Song of the dunes as a self-synchronized instrument.
Song of the dunes as a self-synchronized instrument.
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沙丘之歌作为一种自同步乐器。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
B. Kabbachi
中科院分区：
文献类型：
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作者：
S. Douady;A. Manning;P. Hersen;H. Elbelrhiti;S. Protière;A. Daerr;B. Kabbachi
自从马可波罗以来，人们就知道一些沙丘有一种特殊的能力，可以发出一种频率明确的响亮声音，有时持续几分钟。这种持续声音的起源一直是个谜，部分原因是它在自然界中很罕见。人们已经认识到，这种声音不是由于沙丘周围的空气流动，而是由于雪崩的运动，也不是由于沙粒的声激励，而是由于它们的相对运动。通过对比世界各地的沙丘鸣声，并在实验室和野外进行对照实验，证明了声音的频率就是沙粒相对运动的频率。声音的产生是因为移动的颗粒同步运动。室内实验表明，声发射不需要沙丘。在两个实验中都找到了声发射的速度阈值，并提出了解释。
Since Marco Polo it has been known that some sand dunes have the peculiar ability to emit a loud sound with a well-defined frequency, sometimes for several minutes. The origin of this sustained sound has remained mysterious, partly because of its rarity in nature. It has been recognized that the sound is not due to the air flow around the dunes but to the motion of an avalanche, and not to an acoustic excitation of the grains but to their relative motion. By comparing singing dunes around the world and two controlled experiments, in the laboratory and the field, we prove that the frequency of the sound is the frequency of the relative motion of the sand grains. Sound is produced because moving grains synchronize their motions. The laboratory experiment shows that the dune is not needed for sound emission. A velocity threshold for sound emission is found in both experiments, and an interpretation is proposed.