초음파를 이용한 퇴적물 연직프로파일 측정

Abstract

Acoustic impedance, the product of density and acoustic velocity of a material, can be used as a proxy for SSC, because it is proportional to the backscatter. The conventional low-frequency acoustic technique may not be appropriate to identify the high-resolution (~millimeters) vertical profiles of SSC near the sediment bottom, due to the inherent limitation in resolution. In this study, high-frequency (210■760 kHz) Chirp acoustic waves were employed to yield the high-resolution profiles of SSC. The primary aims were to evaluate a potential of acoustic systems for detecting the existence and features of a fluffy layer, and to address the signal implication on the interface between the subaqueous layers with different rheological characteristics.