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

Hydro 2003

Interview with Maurice Perwick, Chairman of the Organising Committee, New Zealand
Although not fitting into the traditional biennial series of well-known HYDRO Conferences and Exhibitions, the year 2003 will nevertheless see a 'Hydro 2003' Hydrographic Conference and Exhibition. This time it is the New Zealand region of the Australasian Hydrographic Society which will organise the event in Christchurch, New Zealand from 24th Ð 26th November 2003, the fourth in the series of Australasian Hydro Symposia. Does the ‘down under’ region deserve more attention from the International Hydrographic Community? The Chairman of the organising committee of Hydro 2003, Maurice Perwick, agreed to be interviewed by Hydro international and provide more information on... (read more)
2008-01-01 01:00:00

Oceanology International to have Three Points of Focus

When Oi08 opens at the ExCeL centre in London’s Docklands on 11 March, the exhibition and its accompanying conference will focus on the three important issues that have begun to dominate thinking in ocean science and technology: climate change, meeting future energy demands, and ensuring environmental and civil security. These have become interconnected issues, with expertise now moving freely between each of these apparently specialised sectors.<P> With a 3-day conference accompan­ying this major exhibition, it is almost inevitable that public concerns about climate change will attract considerable interest. The role of the oceans in global warming is likely to take... (read more)
2008-03-12 12:00:00

Acoustic Technology in Historic Wreck Recovery

Remaining parts of the famous 16th century ship the Mary Rose have been recovered in Portsmouth Harbour entrance using standard offshore equipment. The use of acoustic navigation enabled both divers and ROV to work with more efficiency, precision and more conveniently. One of the more memorable broadcasts seen on British television in 1982 showed the lifting of the wreck of the Mary Rose, sunk outside Portsmouth Harbour in 1545. Although regularly monitored, the wreck site has remained largely untouched since then. In December 2002 the UK Ministry of Defence approached the Mary Rose Trust and relevant heritage agencies to inform... (read more)
2008-01-01 01:00:00

Trends in Hydrography

Taking Lessons from Today's Technical Developments
It’s often a cliché to say that everything offshore has changed since the introduction of GPS, but there have certainly been many changes since back then in the 1980s. The other obvious transformational technology has been computers and computer processing that, like the rest of the world, has totally and radically changed our lives. It didn’t happen immediately of course – no, that would never do in the ultra conservative environment of hydrography and offshore surveying. However, it’s clear when comparing mid-20th century surveying with today that they have totally and fundamentally impacted our projects. Nowadays, such technologies are often taken... (read more)
2016-12-06 02:02:15

3D Sonar Technology

The journey from oil and gas to homeland security and back again
Since its introduction many years ago, survey sonar has evolved steadily, but is still a difficult and non-intuitive survey tool, requiring large amounts of processing to arrive at the most basic end product. Initially, anyone wanting to survey or inspect the underwater environment was limited to single beam echo-sounders, in simple terms one-dimensional sonar, yielding very little quantifiable data. These in turn were developed into mechanically scanned sonars, and subsequently into today’s high performance multi-beam and forward looking sonars which are the back-bone of the survey industry. Even the very best commercially available multi-beam sonar delivers only 2 dimensional data... (read more)
2008-01-01 01:00:00

Satellite-derived Bathymetry

A Reconaissance Tool for Hydrography
A study was conducted to evaluate the use of a satellite-derived bathymetry (SDB) procedure to map shallow-water bathymetry in a GIS environment, and to identify areas that require a new hydrographic survey. Publically available, multispectral satellite imagery and published algorithms are used to derive estimates of the bathymetry. The study results indicate a potential use of the procedure by national hydrographic offices as a reconnaissance tool. In some developing countries, the information available to plan and prioritise hydrographic surveys is typically based on visual inspection of existing nautical charts. However, due to the age of many existing charts and lack... (read more)
2013-12-04 11:21:17

From Papyrus to Electronic Charts

Modernising Fluvial Charts in the Amazon Region of Peru
The Amazon is the world’s largest river system. With more than 50,000km of navigable waters, ocean-going vessels are able to transit almost 6,000km from its mouth in the Atlantic Ocean to Iquitos, Peru. The Amazon and its more than 1,000 tributary rivers are characterised by rapid changes in water levels and current flow causing constant erosion and sedimentation. The need to continually monitor the location of river banks and channels presents an enormous challenge to those responsible for providing necessary hydrographic services to ensure safe fluvial navigation throughout the vast region. The Amazon River basin is approximately 7,050,000km2 in total... (read more)
2011-12-19 03:45:40

Technology in Focus: Insides of Side-scan Sonar

Advancing Technology for a Wide Range of Purposes
Although today’s multibeam echo sounders come with a backscatter option the more traditional Side-scan Sonar (SSS) still has many advantages when it comes to bottom imaging. Over the past years, SSS technology has gone through an evolution rather than a revolution. In this article we will zoom in on the current state of the art of this useful acoustic imaging device. Side-scan Sonar is mainly used for the detection of objects and bottom structures. To obtain those images it digitises a sound pulse sent out from two transducers mounted on each side of the SSS fish. Images are based on... (read more)
2016-05-19 01:22:38

Specifying a Waterside Facility Protection System

The problem of protecting ports, harbours and waterside facilities has recently received a great deal of attention. Several systems have been deployed, but almost none of these efforts has been totally successful. Here, we discuss some of the factors that can make the difference between success and failure when specifying a port protection system and the importance of the hydrographic environment. There are two types of systems. A permanently installed system (Figure 1) for initial intrusion detection and tracking, and a mobile system for entry route surveys, follow up and interception. The permanent systems require detailed hydrographic surveys for selecting... (read more)
2009-02-11 12:00:00
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