astronomical > 鸣沙
Contents
Names
  Names. In this Ningxia Zhongwei. Sui home. "Ling Zhi Yuan and county map state": "Ming Sa ... ... West pillow of the Yellow River, troops passing through the sand, with the road noise is quite different than sand, so No. 'Ming sand'." Sima Guang Song, "Frontier "Poetry:" Swordsmen goshawk team, General White Huya. divide our forces logic Yin water, Zong Qi Ming hunting sand. "Qing Wu Albert," free Ganzhou has moved home court heard Xiaolian Ningxia "Poetry:" Midnight restaurant Qiang Di, the soft red fur Ming Sha snow riding. "Yi Feng Wu Annotation cited" Yi Tong Zhi ":" Ming-Sand Ruins west of Zhongwei County in Ningxia government, while troops over the sound of sand. "
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Yamana
  Yamana. Gansu Dunhuang South today. What about 40 kilometers, 20 kilometers north to south. "Sha Zhi Yuan and county map state": "Mingsha, a God Sand Hill, in County South Qili. This sand their Shan whom, steep ridges and peaks crisis, over the rocks. Are all surrounded by sand ridge, back like a blade, one of the Ming Tang, with the decadent foot drop, through residential wind, Zhe Fu, such as the old. "" known historical Shii Appendix III Khotan ":" Mingsha miles south of Gua, winter and summer cloud hearted sound like thunder, cloud, "Yu Gong" quicksand too. "
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Rolling ring of sand in the underwater
  Rolling ring of sand under water. Song Fancheng big "tip-off ship Jiangjin County asleep subscribed" Poetry: "Bamboo Dream snow emergency room noise, felt to roll Ming sand bottom."
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No. 4
  鸣沙,就是会发出声响的沙子。鸣沙是世界上普遍存在的一种自然现象。美国的长岛、马萨诸塞湾、威尔斯河两岸,英国的诺森伯兰海岸;丹麦的波恩贺尔姆岛,波兰的科尔堡,还有蒙古戈壁滩,智利阿塔卡玛沙漠,沙特阿拉伯的一些沙滩和沙漠,都会发出奇特的声响。据说,世界上已经发现了100多种类似的沙滩和沙漠。
  鸣沙的声音
  鸣沙这种自然现象在世界上不仅分布广,而且沙子发出来声音也是多种多样的。比如说,在美国夏威夷群岛的高阿夷岛上的沙子,会发出一阵阵好像狗叫一样的声音,所以人们称它是“犬吠沙”。苏格兰爱格岛上的沙子,却能发出一种尖锐响亮的声音,就好像食指在拉紧的丝弦上弹了一下。从中国的鸣沙山上滚下来,那沙子就会像竺可桢描述的那样“发出轰隆的巨响,像打雷一样”。
  鸣沙发声的原理
  鸣沙发出声响,应该有三个条件:第一个条件是沙丘又高大又陡峭。第二个条件是背风向阳,背风坡沙面还必须是月牙形状的。第三个条件是沙丘底下一定要有水渗出,形成泉和潭,或者有大的干河槽。由于空气湿度、温度和风的速度经常在变化,不断影响着沙粒响声的频率和“共鸣箱”的结构,再加上策动力和沙子本身带有的频率的变化,鸣沙的响声也会经常变化。人们有时候在下雨天去看鸣沙,发现鸣沙不会发出声响,正是由于温度和湿度的改变,把鸣沙的“共鸣箱”结构破坏了。
  敦煌鸣沙
  甘肃省敦煌县城南6千米有一处鸣沙山。《太平御览》和《大正藏》这两部书里曾经记载过它,那时候叫“神沙山”、“沙角山”。鸣沙山东西大约40千米长,南北大约有20千米宽,高有数十米, 山峰陡峭。它的北麓就是特别著名的月牙泉。人们如果登上鸣沙山往下看,只见沙丘一个接着一个, 真是沙丘如林。人们如果 从山顶顺着沙子往下滑, 那沙子就会发出一阵阵的 声响,不绝于耳。据史书记载,天气晴朗的时候, 鸣沙山上就会有丝竹管弦的声音,好像在演奏音乐一样。所以,人们称它是“沙岭晴鸣”,是敦煌的一大景观。
Thesaurus
Mingsha Town
Mingsha Community, Mingshajuweihui