T-AGS 60 Class Oceanographic Survey Ships

In 1989 the Oceanographer of the Navy approved the construction of a new class of multimission oceanographic survey ship for the Naval Oceanographic Office, the T-AGS 60 class. The initial focus of the survey mission was primarily blue water oceanography. In the intervening years mission focus has shifted toward the littoral. This article presents the class mission capability and discusses the mission evolution to the littoral and the incorporation of a hydrographic survey capability which meets International Hydrographic Office requirements. It has been 13 years since the Oceanographer of the Navy established the requirements for the T-AGS 60 class oceanographic... (read more)
2008-01-01 01:00:00

INS and DVL for Out-of-Straightness Surveying

Inertial and Doppler, the Perfect Combination for 3D Pipeline Buckle Surveys
The move to deeper water, the proliferation of subsea completions, and the continued drive to lower costs are driving the requirement for more accurate out-of-straightness surveys. Pipelines are being designed to higher tolerances and are carrying warmer products at higher pressure. It is assumed that pipes will expand and move throughout their lifetime. Surveys are required to confirm that there are no un-planned buckles in the line. This article shows how INS (Inertial Navigation System) and DVL (Doppler Velocity Log) may be combined to meet these requirements. Out-of-straightness surveys are required to confirm that the pipe has moved as expected... (read more)
2012-04-19 04:27:25

The Seabed Survey Data Model

An Industry Data Model for Managing Seabed Survey Data
Exploration and Production (E&P) companies spend millions of dollars every year undertaking seabed surveys to acquire data to help in many exploration and production activities such as: determining potential well locations, identifying geophysical hazards (geohazards), the selection of potential pipeline routes and offshore facility locations, and asset maintenance. E&P companies utilise hydrographic survey companies to collect, process and deliver seabed survey data to improve project planning and manage risk. However, to extract the true value from the acquired data there is a need to ensure consistency in how the data is structured and delivered so that it is more efficiently... (read more)
2011-09-08 02:24:40

MAGIS for Geothermal Application

Guadeloupe Archipelago in French West Indies
For a long time magnetic surveys have been under-used because of their limited usefulness. In recent years technology has advanced considerably and magnetic recording can now be performed simultaneously with other geophysical data acquisition, even though the survey has not been specifically designed for magnetic acquisition. Magnetometers can adapt easily to a large variety of survey configurations (high speed, irregular survey lines path) and still produce high-resolution results. A marine survey was carried out off the western side of the Guadeloupe archipelago (French West Indies) in November 2003 by the BRGM (French Geological Survey). The Guadeloupe Archipelago is composed of... (read more)
2008-01-01 01:00:00

Integrating Offshore Tide Model Output with Onshore Observations

Improving Correctors to Hydrographic Survey Soundings
The National Oceanic and Atmospheric Administration (NOAA) develops tide correctors for reducing hydrographic survey soundings to Chart Datum by using the Tidal Constituent and Residual Interpolation (TCARI) software to interpolate harmonic constituents (HCs), tidal datum elevation relationships and water level residuals from observations. Due to the complex tidal regime and limited coastal observations in the Bering Sea, the error associated with tide correctors generated from the TCARI interpolation exceed the 45cm National Ocean Service standard in some offshore areas. In an effort to develop a higher quality tide corrector, a method of blending offshore HCs from high-resolution tide models and... (read more)
2015-08-27 02:18:45

Survey is Means for Preventing Damage to Nature

Hydro International Interviews Andy Hill
Andy Hill is key-note speaker at OI 10 in London and convening the Hydrography and Geophysics track of the conference. As Marine Geohazards Technical Authority at BP he states that the company undertakes hydrographic surveys to ensure safety, integrety and protection of the environment in all its operations. Mr. Hill, as convener of the Hydrography and Geophysics theme at the OI Conference in London this year, can you tell us about the scope of the sessions?We have split the theme up into three separate sections: we will have a session on AUV applications and developments, a series of papers on... (read more)
2010-03-02 01:47:17

ALB Evaluation for NOAA Charting Requirements

Creating Acceptance Test for Airborne Lidar Bathymetry Data Application to NOAA Charts in Shallow Waters
The National Oceanic and Atmospheric Administration (NOAA) acquires hydrographic data around the coasts of the US and its territories using in-house surveys and contracting resources. Hydrographic data are primarily collected using sonar systems, while a small percent is acquired via Airborne Lidar Bathymetry (ALB) for nearshore areas. NOAA has an ongoing requirement, as per the Coast and Geodetic Survey Act of 1947, to survey nearshore areas as part of its coastal mapping activities, including updating nautical charts, creating hydrodynamic models and supporting coastal planning and habitat mapping. NOAA has initiated a project to investigate the potential use of ALB data... (read more)
2013-12-04 04:38:42

Identification of the ­Wreck of the U.S.C.S.S. ­Robert J. Walker

From 21 to 24 June 2013, a NOAA team from the Office of Coast Survey (OCS) and the Office of National Marine Sanctuaries (ONMS) conducted a joint mission to explore a shipwreck off the coast of New Jersey near Absecon Inlet and Atlantic City. That wreck has proved to be the oldest known wreck of a hydrographic survey ship yet found, Robert J. Walker, a US Coast Survey ship wrecked in 1860 with loss of twenty crewmembers, whose tragic story resonates within NOAA to this day. The NOAA Ship Thomas Jefferson, performing hydrographic surveys off the New Jersey coast in... (read more)
2013-12-04 05:01:20

Europe Can Take Maritime Lead

Ian Shepherd is the EU Ambassador of the Sea.
In this capacity, he is working to improve maritime co-operation within Europe by formulating a maritime policy. Hydrointernationalhas taken the opportunity to interview him, while of course paying attention to the hydrographic perspective on this continent.<P> Please introduce yourself toour readers. Born in Glasgow, I was brought up in a family heavily steeped in shipbuilding and it was little surprise when I decided to go to the Britannia Royal Naval College. I spent 21 years in the Royal Navy, specialising in Underwater Warfare and Navigation and have subsequently worked in the oil and gas industry, shipbuilding as a Trials Master,... (read more)
2008-05-30 12:00:00

MSDI at the Flemish Coastal Division

Developing a Marine Spatial Data Infrastructure in Flanders, Belgium
The Flemish Hydrography, part of the Flemish government in Belgium, is currently setting up and integrating a Marine Spatial Data Infrastructure (MSDI) for the Belgian coast, the canal Ghent-Terneuzen and the River Scheldt. This process will be done in three consecutive phases, of which the first is nearing its testing phase. The newly developed MSDI will harmonise the data between land and sea. Not only within the Flemish government, but worldwide a shift can be seen in the appreciation and implementation of SDIs. Spatial Data Infrastructures tend to prove their use in all sorts of fields, ranging from spatial planning... (read more)
2011-03-16 12:16:00
Search Filter