| 王泽明,程广利,孟路稳,罗夏云.用τ-p变换提取水中声源激发的海底Scholte波[J].声学技术,2019,38(1):97~102 |
| 用τ-p变换提取水中声源激发的海底Scholte波 |
| Application of τ-p transformation to extraction of the seabed Scholte wave excited by underwater sound source |
| 投稿时间：2018-01-13 修订日期：2018-02-27 |
| DOI：10.16300/j.cnki.1000-3630.2019.01.016 |
| 中文关键词: 舰船地震波场 Scholte波提取 τ-p变换法 端点效应 假频效应 |
| 英文关键词: ship seismic field extraction of Scholte wave τ-p transformation method port effect false frequency effect |
| 基金项目:国家自然科学基金（41576105）资助项目 |
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| 中文摘要: |
| 水中声源激发的海底地震波场成分复杂，为了将Scholte波从地震波场中分离出来，基于τ-p变换法，先将波场从τ-x域变换至τ-p域，利用Scholte波与其他波在该域中的特性差异，提取Scholte波，然后将其反变换回τ-x域，从而获得Scholte波。针对τ-p变换过程中固有的假频效应和端点效应，理论分析了各自的产生机理，分别采用限制波慢度和添加时间窗等方法抑制这两种效应。基于高阶交错网格有限差分法，给出了水中脉冲声源激发出的地震波场，并分析了其波动成分及特性，利用上述方法提取地震波场中的Scholte波，仿真结果证明了该方法的有效性。 |
| 英文摘要: |
| Seismic wave field excited by underwater sound source is complex. In order to separate Scholte wave from seismic wave field, the original wave field is transformed from τ-x domain into τ-p domain by τ-p transformation, and based on the characteristics of Scholte wave, which are different from those of other waves in τ-p domain, the Scholte wave in τ-p domain is extracted and then inversely transformed back to τ-x domain to obtain the Scholte wave. Considering that the inherent false frequency effect and end port effect exist in τ-p transformation, their formation mechanisms are analyzed theoretically, and then these two effects are suppressed by limiting wave slowness and adding time window respectively. The seismic field excited by underwater pulse sound source is given based on the high order staggered grid finite difference method, and then its wave components and characteristics are analyzed. Scholte wave in seismic wave field is extracted by using the above-mentioned method and the simulation results demonstrate the effectiveness of this method. |
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