The Characteristic of Cross-Correlated Pressure Field in a Wedged Seafloor Environment

Abstract

The cross-correlated striation pattern of the complex pressure field has been proved to be a stable method for estimating the radial velocity of a moving source with a single sensor in the shallow water and in the deep ocean. In this paper, the characteristic of the cross-correlated striation pattern in a wedged seafloor waveguide is studied. Based on the wave equation we demonstrate that the cross-correlated vertical striations in the frequency-range plane are caused by the interaction of direct waves at two ranges. The interface reflected waves have significant effects on the cross-correlated striations in the real waveguide. The sediment properties in a wedged seafloor environment are closely related to the bottom reflection. Simulation results show that striations in the frequency-range plane are obscure under hard sediments conditions while they are clear with soft bottom. The striation pattern is closely connected to the interface reflections. Our study provides a reference for the environment of applying the cross-correlation method.