Sub-bottom Object Detection

An Update on the Main Innovations of the Past Years

By Huibert-Jan Lekkerkerk • December 11, 2020

While nautical charting mainly focuses on bathymetry and objects that form a hazard to shipping, offshore construction and dredging require sub-bottom information. There is nothing worse in any project than finding wrecks or unexploded ordnance (UXO) after construction has started. The detection of covered cables and pipelines is also an important survey objective. There have been some interesting innovations in this field over the past years and, while this article does not attempt to be exhaustive, it provides an overview of the various types of system available.

The Sub-bottom Profiler

The classic instrument for detecting bottom layers and sub-bottom objects is the sub-bottom profiler (SBP), or shallow seismic system. We distinguish the pinger, boomer and

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HOW EXTREME WEATHER CAN AFFECT SHIPS OVER THE WINTER MONTHS

 

 

 

https://www.safeguardinsurance.co.uk/

When operating a marine vessel in winter, there are always more risks due to the increased likelihood of severe weather and dramatic, often unpredictable, fluctuations in conditions throughout a journey. If travelling is a necessity, boat owners and marine businesses should take no chances as the consequences can be severe should something go amiss.

Navigating choppy waters

In December 2018, a Scotland-bound ferry was hit by severe weather conditions in the North Channel. This caused six lorries and other vehicles to topple against each other and overturn, causing significant damage and crushing cars in the impact.

Fortunately, none of the ferry’s 52 passengers and 56 crew suffered any injuries, however, some were confined to their vehicles during the incident

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Multibeam Sonar to Detect Subsea Leakage

 

 

 

https://www.hydro-international.com/case-study/

MBES technology has wide applicability in subsea leakage detection. The technology uses acoustics (sound signals) to build up maps of underwater space. This leaves the underwater environment undisturbed, which is particularly important in situations of hydrocarbon leakage. The Norbit Winghead, launched in mid-2020, is a unique curved-array ultra-high-resolution bathymetry sonar system utilizing the latest in analogue and digital signal processing.

The Norbit Winghead is versatile, easy to use and optimized for rapid mobilization on any platform. It offers a 0.5° x 0.9° beam width at 400kHz and a HD beamformer providing 1,024 beams per ping. The system’s low power consumption means that it can be battery operated. It provides a simple ethernet interface and signal processing capabilities, including roll stabilization, water column and backscatter

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ce Navigation in Canadian Waters

 

 

 

Ice Navigation in Canadian Waters 

is published by the Canadian Coast Guard in collaboration with Transport Canada Marine Safety, the Canadian Ice Service of Environment Canada and the Canadian Hydrographic Service of Fisheries and Oceans Canada. The publication is intended to assist ships operating in ice in all Canadian waters, including the Arctic. This document will provide Masters and watchkeeping crew of vessels transiting Canadian ice-covered waters with the necessary understanding of the regulations, shipping support services, hazards and navigation techniques in ice.

Chapter 1, Icebreaking and Shipping Support Services, pertains to operational considerations, such as communications and reporting requirements as well as ice advisories and icebreaker support within Canadian waters.

Chapter 2, Regulations and Guidelines provides a summary of information on regulations and guidelines for

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NOAA Formally Joins International Effort to Map Ocean Floor

 NOAA Administrator Rick Spinrad has signed a memorandum of understanding in conjunction with the United Nations Ocean Conference that formalizes U.S. participation in Seabed 2030. The memorandum also describes best practices and protocols for this type of data collection, which will help build positive collaboration between all involved countries and partners. As of 2022, 23.4% of the ocean is mapped, reflecting an increase of 10.1 million square kilometres (almost 3.9 million square miles) of new bathymetric data from 2021.

The new number represents contributions from a wide and diverse group of stakeholders, including various nations, government agencies, private companies, philanthropic partners and academic institutions.

NOAA and Seabed 2030: A Natural Fit In many locations, seabed mapping is done close to shore

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