Studies on Local Climatology (III)
1951 年 2 巻 2 号 p. 168-179
詳細
1951 年 2 巻 2 号 p. 168-179
The author and his collaboiators measured the bending directions of top-twigs of persimmon trees at about 230 points in the region of Akaho Fan, Nagano Prefecture, Japan, which covers an area of about 25 square kilometers.
They found that the bending of tree - tops was a very good indicator of the local prevaiding wind. The direction which they bend shows, with the inteival of confidence of about ± 15, ° the direction of the wind that prevails during the growing season of persimmon trees which is roughly from April to June.
Using the observed results, the author investigated the effects of the local topographical features and surface covers upon the prevailing wind of the locality.
Moreover, we made several a ctual and simultaneous wind observations at various places for some days when the southerly wind prevails at the surface of the fan. The precise local characteristics of the wind obtained till ough these observations agree surprisingly well with those estimated from the bending of the tree-tops.
