Ports of Jersey choose Navsight Apogee solution for MBES operations

Bathymetry is the study and measurement of the depth and shape of underwater terrain, primarily focused on mapping the seafloor and other submerged landscapes. It is the underwater equivalent of topography, providing detailed insights into the underwater features of oceans, seas, lakes, and rivers. Bathymetry plays a crucial role in various applications, including navigation, marine construction, resource exploration, and environmental studies.

Modern bathymetric techniques rely on sonar systems, such as single-beam and multibeam echo sounders, which use sound waves to measure water depth. These devices send sound pulses toward the seafloor and record the time it takes for the echoes to return, calculating depth based on the speed of sound in water. Multibeam echo sounders, in particular, allow for wide swaths of the seafloor to be mapped at once, providing highly detailed and accurate seafloor representations.

Bathymetric data is essential for creating nautical charts, which help guide vessels safely by identifying potential underwater hazards like submerged rocks, wrecks, and sandbanks. It also plays a vital role in scientific research, helping researchers understand underwater geological features, ocean currents, and marine ecosystems.

Multibeam Echo Sounding (MBES) is an advanced hydrographic surveying technique used to map the seafloor and underwater features with high precision.

Unlike traditional single-beam echo sounders that measure depth at a single point directly beneath the vessel, MBES utilizes an array of sonar beams to simultaneously capture depth measurements across a wide swath of the seafloor. This allows for detailed, high-resolution mapping of underwater terrain, including topography, geological features, and potential hazards.

MBES systems emit sound waves that travel through the water, bouncing off the seafloor and returning to the vessel. By analyzing the time it takes for the echoes to return, the system calculates the depth at multiple points, creating a comprehensive map of the underwater landscape.

This technology is essential for various applications, including navigation, marine construction, environmental monitoring, and resource exploration, providing critical data for safe maritime operations and sustainable management of marine resources.

Hydrographic surveying is the process of measuring and mapping physical features of bodies of water, including oceans, rivers, lakes, and coastal areas. It involves collecting data related to the depth, shape, and contours of the seafloor (seafloor mapping), as well as the location of submerged objects, navigational hazards, and other underwater features (e.g. water trenches).

Hydrographic surveying is crucial for various applications, including navigation safety, coastal management and coastal survey, construction, and environmental monitoring.

Hydrographic surveying involves several key components, starting with bathymetry, which measures water depth and seafloor topography using sonar systems like single-beam or multi-beam echo sounders that send sound pulses to the seafloor and measure the echo’s return time.

Accurate positioning is critical, achieved using Global Navigation Satellite Systems (GNSS) and Inertial Navigation Systems (INS) to link depth measurements to precise geographic coordinates.

Additionally, water column data, such as temperature, salinity, and currents, are measured, and geophysical data is collected to detect underwater objects, obstacles, or hazards using tools like side-scan sonar and magnetometers.