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

The Search for Vasco da Gama’s Lost Ships

Esmeralda and São Pedro
Two Portuguese ships from Vasco da Gama’s second voyage to India, which were left behind in the Gulf of Aden to disrupt maritime trade through the Red Sea, were wrecked during a storm in 1503 off the coast of Al Hallaniyah Island, Oman. The remains of at least one of the ships were found in 1998, prompting a search for the second ship to be undertaken in 2013. The geophysical survey was complicated by environmental conditions, but it succeeded in locating all cultural heritage material in the bay. The Portuguese ships that were the target of this research, and the ensuing... (read more)
2017-03-22 10:53:49

Dredge Efficiency and Precise Positioning

Integrating Dredging and Hydrographic Techniques
Dredgers involved in mining for (precious) minerals and metals often work in an inland dredging pit. Dredgers float in a ‘wet environment’ where the surrounding water is used as transport medium. The fact that the minerals are mostly covered in various sediments is one of the biggest problems in mining them. This article describes some of the techniques used in these dredging operations and illustrates the importance of integrating techniques and information. Most minerals, like rutile and zirconia, are to be found on top of a layer of clay with the highest concentrations found closest to it. Pewter is mostly... (read more)
2008-01-01 01:00:00

Seismic Activity Data Collection on the Ocean Floor

Sponsored Article
Unlike neighbouring Japan, earthquake activity is infrequent in the peninsula area of South Korea, and those that do occur tend to be low in intensity. Typically, earthquakes in this region measure between 2.0 and 5.0 on the Richter scale[1]. The record for the quake with the highest magnitude on the Korean Peninsula stood for some time, recorded at 5.3 in 1980. This was recently overtaken by a 5.8 magnitude tremor in Gyeongju in 2016 and a 5.4 magnitude tremor in Pohang, followed soon after by a 4.8 magnitude aftershock tremor. Data on these events is collected using the existing seismological... (read more)
2019-08-06 08:30:32

Mapping the Deep Ocean with Multiple AUVs

Ocean Infinity’s Seabed Exploration Project
Ocean Infinity’s seabed mapping campaign commenced in the summer of 2017. The Ocean Infinity team is made up of individuals from multiple disciplines, who have gained vast experience with deep-sea exploration operations in the past. Their combined knowledge and insight led to the idea to undertake deep-sea mapping operations using up to eight autonomous underwater vehicles (AUVs), paired with eight unmanned surface vessels (USVs). This novel concept is explained in more detail in this article. Human inquisition drives us to explore. This has led man to delve below the surface of the oceans. Our ability to understand the undersea world... (read more)
2018-04-24 09:22:31

Metocean Automatic Monitoring Stations in Malaysian Waters

Marine meteorological and oceanographic (metocean) data is required at all levels (e.g. planning and operations) of the Meteorological Department, the Naval Department, Ports or Harbours and the Oil and Gas Industry. The Meteorological Department of Malaysia has recently embarked on a Coastal and Port Automatic Meteorological and Oceanographic station network to support weather forecasting. This paper details functions and requirements for the development of this system. Marine meteorological and oceanographic technology has advanced a long way since the early days, from recording measurements on paper chart rolls to using solid-state memory, from simple wave staffs to satellite-transmitting wave directional buoys,... (read more)
2008-01-01 01:00:00

The European Seafloor Observatory Network (ESONET)

ESONET proposes a network of sea floor observatories around the European Ocean Margin, from the Arctic Ocean to the Black Sea, for strategic long-term monitoring as part of the European GMES (Global Monitoring for Environment and Security). The network will have capabilities in geophysics, geotechnics, chemistry, biochemistry, oceanography, biology and fisheries. Long-term data collection and alarm capability in the event of hazards (e.g. earthquakes) will be considered. Ten initial areas for ESONET development have already been identified, in addition to a mobile emergency response station. The submarine terrain around Europe, from the continental shelves to 4,000 m depth, is known... (read more)
2008-01-01 01:00:00

Capturing Convection: Glider Validated Modelling

Can Underwater Gliders Be Used to Check Ocean Forecast Accuracy?
Recently, three unmanned underwater vehicles (UUVs) were deployed in the northwest Mediterranean Sea to monitor open-ocean convection via changes in the local density structure. Mixed-layer depth and thermocline response to buoyancy flux were extrapolated from in-situ profiles and used to infer the occurrence of deepwater formation events. The high-resolution data set acquired has been used to assess ocean forecast model performance in this area. The advantages of employing glider data sets in further validation schemes are discussed here. Forecast models are employed by the oceanographic agencies for meteorological and commercial shipping applications, as well as in naval sonar propagation studies,... (read more)
2010-07-12 04:21:48

Hydrographic Surveying in Greenland Waters

The Hydrographic Survey (Søopmålingen) which is a part of the Oceanographic division within the Royal Danish Administration of Navigation and Hydrography (RADON), conducts hydrographic surveying in the Danish and Greenland waters. This article will focus on operations in Greenland waters. Hydrographic surveying in Greenland can be dated back to 1605. Until the 19th century existing charts were made from data gathered by civilian as well as navy vessels. At the end of the 19th century the Danish Government started considering how Greenland could be charted in a more systematic way. The Charting of Greenland Waters A scientific expedition was commissioned... (read more)
2008-01-01 01:00:00

Trends and New Technology in the ROV Industry

New IMCA ROV Classifications and Applications Moving Towards Renewables
Over the past few years, the requirement for ROV support in the oil & gas sector has been hampered by the downturn in the sector. However, the continued investment in renewable energy has provided opportunities for manufacturers to continue their R&D projects to create the next generation of ROV systems. In view of this, the IMCA guidelines for the Safe and Efficient Operation of Remotely Operated Vehicles (IMCA R 004 Rev4) has been updated. The guidelines now include an expanded list of ROV classifications based upon the increased diversification of tasks performed by ROV systems around the globe. The revised... (read more)
2017-08-07 01:31:12
Search Filter