浅地层剖面仪GeoChirpⅡ图像中风浪变形效应的校正方法初探  

A Preliminary Study on the Method for Correcting Windwave-induced Distortion Effect in Images of GeoChirp Ⅱ Subbottom Profiler

作　　者：刘秀娟[1] 高抒[1] 杨旸[1] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,江苏南京210093

出　　处：《海洋科学进展》2007年第2期160-167,共8页Advances in Marine Science

基　　金：国家自然科学基金重点项目--强潮海湾粉砂与海岸系统行为(402301010)

摘　　要：当海面风浪较大时,测量船的摇摆会引起浅地层剖面图像的畸变,因此有必要研究风浪对浅地层剖面图像的影响及图像中风浪效应的校正方法,其中的关键问题是区分风浪效应和真实的沙波等海底床面形态。本文利用浅地层剖面仪GeoChirpⅡ在长江口所获得的浅剖图像对校正方法进行了研究。在所研究的实例中,海底周期性起伏的地形不是沙波,而是风浪效应引起的,用带阻滤波的方法可有效消除浅剖图像中的风浪效应,从而恢复真实的海底地形和地层形态。When the windwaves at sea surface are high, the swing of research vessel will cause the distortion of subbottom profiler images, so it is necessary to study the effect of windwaves on subbottom profiler images and the method for correcting the windwave effects in the images, and the key problem is to distinguish between windwave effect and real seabed morphology such as sandwave. In this paper, the subbottom profiler images obtained by GeoChirpⅡ subbottom profiler in the Changjiang estuary area are used to study the correction method. In the study case, the undulated seabed image does not indicate the sandwayes but the image induced by the windwave effects. The bandstop filtration method can be used to effectively remove the windwave effects in the subbottom profiler images so that the real seabed morphology and stratigraphic pattern can be recovered.

关 键 词：GeoChirpⅡ浅地层剖面仪 风浪效应 床面形态 滤波方法 长江口 

分 类 号：P736[天文地球—海洋地质]