Study of Environmental Materials Affecting Sound-Producing Property of Singing Sand

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  • NODA Masazi
    Kyoto Prefectural Institute of Public Health and Environment

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  • 鳴砂の発音特性に及ぼす環境物質の影響
  • ナキスナ ノ ハツオン トクセイ ニ オヨボス カンキョウ ブッシツ ノ エイキョウ

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Abstract

A sound analyzer for measuring and analyzing the quality of singing sand was fabricated in order to clarify the deterioration factors of the sound-producing property of singing sand on the beach. The fundamental frequency measured by this instrument is used as an index. A technique that objectively evaluates the sound-producing property of singing sand was established. Using this technique, various environmental materials that affect the sound-producing property of singing sand were clarified. The environmental materials were sand moisture, precipitated salts from seawater, water-insoluble materials in fine powder state, and heavy oil and surfactant from environmental pollutants. Generally, the sound-producing property of singing sand deteriorates in the presence of these environmental materials. However, it was proven that the sound-producing property of singing sand is improved by the existence of moisture, heavy oil and surfactant at ultratrace levels. In addition, when physical forces, like vibration was applied to the sand particles, the sound-producing property of singing sand deteriorated, and actually disappeared. It was also proven that sand particle size has no effector the sound-producing property of singing sand.

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