难得一见:英国河流发现直径3米完美圆形冰圈
文章来源: icebreaker 于
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英国此次发现的神秘冰圈
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英国此次发现的神秘冰圈
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俄罗斯曾经发现的冰圈
北京时间1月14日消息,据英国《每日邮报》报道,日前,有人在英国德文郡的冰面上发现了一个完美的圆形冰圈,堪称大自然鬼斧神工之作,这是英国境内首次发现这种奇特的自然现象。
上周,德文郡居民罗伊·杰弗里斯(Roy
Jefferies)外出溜狗时,在霍尼顿附近的奥特河冰面上发现了这个直径约为10英尺(约合3米)的圆形冰圈。之前,北极、斯堪的纳维亚半岛和加拿大的冰面上发现过这种圆形冰圈,但这却是完美冰圈奇观首次在英国上演。它们一般出现在河流的拐弯处,湍急的水流在此会产生一种称为“旋转剪切
”(rotational
shear)的力,使一大块冰与周围冰层分离,绕其旋转。冰盘旋转时,不断压迫周围的冰,慢慢形成一个完美的圆。
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加拿大曾发现的冰圈
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美国密歇根发现的神秘冰圈
据杰弗里斯回忆,他当时被眼前的一幕惊呆了,立即打电话给好友格雷厄姆·布里塞特,后者素来对这种奇怪现象兴趣浓厚。布里塞特到达现场后,同样对这个慢慢旋转的完美冰圈现象惊讶不已。冰圈距河岸大约6英尺,而就在岸边,一条溪流汇入湍急的奥特河。布里塞特说,这种冰圈“极为罕见”,他以前从未听说过英格兰出现过这种奇妙的自然现象。
布里塞特说:“罗伊打电话给我时,我简直不敢相信。”他立即拿起照相机,一口气跑到奥特河,捕捉到冰圈的照片。布里塞特说:“我在距岸边6英尺处看到了一个最为完美的圆,直径大约有10英尺,我发现,它每4分钟10秒转一圈。当时,气温只有零下几度,而过去一周这里的天气潮湿阴冷。”据布里塞特介绍,这种冰盘的直径通常有所不同,瑞典曾记录过直径超过600米的冰圈
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