A Personal View Who
should bear the cost of quality? R Pond
Letter
A regional initiative to manage the Bay of Bengal’s coastal and marine
environment and its living resources P Verlaan
Review
Lander techniques for deep-ocean biological research
PM Bagley, IG Priede, AD Jamieson, DM Bailey, EJV Battle, C Henriques and KM
Kemp
Excess pore pressures induced by installation of suction caissons in NC clays
J Cao, R Phillips, R Popescu, JME Audibert, Z Al-Khafaji,
Laser stripe imaging to determine three-dimensional information on fish shoals S Tetlow, S Creaven, EG Jones and DG Reid
Mapping seabed biotopes using sidescan sonar in regions of heterogeneous
substrata: Case study east of the Isle of Wight, English Channel CJ Brown, AJ Hewer, WJ Meadows, DS Limpenny, KM Cooper and HL Rees
Interfaces between the submarine cable industry and other seabed users around UK
coastal waters N Irvine and R Borwick
Technical diving M Caney
Book Review:
The Sea's Enthrall: Memoirs of an Oceanographer, by Dr Timothy Parsons Reviewed by M Angel
Underwater
Technology Vol 26 No 2
Summer 2005
A Personal View
Marine Renewables — Will the UK drop the ball
(again)?
P Wolfe
Technical Papers
Trends in scientific diving: an analysis of
scientific diving operation records, 1970-2004
MDJ Sayer and J Barrington
Closed loop identification of a remotely operated
flight vehicle
M Wang and R Sutton
Technical Briefings
The use of renewable energy systems in coastal
defence
JW Griffiths, DE Lennard R Kirby, T Thorpe
Seabed coring in the ice-covered waters of the
Arctic Ocean for the Integrated Ocean Drilling Program
D Evans and A Skinner
Meeting Reports
Current status of marine minerals
David Cronan
The 6th Renewable Energy Finance Forum (REFF) and
marine renewables
Don Lennard
Book Reviews
Dive, Dive, Dive — Submarines at war, by Michael
Gunton
Reviewed by DR
Wardle
Raising the Kursk, by Hans Offringa
Reviewed by Roger
Chapman
Underwater Technology Vol 26 No 3
Winter 2005
A Personal View
The role of Subsea UK
DL Pridden
Letter
Second letter from Madras: Progress
in the Bay of Bengal Large Marine Ecosystem (BOBLME) Programme
P Verlaan
Review
A review of the uses of work-class
ROVs for the benefits of science: Lessons learned from the SERPENT
project
IR Hudson, DOB Jones and BD Wigham
Abstract: This paper reviews the
contributions of underwater science in continuing to develop new
technology to explore the marine environment and how
collaborations taking place between the oil and gas industry and
science are facilitating this process. A case study focuses on
some of the results and highlights from the SERPENT Project.
SERPENT (Scientific and Environmental ROV Partnership using
Existing Industrial Technology) is a collaboration programme
that was designed to make better use of remotely operated
vehicle (ROV) technology and data available through links with
marine operations in the oil and gas industry. Oil and gas
exploration and production activities in the marine environment
are increasing. The amount of global hydrocarbon reserves
removed from below the seafloor is set to increase over the next
5–10 years with exploration heading into deeper, more remote
waters, many of which have yet to be fully explored. The only
way that these remote areas may be documented is through a
working relationship with industry, with mutual benefit for both
sides, and learning from technology that is already in place for
the benefit of science.
Technical Papers
Research on the pressure compensation
for the underwater hydraulic motor
YM Li and QF Wang
Abstract: Considering the influence
of underwater ambient pressure (UAP) on underwater hydraulic
motors (UHM), and utilising the state-of-the-art of pressure
compensation of underwater hydraulic systems (UHS), this paper
proposes a pressure compensation technique for the UHS where the
hydraulic power unit is installed inside a deep diving
submersible or a submersible drilling platform with atmospheric
pressure, some actuators of which are directly surrounded by
seawater and others are installed inside it. An underwater
ambient-pressure-compensation valve (UAPCV) has been developed.
The pressure in the return line of the external sub-circuits of
the UHS is compensated by this UAPCV, but not that of the
internal sub-circuits. Theoretical analysis, simulation and
experimental results show that reliable pressure compensation
can be ensured with a small flow-rate by the UAPCV. The
operational performance of the UHM is further improved after its
leakage pressure and return pressure are compensated.
Estimation of underwater noise – a
simplified method
RA Hazelwood and J Connelly
Abstract: A set of procedures has
been developed to allow preliminary estimates to be made of
underwater noise and its effects on marine species. They do not
require detailed acoustic survey data, either of the site or of
the proposed plant. However, they still facilitate the
comparison of different project proposals to assist in the
optimisation of equipment layout and routing. Noise may be due
to specific sources, such as ships and marine equipment, or
assessed as a general background level. Some aspects of acoustic
analysis applicable to more detailed environmental impact
assessments are also described, particularly relevant when
comparing noise spectra with audiometry data appropriate to
different species of wildlife.
The use of fault tree analysis to
visualise the importance of human factors for safe diving with
closed-circuit rebreathers (CCR)
S Tetlow and S Jenkins
Abstract: Closed-circuit rebreathers
(CCR) have been used for many years in military diving but have
only recently been adopted by technical leisure divers, media
and scientific divers. Rebreather divers appreciate the value of
training, pre-dive checks and equipment maintenance, but it is
often difficult to visualise just how important these factors
are and how they inter-relate for a rebreather. In this paper,
the well-known technique of fault tree analysis (FTA) is used to
identify risk in a rebreather. Due to space constraints, only
the branch of the tree for unconsciousness as a result of
hyperoxia is considered in detail but, in common with the whole
tree, end events are shown to be human-factor related. The
importance of training to the emergency situation, the use of
formal pre-dive checklists and the value of good design to
prevent accident escalation are discussed further.
Results of cylinder detection and
fitting from real three-dimensional underwater acoustic images
RC Patel and AR Greig
Abstract: For remotely operated
underwater vehicles operating in the vicinity of offshore
platforms, the object recognition and detection of cylinders is
of importance because many platforms are constructed from
connected tubular elements. This paper briefly reviews acoustic
cameras and then presents a cylinder-based model matching
procedure for 3D underwater acoustic camera images. Cylinder
identification is achieved using a combination of information
from the 3D acoustic image and the 2D intensity map. The paper
concludes with some sample results of images of a scaled oilrig
structure captured using a 3D acoustic camera.
Book Reviews
Oceans 2020: Science, Trends, and the
Challenge of Sustainability
Reviewed by T Guymer
Underwater Technology Vol 26 No 4
Summer/Autumn 2006
A
Personal View
Supporting new waves in marine technology
L Slade
Technical
Papers
Transient free-surface waves due to impulsive motion
of a submerged source
J-J Shu
Abstract: The problem of a viscous flow past a
submerged source starting from rest and moving with a constant velocity, below
and parallel to a free surface, is examined and asymptotic expressions for
long-time evolution of free-surface elevation are obtained. The results show
explicitly the viscous effect on the free-surface elevation and no surface
tension effect on the asymptotic wave.
Extracting the cultural heritage: new challenges for
the underwater archaeologist
G Momber
Abstract: Analysis of archaeological sites
stratified within marine sediments can open a window to cultures that are now
lost between the waves. These sites and their environmental context harbour a
resource that can also provide index points for sea level rise during a period
of acute climate change. A decade of archaeological investigations in the
western Solent by the Hampshire and Wight Trust for Maritime Archaeology,
utilising divers and geophysical survey data, has led to the discovery of
Mesolithic sites within submerged landscapes. They lie between 6.5m and 11.5m
below British Ordnance Datum. However, the discovery of these delicate and
vulnerable sites is presenting new challenges to the maritime archaeologist. The
need to record, rescue and interpret the remains underwater sampling techniques.
Technical
Briefing
Sea bass (Dicentarchus Labrax) and a sea change for
21st century fisheries
J Hind
Meeting
Reports
Selected Summary Highlights from the 53rd Meeting of
the intergovernmental Marine Environment Protection Committee (MEPC 53) of the
International Maritime Organization (IMO), 18–22 July 2005
P Verlaan
Selected Summary Highlights from the 27th
Consultative Meeting (LC 27) of Contracting Parties to the Convention on the
Prevention of Marine Pollution by Dumping of Wastes and Other Matter 1972
(London Convention 1972) held at IMO Headquarters, 24–28 October 2005
P Verlaan
Book
Review
Diving and Subaquatic Medicine, by Carl Edmonds et
al
