title: Distinct effects of moisture and air contents on acoustic properties of sandy soil.
abstract: Knowledge of distinct effects of moisture content and air volume on acoustic properties of soil is sought to predict the influence of human activities such as cultivation on acoustic propagation outdoors. This work used an impedance tube with the two-thickness method to investigate such effects. For a constant moisture weight percentage, the magnitude of the characteristic impedance became smaller and the absorption coefficient became higher with increase of the air space ratio. For a constant air space ratio, the absorption coefficient became larger and the magnitude of the propagation constant became smaller with increasing moisture weight percentage.
authors.affiliation: Faculty of Engineering, Niigata University, 8050 Ikarashi-Ninocho, Nishi-ku, Niigata 950-2181, Japan oshima@eng.niigata-u.ac.jp.
authors.forename: Takuya
authors.initials: T
authors.lastname: Oshima
authors.affiliation: Department of Civil Engineering and Architecture, Tokuyama College of Technology, Gakuendai, Shunan, Yamaguchi 745-8585, Japan hiraguri@tokuyama.ac.jp.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hiraguri
authors.affiliation: Department of Architecture, Graduate School of Engineering, Kobe University, Kobe 657-0013, Japan okuzono@port.kobe-u.ac.jp.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Okuzono
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D000388:Air; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D010316:Particle Size; D012815:Signal Processing, Computer-Assisted; D012822:Silicon Dioxide / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D013016:Sound; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D012987:Soil; D014867:Water; D012822:Silicon Dioxide