National;
Laboratory;
of;
Acoustics,;
Institute;
of;
Acoustics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100080,;
China;
National;
Laboratory;
of;
Acoustics,;
Institute;
of;
Acoustics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100080,;
China;
National;
Laboratory;
of;
Acoustics,;
Institute;
of;
Acoustics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100080,;
China;
National;
Laboratory;
of;
Acoustics,;
Institute;
of;
Acoustics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100080,;
China;
sound; propagation,; bottom; acoustic; property,; horizontal; variation.;