Advances in High-speed Underwater Remote Vehicles for Subsea Pipeline Inspection

The Benefits and Challenges of the Technological Revolution in the Pipeline Survey Industry
The pipeline survey industry has undergone a technological revolution in the past couple of years, and the consequential benefits and challenges are only just beginning to be fully realized. The cost efficiency of subsea operations has been one of the key focus areas of the offshore energy industry in recent years. This focus, combined with increased growth in the amount of subsea infrastructure now in-situ on the seafloor, has seen a rising need for innovative approaches to subsea asset inspection. These solutions need to be cost-efficient, maintain data quality, and be able to provide a platform that supports future technologies.... (read more)
2019-04-02 10:25:26

Mapping Diamondiferous Gravel

Using the Aquares Resistivity System on a Fluvial Diamond Concession
An Aquares resistivity survey was carried out in a river in sub-Saharan Africa to map the sub-bottom features of a diamond concession. Diamondiferous gravels were distinguished remotely from bedrock and other soft sediments by the Aquares Resistivity System (ARS), a sub-bottom acquisition and profiling tool. It was selected due to its cost-effective operation and ability to provide qualitative and quantitative results. The ARS utilises recently developed processing innovations, which enable data to be presented in vertical sections and horizontal slices. This facilitates accurate volume calculations and the development of isopach maps for distinguishable types of bedrock and sediments. Acoustic sub-bottomprofiling... (read more)
2009-06-04 12:00:00

'As it Was'

by the Old Hydrographer
Matthew Fontaine Maury is probably the best known of all hydrographers, and the most celebrated both in his homeland, the United States of America, and in Europe. He served for 18 years as Superintendent of the Depot of Charts and Instruments in Washington during which time he made his name with the publication of his Wind and Weather Charts and Sailing Directions, his bathymetric chart of the North Atlantic and his book ‘The Physical Geography of the Sea’. Two Huguenot families, who had fled from France after the Revocation of the Edict of Nantes in 1685, had come together in... (read more)
2008-01-01 01:00:00

Survey Vessel Acadia

By an Old Hydrographer
On July 5th 2003 the Maritime Museum of the Atlantic, the Canadian Hydrographic Service and former officers, staff and crew of the CSS Acadia, gathered in Halifax, Nova Scotia, to celebrate her 90th birthday. The Acadia was the pride of the Canadian Hydrographic Service fleet for many decades. Now, as the museum’s largest artefact, she draws considerable attention, respect and admiration from those who appreciate fine vessels. The Canadian Survey Ship (CSS) Acadia was designed and built for hydrographic surveys by Swan, Hunter and Wigham Richardson Ltd. at Newcastle-upon-Tyne, England. She arrived in Halifax, Nova Scotia, on July 8th 1913... (read more)
2008-01-01 01:00:00

Nautical Depth Survey System

The Port Authorities in China want to adopt as standard in ports and harbours the navigable water depth; many ports in China have a problem with silt, liquid mud, deposited by rivers. Liquid silt has the characteristic of prohibiting navigation if it reaches a certain density. In most ports, silt with a density of 1,250kg/ltr and more is not navigable. The depth at which this density is found is called the Nautical Depth. To determine the Nautical Depth, instruments are needed to measure the density of the mud and to determine this datum for safe navigation and for dredging purposes.... (read more)
2008-01-01 01:00:00

SeaRobotics Corporation

Small affordable USVs for hydrographic data gathering
SeaRobotics Corporation was formed in 1999 to commercialise technology developed by the US Navy’s Office of Naval Research (ONR). After working with Autonomous Underwater Vehicle (AUV) technology and developing numerous communication systems utilising ad hoc networking for the transportation community, SeaRobotics continued its quest to develop autonomous systems for the hydrographic and oceanographic survey community. Extensive experience developing AUVs, ROVs and oceanographic instruments has led to the development of a growing family of Autonomous and Unmanned Surface Vehicles (USVs) and other marine robotic products in Florida, USA. During the last few years, significant interest in autonomous and unmanned vehicles has... (read more)
2008-01-01 01:00:00

Marine SDI

Introducing Spatial Data Infrastructures
Global warming, climate change, rising sea levels and increased commercial exploitation of the seabed and sea space are important global indicators of a changing world environment. A crucial role is played by hydrographic and oceanographic spatial data in supporting response. Accurate and timely base reference information minimally comprises seabed topography and characterisation to which temporal information such as wave, tide and current can be referenced. In order to provide a complete picture, information held by HOs, National Mapping Agencies (NMAs), geologists, biologists and oceanographers can be brought together to provide solutions through enabling frameworks known as Spatial Data Infrastructures (SDIs).... (read more)
2007-07-13 12:00:00

A Casualty of War

A Long and Faithful Career
In 1899, a new ship was launched at the Crescent Shipyard in Elizabethport, New Jersey, USA. This vessel was a Coast and Geodetic Survey ship designed and constructed for rugged service in the far reaches of Alaska. Although 196 feet long, the ship appeared boxy, almost like a section had been cut out of its middle. Primarily a steam vessel, it was also brigantine rigged. When under sail, the ship carried 4,500 feet of canvas. Its new civilian commander was Frank Wally Perkins and its name was Pathfinder. The complement consisted of civilian C&GS officers and a crew of 65... (read more)
2014-05-02 02:18:44

Mapping the Future by Mapping the Past

How Maritime Archaeological Research is Training Tomorrow’s Marine Scientists
This article describes the internship programme that has been offered during six years while performing maritime archaeological projects in the Mediterranean. This collaborative effort between academia and industry provides affordable manpower, whilst interns have a chance to learn and experiment on significant discoveries as part of a closely-knit group. After their internship, motivated interns benefit from broad experiences and contract opportunities. This introduction to quasi-professional employment contrasts with typical commercial operations in terms of pressure and learning opportunities; an approach that translates into continued success for the organisation and the majority of summer interns being motivated to further their career in... (read more)
2013-07-12 02:10:49

Technology in Focus: Multi-beam Echosounders

New Technology, New Capabilities and New Markets
The evolution of multi-beam echo sounders (MBES) is leading to systems with enhanced capabilities in their traditional markets, but also provides features to allow the expansion of their use into new areas and applications. This short review highlights some of the features of the latest generation of systems. The attributes of an MBES system are traditionally described by technical specifications, such as operating frequency, pulse length, beamwidth, number of beams and coverage. These technical parameters define the nature of the system, but the fundamental characteristics of greatest interest. By Dave Mann, Gardline Geosurvey, UK. Just as technological advances mean there... (read more)
2013-03-26 02:25:34
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