Researchers Map Seafloor Near Pine Island Glacier

The Pine Island Glacier in Western Antarctica is not only one of the fastest-flowing ice streams in the Southern Hemisphere; over the past 11 years, four major icebergs have calved from its floating tongue. In February 2017, researchers on board the German research icebreaker 'Polarstern' successfully mapped an area of seafloor previously covered by shelf ice. A comparison of these new maps with satellite images of the ice stream reveals why the glacier suddenly retreated toward the coast: at important points, it had lost contact with the ground, as the experts report in 'The Cryosphere', an online journal of the European... (read more)
2018-06-26 10:18:48

AUV Sea Trials and Tribulations

36 months and 25,000 kilometres later- was it worth it?
In 1999, the oil companies BP, Amoco, and Shell jointly published a document detailing the industry requirement for a survey AUV (Autonomous Underwater Vehicle) that stated: "For industry to adopt these vehicles, survey AUVs must reduce costs or be at least comparable to conventional surveys". Taking this to heart, C & C Technologies financed the development of such a vehicle with only one condition: If it worked, industry would guarantee 100 days of AUV utilisation during the following two years. Likewise, if the development failed, industry would be under no obligation. BP agreed, so C & C placed an order... (read more)
2008-01-01 01:00:00

Improving Satellite-derived Bathymetry

Using Spatial Regression Algorithms
Bathymetry is traditionally acquired using singlebeam or multibeam echosounders. This method produces accurate depth measurements along transects but is constrained by operating cost and an inability to survey in very shallow waters. Airborne Lidar is able to produce accurate bathymetric information over clear waters at depths up to 70m, but can be costly and is limited by a relatively coarse bathymetric sampling interval. Experience in Irish waters has resulted in very poor seabed detection along the east coast and limited penetration on the west coast. An efficient and cost-effective alternative is satellite-derived bathymetry. Calculating Depths by Satellite Satellite Derived Bathymetry... (read more)
2016-12-20 01:33:10

21 Semi-finalist Teams Advancing in Shell Ocean Discovery XPRIZE

XPRIZE has announced the 21 teams representing 13 countries advancing in the USD7M Shell Ocean Discovery XPRIZE. This three-year global competition challenges teams to advance ocean technologies for rapid, unmanned and high-resolution ocean exploration and discovery. Their innovative approaches run the gamut: gliders and drones, underwater robotic swarms, autonomous underwater vehicles, robotics, artificial intelligence and massive computing platforms. From a 25-country field, a panel of independent expert judges chose the semi-finalist teams who will move forward into the first round of testing. Semi-finalist team leads hail from Canada, China, France, Germany, Ghana, India, Japan, New Zealand, Portugal, South Africa, Switzerland, the... (read more)
2017-02-16 04:50:14

We Visited for You

Oceanology International 2004
From 16-19 March, London’s new Exhibition Centre (ExCeL) was hosting the Oceanology International for the second time; offering ample, proficient and modern space in the Docklands, it saw a well organised show which attracted a record number of 7,000 participants, visitors and exhibitors. The conference committee was chaired by Prof Graham Shimmield (Director of the Scottish Association for Marine Science). He and his team did a great job in putting together a very interesting programme around the conference theme of ‘Strategies for Stewardship of our Oceans and Coastal Zone’. In his opening speech, MP Steven Timms, UK Minister for Energy,... (read more)
2008-01-01 01:00:00

Top 10 Most Read Articles in Hydro International 2016

We are revealing Hydro International’s ten most read articles in 2016! We did not tweak anything: this is what it is! So this list gives you an indication on what is hot in the hydrographics industry. Underwater communications, positioning and technical backgrounds of sensor technology appear to be the key topics in our field as of 2016. Let’s see what next year will bring! For now: enjoy looking back at the trends and developments of the past year, and get a good insight into the state of today's surveying profession. Technology in Focus: Underwater Electromagnetic Propagation Underwater wireless communications links... (read more)
2016-12-28 10:44:53

Synthetic Aperture Sonar Challenges

Synthetic aperture sonar (SAS) has been under active development for decades. The technique is particularly well suited for autonomous underwater vehicles, and it is expected that SAS will replace traditional side-scan sonars for many ‘high-end’ AUV applications in the years to come. Research systems have been used for more than 15 years and many R&D groups around the world have been able to present images that would not have been possible to produce using traditional sonars. However, in many cases, these impressive sonar images are the result of days of tuning and tweaking by experts. A lot of effort has... (read more)
2008-05-15 12:00:00

RTK River Bathymetry in Africa

From Syledis and Tide Gauge to RTK GPS Water-level Corrected Survey
This article describes the installation of a hardware and software system for bathymetric surveys in the maritime part of the Congo River. The ‘Regie des Voies Maritimes’ (RVM) is a Congolese public administration in charge of an operational navigation river lane in the Congo maritime reach. The Congo River has the second lar­gest flow in the world and is 4,700km long. RVM maintains the conditions for commercial navigation in the so-called ‘maritime area’, from the mouth to Matadi harbour, over a distance of 150km. The estuary is the only maritime border of the Democratic Republic of the Congo (DRC), with... (read more)
2007-11-27 12:00:00

Air France Flight AF 447

A Challenge for Search and Recovery Technology
Air France flight 447, a scheduled passenger service from Rio de Janeiro (Brazil) to Paris (France), went missing on 1 June 2009 over the Atlantic Ocean with 228 people onboard. The aircraft took off from Galeão International Airport at 22:03 (UTC) on 31 May 2009 with an expected flight time of 11 hours. Contact was lost 4 hours into the flight. No distress calls were made. The recovery of aircraft parts and the ‘black-box’ recorders will be crucial to the investigation team – these tasks will challenge equipment, techniques and the ingenuity of the teams at sea.   Flight Reporting... (read more)
2009-06-26 12:00:00

Definitive Global Map of Ocean Floor Doubles Data

The data available to produce the definitive map of the world’s ocean floor has more than doubled, just two years after the launch of an international effort to produce a complete map by the year 2030. Following the efforts of The Nippon Foundation-GEBCO Seabed 2030 Project, coverage of the world’s ocean floor has now increased from 6% to 15%. This is equivalent to around 32,000,000 square kilometres of bathymetric data, an area greater than the landmass of African. Heeding the call from Seabed 2030, the industry is now making significant contributions to the mission with around 570,000 square kilometres of... (read more)
2019-06-17 09:54:15
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