What Users Want in Their Bathymetry

Bathymetry User Needs and Challenges in Australia and New Zealand
More and more users are demanding bathymetry to support many new and different applications. New applications have necessitated changes in data acquisition and processing technologies to meet user requirements. The complexity of these requirements needs to be better understood if bathymetric datasets are to be multi-usable, whilst being fit-for-purpose. A survey of Australia and New Zealand user needs has been conducted to better guide the acquisition and processing requirements of bathymetry users. Bathymetric Lidar is increasingly being collected to derive elevation for applications such as storm surge modelling, coastal inundation and vulnerability assessments. This bathymetry has also supported less obvious... (read more)
2012-10-05 04:38:52

Deepwater Market Forecast

The World Deepwater Market Forecast, published by energy analysts Douglas-Westwood, forecasts continued growth in the deepwater sector with annual expenditures reaching over USD24.6 billion by 2012. In this article, the authors present the key findings of the study.<P>   The underlying driver for all offshore activity is growth in global energy demand – which, for the medium term at least, means demand for hydrocarbons (predominantly oil and gas). Over the long term, the trend towards increasing energy consumption is clear. Global annual energy consumption has more than tripled over the past 50 years, driven mainly by demand growth in the... (read more)
2008-05-30 12:00:00

Project SHOA, Waves in Chile

40-year wave climate model for the Chilean coastline
A detailed study of swell wave conditions in the southern Pacific Ocean has been performed, with particular emphasis on the western Southern American coastline. This study was one part of an overall wave hindcasting investigation undertaken for the Servicio Hidrografico y Oceanogr√°fico de la Armada de Chile (SHOA) to define the inshore wave climate at various locations along the Chilean coastline. Chile is a long, relatively thin country that stretches along the western edge of the Southern American continent, as may be seen in Figure 1. It experiences large meteorological variability along this length. The climate varies from arid desert... (read more)
2008-01-01 01:00:00

Underwater Wireless Video Communication

New Horizon of Underwater Explorations
This article presents the development, production and testing of wireless underwater acoustic video communications, which is unique in the world today. It also discusses the implementation of this technique on Autonomous Underwater Vehicles (AUV’s) to perform inspections of underwater oil and gas pipelines. The achieved characteristics, limitations and upcoming prospects are presented. Currently, there are about 1000 Remotely Operated Vehicles (ROVs) and up to 700 AUVs in the world, according to Douglas-Westwood. In the coming 4 to 5 years it is expected that this fleet can be increased by 50-60% and may be even more than doubled. The vast majority... (read more)
2016-09-27 04:18:23

Tsunami Local Alarm System

Tsunamis are in no way a new phenomenon, but the December 2004 tsunami drew attention to warning systems and generated new ideas for those capable of providing timely warning, even when a tsunami is generated near the coast. This article describes such a system, currently at a conceptual stage. The disastrous submarine earthquake of 26th December 2004 to the west of Sumatra caused a tsunami that cost the life of hundreds of thousands. It devastated communities and infrastructure and deprived people of the means of sustaining themselves. Disastrous tsunamis have been known throughout history, such as the one that destroyed... (read more)
2008-01-01 01:00:00

Hydrographic Survey Data Integration

Combining independent data sets to present the full picture
The next step in the presentation of hydrographic survey data is the integration of separate data sets into navigable three-dimensional models. Software tools now available allow contractors to produce geo-referenced presentations of various data sets including bathymetry, sonar imagery and sub bottom information. By combining these data sets together into a three dimensional model the contractor can provide the end user with tools that allow informed decisions to be rapidly made about the suitability of an area for the proposed purpose. These presentations also provide the contractor and end users with a powerful tool for gauging the quality of the... (read more)
2008-01-01 01:00:00

Platform Decommissioning

Survey Opportunities to Optimise the Task
Oil and gas fields in the North Sea and elsewhere in the western world developed rapidly during the oil crisis of the seventies, when this commodity quadrupled in price. Now the first of approximately five hundred platforms have reached the end of their technical lifetime and need decommissioning. Heerema Marine Contractors has been involved in removing several complexes and here describes two cases, illuminating the survey aspects. Removal of facilities is very much an engineering challenge whereby safety and environmental issues play an important role. Historically, their installation involved surveyors who provided all precision positioning, dedicated equipment and proprietary software... (read more)
2007-05-09 12:00:00

Coastline Migration in Nigeria

The coastal zone of Nigeria has in recent years been subjected to increasing economic activities, primarily driven by seaport activities and oil exploration and exploitation. These activities have reportedly resulted in accelerated shoreline erosion estimated at between 20-30m per annum. Historical data derived from aerial photographs for a section of the Nigerian coastline spanning the years 1900-2002 has been used here to estimate shoreline dynamics, now conservatively put at 1.7m per annum, corresponding to a net sediment loss of 7.3m2 per annum. The 853km long Nigeria coastline runs through seven of the Southern States of the Federation, Lagos, Ondo, Delta,... (read more)
2008-01-01 01:00:00

Dams and Lakes, Problems and Possibilities

Dams generate 20% of the world's electricity. They also provide flood control, supply water to cities and can assist river navigation. Many dams are multipurpose, providing two or more of these benefits. The first written record of a dam is by the Greek historian Herodotus, describing that built across the River Nile in about 2900 BC to protect the city of Memphis from flooding. The Romans also built dams, two of which are still in use today. Behind dams lie artificial lakes containing accumulated water for their proper functioning. Vast areas of land have disappeared beneath the surface of these... (read more)
2008-01-01 01:00:00

GEBCO: the Second Century

Looking towards a general bathymetric chart
The General Bathymetric Chart of the Oceans (GEBCO), the archetype of Ocean Mapping at a world-ocean scale, celebrated its centenary last year with the release of an updated and greatly enhanced Digital Atlas. This CD contains gridded soundings and contours, the culmination of one hundred years of successful blending of hydrography and oceanography. This reflects the creative co-operation of both organisations such as the International Hydrographic Organisation and Intergovernmental Oceanographic Commission and those working side by side at individual level: hydrographers, geologists and geophysicists each contributing their different skills. This major accomplishment also represents the first step into the next... (read more)
2008-01-01 01:00:00
Search Filter