluster weight of 378.3 g, a berry weight of 7.2 g, a sugar level of 15.0 ºBx,
and an acid level of 0.4%. From the these results, we conclude that using winbreak nets greatly reduces the damage
which windstorms cause in the springtime to the grape leaves, improving both the yield and the quality of the
produce.
5-박영식(최종)3.pdf
