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;