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風力等級是如何劃分的

時間:2011/11/21閱讀:1120
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    風力是指風吹到物體上所表現(xiàn)出的力量的大小。一般根據風吹到地面或水面的物體上所產生的各種現(xiàn)象,把風力的大小分為13個等級,zui小是0級,zui大為12級。陸地上出現(xiàn)的風力一般多在0-9級之間,10-12級的風陸上很少見,有則拔樹、摧毀建筑物,破壞力極大。為便于記憶,其口訣: 0級靜風,風平浪靜,煙往上沖。 1級軟風,煙示方向,斜指天空。 2級輕風,人有感覺,樹葉微動。 3級微風,樹葉搖動,旗展風中。 4級和風,灰塵四起,紙片風送。 5級清風,塘水起波,小樹搖動。 6級強風,舉傘困難,電線嗡嗡。 7級疾風,迎風難行,大樹鞠躬。 8級大風,折斷樹枝,江湖浪猛。 9級烈風,屋頂受損,吹毀煙囪。 此外,根據需要還可以將風力換算成所對應的風速,也就是單位時間內空氣流動的距離,用米/秒表示,其換算口訣供參考:二是二來一是一,三級三上加個一。四到九級不難算,級數減二乘個三。十到十二不多見,牢記十級就好辦。十級風速二十七,每加四來多一級。 即:一級風的風速等于1米/秒,二級風的風速等于2米/秒。三級風的風級上加1,其風速等于4米/秒。四到九級在級數上減去2再乘3,就得到相應級別的風速。十至十二級的風速算法是一樣的,十級風速是27米/秒,在此基礎上加4得十一級風速31米/秒,再加4得十二級風速35米/秒。 也可以參考以下:風級和 符號 名稱 風速(米)* 陸地物象 海面波浪 浪高(米) 0 無風 0.0-0.2 煙直上 平靜 0.0 1 軟風 0.3-1.5 煙示風向 微波峰無 飛沫 0.1 2 輕風 1.6-3.3 感覺有風 小波峰未破碎 0.2 3 微風 3.4-5.4 旌旗展開 小波峰頂破裂 0.6 4 和風 5.5-7.9 吹起塵土 小浪白沫波峰 1.0 5 勁風 8.0-10.7 小樹搖擺 中浪折沫峰群 2.0 6 強風 10.8-13.8 電線有聲 大浪到個飛沫 3.0 7 疾風 13.9-17.1 步行困難 破峰白沫成條 4.0 8 大風 17.2-20.7 折毀樹枝 浪長高有浪花 5.5 9 烈風 20.8-24.4 小損房屋 浪峰倒卷 7.0 10 狂風 24.5-28.4 拔起樹木 海浪翻滾咆哮 9.0 11 暴風 28.5-32.6 損毀普遍 波峰全呈飛沫 11.5 12 颶風 32.7- 摧毀巨大 海浪滔天 14.0

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