Layered Media Detection Method for Bathymetric Surveys

This technical report presents a novel method for mapping the navigable bottom under fluid mud conditions using the NORBIT i87S sonar system. The method employs layered media detection (LMD) to utilize ultra-wide frequency ranges from 80kHz to 400kHz, allowing for the simultaneous processing of high and low-frequency signals. This approach effectively discriminates between different layers of the seabed, addressing the challenges posed by suspended sediments in water bodies. The report details the operational principles of the LMD method, including its ability to penetrate various mud layers and generate high-resolution bathymetric maps. It outlines the implementation of this method in real-world surveys conducted in U.S. ports, demonstrating its capacity to provide accurate data on the navigable bottom, even in complex fluid mud environments. The findings validate the effectiveness of the LMD technology compared to traditional single-beam systems, highlighting its potential for enhancing dredging operations and navigational safety.