Navigating Through Land and Water

This year the Geodetic Institute of Slovenia is celebrating its 55th anniversary. As a public institution, the work of the Institute was and remains dedicated to geodesy, photogrammetry, cartography, geomatics and property. Its experts in different fields of the profession are also the lecturers at the University of Ljubljana and, in this way, they transfer their knowledge to younger generations. About 10 years ago, the Institute started hydrographic activities as official support to the Slovenian Hydrographic Office.<P> The Institute for Geodesy and Photogrammetry (IGF) was established on 14 December 1953 as a research institute at the University of Ljubljana. The... (read more)
2009-01-05 12:00:00

Cable Tracking in Shallow Water

Tailoring Systems for Inshore Operations
Whilst there has been an increased effort to resolve the issues of supporting deepwater construction operations, issues specific to shallow-water operations seem to have been largely overlooked, the attitude being that standard equipment packages would be perfectly adequate. What makes this all the more surprising is that the majority of offshore developments have some sort of shallow-water requirement associated with beach landing points. As always, the other factor driving all developments is cost. Whilst the high price of oil has produced a boom in oil-construction support, the laws of supply and demand have increased vessel and service provision rates to... (read more)
2007-05-31 12:00:00

Object Identification in Turbid Water

Near video-quality Images from Acoustic Systems
Working underwater requires visual feedback to prevent work slowing or even coming to a halt. Acoustic systems make images in turbid water, but not always with the required detail provided by optical systems. This article reviews technology that provides near-optical-quality acoustic images, allowing work to continue in zero-visibility water. Problem Overview A significant amount of underwater work takes place in seas, rivers and coastal areas where visibility is minimal and optical systems generate blank screens. Conventional sonar provides images under these conditions, but the detail generally does not come close to the optical detail needed for identification, inspection and manipulation... (read more)
2008-01-01 01:00:00

ROV Mid-water Station Keeping

An affordable and functional solution for Mid-water Station Keeping (MWSK) has been on the wish list of most ROV operators and manufacturers for some time now; the huge benefits in terms of operational efficiency and the future potential for pre-planned automated missions has made it a case of when, not if.      Against this backdrop and at the request of C-Innovation,CDL and Schilling Robotics engineers started work on a collaborative solutionover twelve months ago, the results of that effort were demonstrated in Marchin the Gulf of Mexico following an extensive period of Factory Acceptance Tests.   Traditional ROV station... (read more)
2011-04-05 02:41:22

Helping Make Blue Water Green

From December 2008 through October 2010, Arjen van Eijk and Florian Dirkse of the Netherlands will set sail on an adventure and produce a documentary targeted at raising awareness about the critical role oceans play in our world's climate. To ensure these two sailors will safely complete their "Care for the Ocean" mission, Hemisphere GPS and its partners Saderet and Nautikaris have donated navigation equipment.     With Hemisphere GPS' VS100 Compass aboard, Florian and Arjen will be able to precisely guide their 10m sailboat from the Galapagos Islands to the Suez Canal, while covering more than 47,000 kilometres of... (read more)
2009-02-26 10:47:14

Deep-water Black-box Retrieval

A Game of Hunt-the-pinger Against the Clock
Restricted operating life, limited range and bearing ambiguity in deep water are the known limitations of current locator beacons mounted on aircraft. These problems raise important questions: what is the best method of locating existing pingers and what can replace them? In deep water, pinger detection equipment could be installed on a submarine. Alternatively, a transponder beacon can provide both range and bearing information, as well as demonstrate a significantly longer listening life. Although heavier and therefore not suitable for light aircraft, commercial aircraft could easily accommodate such beacons allowing easier retrieval of the aircraft black boxes. In the July/August... (read more)
2009-12-04 03:49:14

World Water Depth Drill Record

The new world water depth drilling record set by Transocean drillship Discoverer Deep Seas was accomplished using a Sonardyne dual redundant subsea acoustic positioning system. The record was set last November when the vessel spudded a well in 10,011 feet (3,051 metres) of water in the Gulf of Mexico. The Discoverer Deep Seas has been equipped with a dual Sonardyne Long and Ultra-Short BaseLine (LUSBL) system since December 2002 and uses it as a highly accurate position reference for its DP system. The system is particularly suited to deepwater applications as it combines the performance derived from Long BaseLine (LBL)... (read more)
2004-03-03 12:00:00

ROV-triggered Water Sampling System

OSIL have supplied a water sampling system of for use in the offshore oil industry. Iindustry-standard Niskin bottles are included due to their robustness. OSIL designed a sampling system to secure 6 primed 5L Niskin bottles, with space for an AML Oceanographic CTD Plus V2 in the centre of a stainless steel frame, which could then be mounted to the ROV.   The system was required to retrieve multiple samples, with space for a CTD probe (or similar instrument to collect background data), and had to be fitted to and operated by ROV under difficult conditions. The samples were to... (read more)
2011-10-28 12:00:00

Shallow-water Survey in Canada

The St. Lawrence River channel operations
Canada is the second largest country in the world, with a shoreline measuring approximately 243,800km, more than six times the circumference of the Earth. The Canadian Hydrographic Service (CHS), established in 1883, is divided into four regions better to serve this immense territory. Shallow-water surveys take place in all four regions; however, one of these has the most intense operations: the St. Lawrence channel in the Qu├ębec Region. The Canadian Hydrographic Service based at Maurice Lamontagne Institute, in collaboration with the Canadian Coast Guard, is working to improve the efficiency and accuracy of these shallow-water survey operations. This paper presents... (read more)
2008-01-01 01:00:00

Multibeam Echosounder for Medium to Deep Water

The RESON SeaBat 7160 multibeam echosounder has been developed for marine exploration, seafloor habitat mapping and hydrographic charting in medium to deep water (3 to 3,000m). Equipped with X-Range, it provides improved system immunity to external noise. The system can operate in water depths of between 3 to 3,000 metres, offering up to 512 high-density equidistant beams with a selection of coverage modes including features such as variable and steerable swath, together with real-time pitch and roll stabilisation maximising useable swath and performance. The SeaBat 7160 also provides the collection of high-density water-column data all wrapped up in a processing... (read more)
2013-01-18 10:17:57
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