Steve Ritchie - A Living Legend

Many of you will be familiar with our columnist Steve Ritchie, who has been writing his ‘As it Was’ columns with great enthusiasm from the very start of Hydro international magazine. It is his gripping style of writing that rivets us to his stories, making us experience hydrographic history as if it happened only yesterday. And as a Russian journalist wrote earlier this year: "If congress organisers hadn’t warned me that Steve Ritchie from England was born in 1914 I would never have called this mischievous Mr Pickwick a ‘patriarch’, even less an ‘elder’." It was this description of Steve... (read more)
2008-01-01 01:00:00

Innovator Measuring ‘Salt Fingers’

Interview with Albert J. Williams III, Woods Hole Oceanographic Institution, USA
Mr Albert J. Williams III was given the IEEE OES Distinguished Technical Achievement Award in 2000; a prestigious prize, as one of the earlier winners was Robert J. Urick. Mr Williams has spent many years at Woods Hole Oceanographic Institution doing research in oceanography and developing instruments for current and for shear measurements. He chairs the IEEE Current Measurement Technology Conference in March 2003 in San Diego. It thus seemed a good moment to ask Mr Williams about his career, developments of today and tomorrow in current measurement equipment, and the Current Measurement Technology Conference. Please give our readers a... (read more)
2008-01-01 01:00:00

The Siboga Expedition

Biological, Hydrographic and Oceanographic Accomplishments in the Late 19th Century
The Indonesian Archipelago is one of the world’s most beautiful archipelagoes. Home to over 17,000 islands, mountains rising to over 5,000 metres including over 70 historically active volcanoes, fabled spices, and a rich flora and fauna, Indonesia has beckoned fortune seekers and naturalists for centuries. The shores of its far-flung islands are bathed by two oceans and at least eleven separate seas making it also a challenging area for hydrographers. In the late 19th century, Indonesia was administered by the Dutch and known as the Dutch East Indies. The terrestrial flora and fauna of the area was fairly well known... (read more)
2011-01-27 03:57:53

The Search for Vasco da Gama’s Lost Ships

Esmeralda and São Pedro
Two Portuguese ships from Vasco da Gama’s second voyage to India, which were left behind in the Gulf of Aden to disrupt maritime trade through the Red Sea, were wrecked during a storm in 1503 off the coast of Al Hallaniyah Island, Oman. The remains of at least one of the ships were found in 1998, prompting a search for the second ship to be undertaken in 2013. The geophysical survey was complicated by environmental conditions, but it succeeded in locating all cultural heritage material in the bay. The Portuguese ships that were the target of this research, and the ensuing... (read more)
2017-03-22 10:53:49

Lines in the Sea

Maritime Boundary Delimitation
Under the 1982 United Nations Convention on the Law of the Sea (UNCLOS) coastal states may claim rights over the resources of the sea and seabed up to 200 nautical miles (M) from their coasts, and seabed jurisdiction out to 350M where the continental margin is wider than 200M. But many boundaries are ill defined and even disputed. With the oil and gas industry operating in ever-deeper waters, the need for geodetically precise maritime boundaries has become increasingly pressing. This article explores the challenges involved. More than 30% of the world’s oceans now fall under state jurisdiction, with overlapping maritime... (read more)
2007-04-04 12:00:00

LIDAR Bathymetry in Norwegian Waters

The Norwegian Hydrographic Service (NHS) has and will be utilising airborne LIDAR bathymetry in connection with the ongoing effort to modernise the maritime infrastructure along the Norwegian coast. This article describes the benefits and limitations of the technology, the results of a pilot project conducted in Norwegian waters in 1998 and operational data collection in Norway in 2002. The long-term plan for the Norwegian Hydrographic Service (NHS) is by 2006 to have the Norwegian coast covered with ENCs and paper charts based on source data from modern surveys. The Enhanced ENC Project was established in 1999 and is responsible for... (read more)
2008-01-01 01:00:00

Autonomous Drifting Echo-sounding Buoys

Drifting echo-sounding buoys will soon provide bathymetric control in inaccessible areas of the oceans. The SSPARR (Seafloor Soundings in Polar and Remote Regions) buoy project holds great promise for providing very low-budget bathymetry. Initial buoy implementation may be by hovercraft in the Arctic Ocean. An interesting new concept in low-budget hydrography is the introduction of relatively inexpensive drifting buoys equipped with echo sounders. For over twenty years, as a member of GEBCO's Sub-Committee for Digital Bathymetry (SCDB), I have pondered ways in which soundings might be obtained using vessels of opportunity. But problems of navigation, transducer mountings, system tweaking and... (read more)
2008-01-01 01:00:00

New Generation Hydrographic Databases

Enhancing data availability
The importance of data availability is increasingly being recognised, not just as an important topic for an exclusive section of the geospatial community but all over the geospatial spectrum, including the hydrographic community. If data is not available it’s no use! Traditionally, hydrographic production systems have data spread over multiple (chart) files and might be set up to include (relational) databases e.g. to store point features such as navigational aids. This has, for instance, been done for more than a decade with CARIS GIS, a widely used tool for chart production at Hydrographic Offices (HOs) and in combination with other... (read more)
2008-01-01 01:00:00

Searching for HMS Terror

Knowledge Gained in the Search for Franklin
“We know where the target is not located” is the only guaranteed result of any search expedition. This statement does not make for exciting headlines, however, the value of knowledge gained during the search itself and its many benefits to a variety of end-users, cannot be easily dismissed. The 2015 Franklin Expedition search coordinated by Parks Canada was the continuing multi-year, multi-partner effort that saw the discovery of HMS Erebus in September of 2014. In this article we will discuss the knowledge gained and multiple uses of the data collected toward our conclusion of verifying where HMS Terror is not... (read more)
2016-04-04 09:52:54

Flexible High-resolution Seismic Method

Used for Qualification of the Seabed
Traditionally, the upper part of the shallow seabed is investigated using low frequency echo sounders to enable safe navigation, and even lower frequency profilers for seabed structure mapping. However, the results of these systems often lack accuracy and, as a consequence, seabed properties are not known. A more accurate method, which results in seabed parameters, is obtained by the addition of the ultra-high resolution seismic sub-bottom system package Silas. It will be shown that Silas can be added to any echo sounding or profiling system. High-quality data acquisition is possible with only minor changes to standard survey practices. The data... (read more)
2016-02-01 03:46:20
Search Filter