Improving Overall Resolution of Bathymetric Survey

Integrated Use of Multi-beam Echo Sounder and Towed Interferometric Sonar
Designing offshore engineering facilities requires large amounts of information. To acquire it, suites of engineering and geophysical surveys are run, which as a rule include such techniques of seabed and sub-bottom investigation as seismic profiling, acoustic, magnetic and bathymetric surveys. Obtaining accurate and detailed seabed bathymetry is extremely important because the quality of other surveys depends on the quality of the bathymetry. One of the most accurate and cost-effective ways to acquire high-resolution bathymetric data is the use of shipborne bathymetric systems such as multi-beam echo sounders (MBES) or interferometers. The drawback of this method is that the resolution of... (read more)
2012-04-19 03:50:13

The Advancing Technology of AUVs

A View of the Autonomous Underwater Vehicle Market
Since the last autonomous underwater vehicle (AUV) review in 2016, the market has continued to grow. The biggest market for AUV systems remains the military. The world’s most advanced Navies own and operate low-logistic AUV systems for mine countermeasures (MCM) in very shallow waters. These systems can operate in confined areas where MCM vessels cannot. The same systems can also be used in search and recovery operations, hydrography and salvage. This market used to be dominated by a handful of AUV providers. However, the number of manufacturers is increasing. Defence primes are also investing in these technologies through internal development... (read more)
2018-12-04 09:23:07

3D Sonar in Object Detection

Intuitive real-time imaging for sub-sea visualisation and classification
Sonar is well accepted as an option for detection and visualisation of underwater objects. Side-scan and sector-scanning sonar have traditionally been used by surveyors but whilst they produce excellent images, these are often difficult to interpret accurately. This article describes new developments in 3D-sonar and their advantages and use in emerging underwater disciplines. Classic applications for object-detection are many and varied, ranging from looking for items such as wreckage, debris, lost items and so forth to defence applications, seeking out threats such as mines. Increasingly, though, object detection has been expanded to include obstacle avoidance for both surface and submersible... (read more)
2008-01-01 01:00:00

Communications to the Deepest Point on Earth

Underwater Communication Solution for James Cameron’s Deepsea Challenge
In March 2012, filmmaker and explorer James Cameron successfully completed his one-man dive to the bottom of the Mariana Trench. The dive was the centrepiece of the Deepsea Challenge expedition, a joint scientific project by Cameron, the National Geographic Society and Rolex to conduct deep ocean research and exploration. A range of technological innovations were required for the venture, one of which was a reliable method for sending voice and data between the 'Deepsea Challenger' submarine and its support vessels on the surface. At a depth of almost 11km, the Mariana Trench is the most remote and isolated place on... (read more)
2013-03-26 01:37:16

Understanding the Unthinkable

The Titanic Disaster and Its Aftermath
In the night of 14 April 1912, the unthinkable happened. The mightiest ship afloat, the brand new White Star Line ship Titanic, was on its maiden voyage from Southampton, England, to New York. The ship was advertised as unsinkable. And, if unsinkable, why should there be adequate life boats for all the passengers and crew? The ship departed from Southampton on 10 April. Less than five days later it was at the bottom of the Atlantic Ocean. More than 1500 perished within three hours of striking an iceberg and ripping the bottom out of the ship. How this happened is... (read more)
2012-04-19 05:02:26

The Arctic Field Party

It seems ironic that in the early stages of the Cold War, the United States Government sent surveyors and hydrographic engineers to the coldest reaches of the North American continent. For these men, it was truly a Cold War. From 1945 through 1953, field parties of the United States Coast and Geodetic Survey were sent to survey sea routes through the Bering, Chukchi and Beaufort Seas as well as to conduct geodetic surveys to help position Distant Early Warning system radars and help delineate the vast resources of the Alaskan Arctic. These men toiled in obscurity beneath the midnight sun... (read more)
2017-07-04 11:00:42

From the National Societies

East Australia Region Commander (CMDR) John Maschke of the Royal Australian Navy (RAN) and chair of the East Australia Region of the Australasian Hydrographic Society was recently elected to the position of fellow within the Spatial Sciences Institute (SSI). John has had a long and varied career in the RAN, predominantly within the Australian Hydrographic Service. After receiving his education in Sydney, he briefly entered the Australian Public Service in 1973 before joining the RAN on 2nd April 1974. After completing Adult Recruit Training in 1974, John was employed as a survey recorder in the RAN Hydrographic Service until 1977,... (read more)
2007-10-27 12:00:00

Meet the Hydro International Team at Oceanology International (G-P)

In the third week of March, the entire marine world will be gathering in London, as this is where the biannual Oceanology International event is taking place. The exhibition and the conference bring together technological and scientific developments. With over 550 exhibitors and a state of the art conference programme OI12 is definitely the place to be. OI12 will be held from 13 to 15 March at the ExCel Exhibition and Conference Centre in Londonfs Docklands. The organisers are expecting at least 7,000 visitors to attend. Hydro international will of course be present. We not only have a stand (No.... (read more)
2012-03-08 10:02:38

The Impact of the Physical Properties of Water in Dam Lakes

In Accordance with the Results of the Echo Sounding and Reservoir Capacities
Technical managers and users of hydrographic surveying results of reservoir dams mainly pursue the amount of sedimentation and the authentic volume of the reservoir under their management. But to what extent is the data obtained reliable? It would appear that the following factors could be effective in gaining this objective: Technical, modern and updated hydrographic guidelines, Advanced equipment and their appropriate application,Timely calibration during equipping and the elimination of systematic errors,Qualified, experienced, trained and specialised manpower, The application of methodology, according to the hydrographic guidelines of the reservoir,Correct data processing, including the enforcement of the essential amendments and the rendering of the... (read more)
2010-09-13 02:06:26

Shallow Survey 2003

Interview with Dr Phil Chapple, Scientist, Conference Convenor, Australia
After completing a Bachelor of Science with Honours in Physics in 1983, Dr Phil Chapple worked in a laboratory of the Australian Defence Science & Technology Organisation (DSTO) where lasers were being developed for Australia’s Laser Airborne Depth Sounder (LADS). He returned to university to study for a PhD in Physics (laser spectroscopy), returned again to DSTO to investigate laser-material interactions and later worked some years on statistical image processing techniques. He completed the degree of Master of Mathematical Sciences (Signal & Information Processing), meanwhile learning details of sonar signal processing. In 1999 he moved to the DSTO Maritime Operations... (read more)
2008-01-01 01:00:00
Search Filter