Off-the-shelf Surveying Beyond 200 Miles

A contractor’s flexible approach to Art. 76-related surveys
The unique opportunity now open to Coastal States to extend their maritime boundaries seawards has led to great interest in the particular marine geophysical and hydrographic survey techniques required to collect additional data in support of continental shelf extension. Criteria laid down in the United Nations Convention on the Law of the Sea (Art. 76, UNCLOS) emphasise each nation being able to "…establish the outer limits of the continental margin wherever the margin extends beyond 200 nautical miles…" (www.un.org/Depts/los/index.htm). We describe Gardline’s experience with specific reference to surveying the continental margin of the Republic of Namibia. The objectives associated with... (read more)
2008-01-01 01:00:00

Hydrography to Fill in the 'I' in ECDIS

Hydro International Interviews Michael Casey
Hydrographers need to step up and fill the I in ECDIS, says Michael Casey, vice president Geospatial Systems at IIC Technologies and prior to that director for Nautical Charting at the Canadian Hydrographic Service. Casey sees hydrography and hydrographers playing a big role in enabling the marine industry to ship goods all over world in a more energy efficient way. Hydro International talks to him about this importance of energy efficient shipping and the role of hydrography in this development, the Northern Route as alternative for saving costs, carbon fuel and the I for information in ECDIS, in which this... (read more)
2011-07-15 03:17:22

Depth of Cable Cover Gets New Look

New Technology Reduces Cost
Burying utility cables under the seabed in shallow water environments to ensure cable safety is accelerating because of green power generation initiatives and the relative ease of securing permits to lay cable in rivers or estuaries compared to onshore right-of-ways. In locations with shifting sands and bottom profiles, verification that the utility line remains covered is often required. A new remote sensing method has been developed to accomplish depth-of-cover utility surveys at greatly reduced cost. Maintaining underwater utility infrastructure varies with water depth. ROVs are generally used in deep water. In less than 50 metres, such as nearshore, estuaries, bays,... (read more)
2011-07-15 04:13:41

Satellite Observations to Retrieve Tidal Sea Level and Tidal Currents

Prediction of tides is important for many things, including safe navigation, coastal engineering and surveying. To determine tidal constituents, a sea level time series from a tide gauge can be used. Satellite altimeters are able to measure sea level differences. These measurements have been used to describe the large-scale tides in the open ocean. This article describes a technique for obtaining tidal information in coastal areas by combining satellite data with in situ measurements.<P> Tides are responsible for a large part of the movement of water in oceans and seas. The ability to predict tides is important not only for... (read more)
2008-04-02 12:00:00

We Get ENCs… and Now What?

A historic perspective of nautical charts production in Chile over recent years is given here. The experience of the Chilean Navy’s Hydrographic and Oceanographic Service may serve other Offices encountering similar problems and perspectives in facing the new challenges of modern hydrography. In 1994 SHOA celebrated its 120th anniversary and its Director defined as one of the main goals of the organisation the development of electronic charting capabilities (1). Since 1995, the transition from paper to electronic nautical charts production has followed the steps given below: 1995: A financial calendar was approved towards realising the first Chilean S-57 ENC. 1996:... (read more)
2008-01-01 01:00:00

Hydrographic Surveyors Key to Defining Mining Resources through Survey Work

Rodney Norman, Royal IHC, Project Coordinator Blue Nodules
On 1 February 2016 a European consortium launched a new Horizon 2020 project: Blue Nodules. This project addresses the challenge of creating a viable and sustainable value chain to retrieve polymetallic nodules from the ocean floor. It will develop and test new, highly automated and sustainable technologies for deep-sea mining that exert minimal pressure on the environment. The project presents economical potential but also involves various challenges from a technological, environmental and professional perspective. Find out more in this interview with Blue Nodules project coordinator Rodney Norman, director marine mining of Royal IHC. What is the significance of deep-sea mining for your... (read more)
2016-03-01 11:08:23

A Company with a Deeper Understanding

Hydro International Interviews John Ramsden, Managing Director of Sonardyne International Ltd
Sonardyne is an organisastion at the forefront of acoustic, inertial, sonar and optical subsea technology development. It takes vision, a sustained focus on research and development and strong leadership to get there. Hydro International interviews John Ramsden, managing director of Sonardyne, for an in-depth look at adapting to the diverse nature of subsea operations and where the company that is now 43 years young, is headed next. You have now served as MD for five years and been with the organisation for a total of 20 years, achieving growth in all of Sonardyne’s business divisions. What drives you? Being part... (read more)
2015-04-03 02:10:51

Deep Offshore Metrology Tool

Spool and jumper metrologies constitute a critical path in the subsea pipe installation process. They can often occupy large construction vessels ‘just’ for survey operations that may last more than a full day, requiring several types of sensors (long baseline, gyros, depth sensors, etc.), as well as highly qualified surveyors. Moreover, measurement error may lead to spool misfit that has a dramatic impact on the overall project schedule. A newly designed metrology system, which may be seen as an acoustic taut wire, has now reached maturity and has been extensively used in 2006/2007 for different spool and jumper metrology projects,... (read more)
2008-05-30 12:00:00

Developments and Trends in Multibeam Echo Sounders

The multibeam echo sounders available on the market are constantly evolving as technology advances and as sonar producers seek new ways of refining and utilising the products. In this article we will provide a snapshot of current products and trends from the dominant (high-end) sonar producers focused on survey-grade products. Trend #1 – Resolution The neverending trend of getting higher resolution sonar systems is battling the physics of acoustics. Over the past several years, the battle for best-in-class multibeam for medium water depth has been between the Teledyne RESON SeaBat 7125, the Kongsberg EM 2040/2040C and the R2Sonic Sonic 2024.... (read more)
2016-02-01 03:59:24

Geophysical Surveys in West Africa

Detailed marine geophysical surveys are considered a key element in the process of development and construction of new offshore ports and load-out facilities. Specifically, seismic data constitute an essential part as they can reveal many unknown factors. Due to the challenging environment in West Africa and the often very shallow water depths, it requires a flexible and versatile approach from a survey company. This article gives an overview of how this type of project is approached and some of the lessons we have learnt when performing marine geophysical surveys in shallow water in West Africa.<P> West Africa is rich inmineral... (read more)
2009-01-05 12:00:00
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