Erratum: Combined wave - iceberg loading on offshore structures
0
Citation
0
Reference
10
Related Paper
Keywords:
Iceberg
Wave loading
Cite
: General considerations on offshore tanker berths and introduction to single buoy moorings Site selection for single buoy moorings Manoeuvring area Turning circle Design aspects of SBM systems Cargo hoses Throughput Water-hammer
Buoy
Hammer
Mooring
Cite
Citations (0)
Due to the ever increasing size of tankers and the inadequate facilities in the United States to accommodate these large vessels, a case is presented for the construction of offshore terminals utilizing the single buoy mooring system. Background information on the increase in size of tankers since 1961 is given, and a comparison of the single buoy mooring system to the offshore island terminal concept is also included. Reasons are given for preference of the single buoy mooring system over the offshore island, and several varied uses of the single buoy mooring system are also included in the discussion.
Buoy
Mooring
Cite
Citations (2)
Iceberg
Wave loading
Cite
Citations (0)
Offshore marine engineering, offshore aquaculture, and offshore environmental protection require periodic offshore surveys. At present, the main means of offshore marine surveys are mooring buoys and marine survey ships. Anchored buoys are fixed in place for a long time, which affects the navigation of ships. Therefore, mooring buoys cannot be deployed over a large area with high density. The cost of marine survey ships is high, especially when multipoint synchronous marine surveys are needed, and marine survey ships cannot perform offshore surveys under bad sea conditions. A profile autonomous underwater vehicle system is developed to meet the requirements of multipoint short-term synchronous offshore surveys. It is a small, reusable, low-cost equipment designed to move up and down at a mooring position while measuring temperature, salinity, depth, and other quantities along a vertical water section. Profile autonomous underwater vehicles can be commanded remotely and report their measurements in near real-time via wireless telemetry. The time it takes for a profile AUV to move up and down can indicate the current velocity. Tests were carried out on a wharf and in offshore areas, and the results were satisfactory.
Mooring
Cite
Citations (3)
Iceberg
Cite
Citations (14)
Over the last decade considerable attention has been given to evidence for the iceberg rafting of sediments into the North Atlantic, especially during Heinrich (H) events (presumed to be associated with short-lived, abrupt intervals of increased iceberg and meltwater flux).However, our knowledge of the present sediment distribution within icebergs and the fate of this sediment during iceberg drift is rudimentary.Debris is usually concentrated in a 1 3 m layer at the base of a glacier ; if present in calved icebergs, this layer is rapidly melted within a few 10s to 100s of km from an ice margin.Ice rafted debris (IRD) is frequently characterized by the weight percentage or counts of mineral grains within certain size fractions (i.e.> 63, > 250 Fun, etc.) with an implicit assumption that the selection of the size limits does not bias the data nor their interpretation.However, studies of glacial and glacial marine sediments indicate there is a poor correlation between the weight percentage in different sand-size classes, moreover, the bulk of glacially derived sediments are typically silts and clays (< 63 Fun).In areas close to the probable sources of iceberg discharge during Heinrich events, the abrupt changes are poorly defined by the sand-size IRD fraction but are dramatically highlighted by the input of fine-grained (< 63 Fun) detrital carbonate.During the last glaciation, abrupt changes in IRD concentrations (IRD spikes) appear to be an important feature of the mid-latitude belt of the North Atlantic, whereas at higher latitudes, such as areas of the Labrador and Nordic seas, IRD input was more continuous and individual H-events cannot be identified solely by their IRD signal.
Iceberg
Detritus
Cite
Citations (146)
For safe and efficient operations in the iceberg-infested waters offshore eastern Canada, accurate information on icebergs is needed. Databases on iceberg sightings, shapes and management techniques have been developed in order to bring all relevant iceberg information into one repository. Iceberg sightings have been recorded offshore Newfoundland and Labrador since the 1600s. Sighting methods, locations, yearly variability and uncertainties are discussed. In more recent times, detailed 2D and 3D measurements have been made of iceberg geometries, which are useful for structural load calculations. Techniques to deflect iceberg drift from critical offshore locations have also evolved over the past 40 years. The various methods that have been used for iceberg management are discussed, as well as the factors that affect their success rates. Relationships between historical iceberg populations and sea ice can be used to forecast iceberg severity in future seasons; updated correlations have been made between sea ice coverage and iceberg severity.
Iceberg
Cite
Citations (2)
Offshore mooring buoys are an inexpensive vessel storage solution. Unfortunately, offshore mooring buoys require substantially more water area than more expensive slips and piers. In some harbors, mooring anchorages have reached storage capacity and congest boat movement within harbors. The congestion in Newport Harbor, California triggered resident Marshall Duffield to propose replacing mooring anchorages with offshore mooring docks. These offshore docks enable vessels to be safely moored at a much higher density than mooring anchorages. By mooring vessels at a higher density, harbors can either reduce the water area dedicated to offshore vessel storage or they can increase mooring capacity without increasing the offshore mooring area. A case study of Newport Harbor demonstrates the use of mooring anchorages and the space savings potential of replacing the mooring anchorages with offshore mooring docks.
Mooring
DOCK
Cite
Citations (0)
Iceberg
Towing
Cite
Citations (4)
With increasing demand for oil, drilling operations are soon going to start in the North Barents Sea. This area experiences iceberg occurrences. A systematic mapping of iceberg needs to be done to keep a tab on the iceberg location. Also, a study is required to assess the loads that come on to the mooring system in case of an iceberg – floater interaction. Therefore, this paper seeks to create a systematic mapping procedure for the occurrence of icebergs in the North Barents Sea using MATLAB. Further, from information on iceberg attributes and drift speed, the paper computes the iceberg mass and energy to define a probability density function of encountering an iceberg of a particular size. A scenario of an iceberg-floater interaction has been studied for different contact area geometries based on the kinetic energy model. Forces that develop on the mooring lines of a floater have been computed to aid in the designing of the mooring system of structures operating in the region fraught with the dangers of floating icebergs like the North Barents Sea.
Iceberg
Mooring
Cite
Citations (2)