Development of Hull Forms for a 190,000 DWT Icebreaking Ore Carrier

2011 ◽  
Author(s):  
Kyung Duk Park ◽  
Yong Kwan Chung ◽  
Young Sik Jang ◽  
Hyun Soo Kim ◽  
David Molyneux
Keyword(s):  
Open Water ◽  
Bulk Carrier ◽  
Hull Form ◽  
Model Experiments ◽  
Pack Ice ◽  
Ice Conditions ◽  
Level Ice ◽  
Fast Ice ◽  
Improved Performance ◽  
Hull Forms

This paper describes the development of three candidate hull forms for 190,000 DWT ore carrier for operation in ice covered water. It builds on Hyundai Heavy Industries expertise in ore carrier design, and discusses some of the changes required for operation in heavy ice conditions. The overall concept was to have a target speed of 6 knots in land fast ice 1.7m thick and 15 knots in open water. Three candidate bow shapes were designed and analyzed, based on a common stern arrangement. The development of the hull form included three methods of predicting the performance of the ships in ice. Empirical analysis was carried out for all three hulls, based on experience gained from model experiments on bulk carrier hull forms in ice. Numerical analysis was carried out on all three bow shapes using a computer program (based on the discrete element method) to simulate the interaction between the ship and the ice. Physical model experiments were carried out for resistance and propulsion in level ice, pack ice and ridges on the selected design. As a result of the model experiments, the selected bow shape was modified to reduce its resistance in ice. The improved performance of the modified hull was confirmed with additional numerical simulations.

Hull Forms for Icebreaking Tankers

2004 ◽  
Author(s):  
Hyun-Soo Kim ◽  
Mun-Keun Ha ◽  
Dang Ahn ◽  
David Molyneux ◽  
Ho Hwan Chun
Keyword(s):  
Open Water ◽  
Ship Design ◽  
Pack Ice ◽  
Ice Conditions ◽  
Level Ice ◽  
Arctic Ice ◽  
Trade Route ◽  
Open Water Performance ◽  
Hull Forms ◽  
Almost All

The optimum design for an icebreaking tanker will depend on the trade route and the cargo delivery requirements. For example, the hull shape of a ship that spends almost all of its time operating in heavy ice can be optimized for low speed icebreaking conditions. In contrast, a ship that spends a small portion of its time in light ice that has been previously broken and the rest of its time in open water can be optimized for different requirements. The challenge for the designer is complicated by the observation that many ship design features that enhance powering performance in ice are detrimental to open water performance. This paper presents predictions of ship resistance in pack ice, level ice and open water for four tanker designs, which include a conventional hull with no modification for ice at all and three designs proposed for operation in Arctic ice conditions. The predictions of ship performance are based on model experiments carried out in Canada and Korea. The resistance of the four hulls in open water, two concentrations of pack ice and two level ice thicknesses are compared and discussed. Information of this sort is essential for developing the optimum ship design for a particular shipping route, given known profiles of open water, pack ice and level ice.

scholarly journals Ice Conditions of an Arctic Polynya: North Water in Winter

1986 ◽  
Vol 32 (112) ◽  
pp. 383-390 ◽  
Author(s):  
Konrad Steffen
Keyword(s):  
Sea Water ◽  
Surface Condition ◽  
Open Water ◽  
Sea Surface ◽  
Aerial Images ◽  
The Arctic ◽  
The North ◽  
North Water ◽  
Ice Conditions ◽  
Fast Ice

AbstractThe surface condition of the North Water was investigated during two winters (i.e. the three polynyas: Smith Sound polynya, Lady Ann Strait polynya, and Barrow Strait polynya). Since no detailed information was available on ice conditions and the extent of open water during winter, radiometric temperature measurements of the sea surface had to be taken along a flight line of 2650 km from an altitude of 300 m. From November to March 1978-79 and 1980-81, 14 remote-sensing flights were carried out. On the basis of the radiometric measurements, the following ice types were identified: ice-free, dark nilas, light nilas, grey ice, grey-white ice, and white ice. A comparison between the thermal and the visual ice classification (the latter being based on grey tones of the aerial images) showed a deviation of 3%. The analysis showed that in November, December, and January more than 50% of the Smith Sound polynya was covered by young ice, nilas, and ice-free, whereas in February and March white ice was dominant. Moreover, it was found that the two polynyas in Smith Sound and Lady Ann Strait were much smaller than previously believed. In Barrow Strait, a semi-permanent polynya was observed in the winter of 1980-81. The occurrence of polynyas in Barrow Strait seems to be connected with the location of the fast-ice edge. On the basis of the calculated ice-type distribution and heat-flux rates for different ice types, an energy loss of 178 W m-2was found on the surface of the Smith Sound polynya due to open water and thin ice for the winter months November to March. Compared with other ice-covered sea surfaces in the Arctic, the heat release by the sea-water in the Smith Sound polynya is about 100 W m-2larger.

New records of mummified crabeater seals on islands bordering Admiralty Sound, Weddell Sea

2019 ◽  
Vol 31 (3) ◽  
pp. 109-115
Author(s):  
Javier Negrete ◽  
Leopoldo H. Soibelzon ◽  
Esteban Soibelzon ◽  
Jorge Lusky
Keyword(s):  
Open Water ◽  
Weddell Sea ◽  
Pack Ice ◽  
Breeding Grounds ◽  
Ice Conditions ◽  
Crabeater Seals ◽  
Ice Floes ◽  
Early Breakup ◽  
Natural Trap ◽  
Seymour Island

AbstractNinety-six mummified crabeater seals discovered at Seymour Island (Isla Marambio) are reported. Each specimen was georeferenced, photographed and assigned to five different taphonomic states. Previous work stated that seals at Seymour Island get stranded inland around the breeding season. However, it is not clear if the species breeds in this area. The abundance of crabeater seals and the ice condition along Admiralty Sound (Estrecho Bouchard) were obtained by aerial surveys during spring (2015–17). It appears that the species uses the strait as a passage to breeding grounds. Under heavy ice conditions, the seals become stranded in the middle section of this strait and wander inland through a valley that represents the mouth of an ephemeral stream that ends at the pack ice level. This situation was observed in 2014 and 2015 when recently dead seals were found, evidencing that this natural trap is still active. Nonetheless, in 2016 and 2017, during an early breakup of Admiralty Sound, the seals that remained in the area were more numerous than in 2015 but they did not get stranded inland. This early breakup may encourage the seals to breed there in the presence of open water areas with ice floes.

Icebreaking Model Tests: Systematic Variation of Bow Lines and Main Dimensions of Hull Forms Suitable for the Great Lakes

1973 ◽  
Vol 10 (03) ◽  
pp. 236-243
Author(s):  
Bengt M. Johansson ◽  
Eero Makinen
Keyword(s):  
Great Lakes ◽  
Power Level ◽  
The Other ◽  
Systematic Variation ◽  
Bulk Carrier ◽  
Basic Form ◽  
Speed Range ◽  
Level Ice ◽  
Hull Forms ◽  
Ice Resistance

Nine bulk carrier models were tested in the Wartsila Icebreaking Model Basin (WIMB) in Helsinki, Finland. Eight of the models form a series with systematically varying parameters. This test series was the first one in which the influence of bow form, ship length and, ship beam on ice resistance was investigated systematically. The basic form was that of the existing Great Laker SS Ryerson, which was not originally designed for navigating in ice. The other models were modified in order to improve their icebreaking capability. The main objective was to study the icebreaking resistance in level ice, but in addition some tests were made for determining the ice resistance in a broken channel and for determining the steering ability of the models. All models were tested in level ice of 1, 2 and 3 ft thickness and at a speed range of 0–12 knots. Finally, a method for the calculation of the ice resistance and necessary power level of the Great Lakers is presented.

Interaction of Vessel with Channel under Navigation among Small Ice Floes

2015 ◽  
Author(s):  
Vadim K. Goncharov ◽  
Ekaterina S. Zueva ◽  
Natalia Yu. Klementieva
Keyword(s):  
Ice Cover ◽  
Problem Definition ◽  
Arctic Seas ◽  
Cross Sectional ◽  
Side Force ◽  
Pack Ice ◽  
Cross Sectional Dimension ◽  
Ice Conditions ◽  
Fast Ice ◽  
Ice Floes

For maintenance of navigation during wintertime in Arctic seas, icebreakers create the wide channels in the fast ice cover or pack ice cover at water areas near to ports with intensive vessel traffic. Within such wide channels cargo ships and tankers can move in both directions independently without icebreaker pilotage among small ice floes. Because the cross-sectional dimension of the channel is restricted, the ships are forced to displace from the center and move on a close distance between their board and border of channel. The space between ship hull and borders is filled by small ice floes, and its concentration near the starboard and portside differs. The ice resistance on each board also differs. Therefore, side force and yawing moment arise that are able to cause the collision with the channel border. This paper contains the detailed problem definition and the main points of the mathematical model of vessel interaction with the channel border. As an example of model application possibilities, the simulation of loads on the hull of the vessel was performed. Outcomes of the investigation are dependent upon the side force and yawing moment on the distance from the channel border and ice conditions.

scholarly journals Ice Conditions of an Arctic Polynya: North Water in Winter

1986 ◽  
Vol 32 (112) ◽  
pp. 383-390 ◽  
Author(s):  
Konrad Steffen
Keyword(s):  
Sea Water ◽  
Surface Condition ◽  
Open Water ◽  
Sea Surface ◽  
Aerial Images ◽  
The Arctic ◽  
The North ◽  
North Water ◽  
Ice Conditions ◽  
Fast Ice

AbstractThe surface condition of the North Water was investigated during two winters (i.e. the three polynyas: Smith Sound polynya, Lady Ann Strait polynya, and Barrow Strait polynya). Since no detailed information was available on ice conditions and the extent of open water during winter, radiometric temperature measurements of the sea surface had to be taken along a flight line of 2650 km from an altitude of 300 m. From November to March 1978-79 and 1980-81, 14 remote-sensing flights were carried out. On the basis of the radiometric measurements, the following ice types were identified: ice-free, dark nilas, light nilas, grey ice, grey-white ice, and white ice. A comparison between the thermal and the visual ice classification (the latter being based on grey tones of the aerial images) showed a deviation of 3%. The analysis showed that in November, December, and January more than 50% of the Smith Sound polynya was covered by young ice, nilas, and ice-free, whereas in February and March white ice was dominant. Moreover, it was found that the two polynyas in Smith Sound and Lady Ann Strait were much smaller than previously believed. In Barrow Strait, a semi-permanent polynya was observed in the winter of 1980-81. The occurrence of polynyas in Barrow Strait seems to be connected with the location of the fast-ice edge. On the basis of the calculated ice-type distribution and heat-flux rates for different ice types, an energy loss of 178 W m-2 was found on the surface of the Smith Sound polynya due to open water and thin ice for the winter months November to March. Compared with other ice-covered sea surfaces in the Arctic, the heat release by the sea-water in the Smith Sound polynya is about 100 W m-2 larger.

Occurrence and effects of open water in McMurdo Sound, Antarctica, during winter and early spring

Polar Record ◽  
1967 ◽  
Vol 13 (87) ◽  
pp. 775-778 ◽  
Author(s):  
B. Stonehouse
Keyword(s):  
Late Summer ◽  
Open Water ◽  
Early Spring ◽  
Easy Access ◽  
High Latitudes ◽  
Mcmurdo Sound ◽  
Pack Ice ◽  
Fast Ice

McMurdo Sound is well known as an area comparatively free from fast ice during the middle and late summer. Although closed to its discoverer in February 1841 by contrary winds, pack ice and new ice (Ross, 1847), the sound provided easy access to high latitudes in January and February on at least ten occasions between 1902 and 1916. Since 1955, icebreakers have assisted shipping movements in November and December, and possibly helped in dispersing the winter fast ice by cutting wide channels from Cape Bird southward. However, northerly swells and south-easterly gales are sufficient in most years to disperse fast ice from the southern end of the sound by mid or late February (Heine, 1963).

Arctic sea ice extent and thickness

1995 ◽  
Vol 352 (1699) ◽  
pp. 301-319 ◽  
Keyword(s):  
Sea Ice ◽  
Open Water ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Ice Thickness ◽  
Sea Ice Extent ◽  
Arctic Sea ◽  
Ice Conditions ◽  
Fast Ice ◽  
Arctic Sea Ice Extent

Current knowledge on Arctic sea ice extent and thickness variability is reviewed, and we examine whether measurements to date provide evidence for the impact of climate change. The total Arctic ice extent has shown a small but significant reduction of (2.1 ± 0.9)% during the period 1978-87, after apparently increasing from a lower level in the early 1970s. However, open water within the pack ice limit has also diminished, so that the reduction of sea ice area is only (1.8 ± 1.2)%. This stability conceals large interannual variations and trends in individual regions of the Arctic Ocean and sub-Arctic seas, which are out of phase with one another and so have little net impact on the overall hemispheric ice extent. The maximum annual global extent (occurring during the Antarctic winter) shows a more significant decrease of 5% during 1972-87. Ice thickness distribution has been measured by submarine sonar profiling, moored upward sonars, airborne laser prohlometry, airborne electromagnetic techniques and drilling. Promising new techniques include: sonar mounted on an AUV or neutrally buoyant float; acoustic tomography or thermometry; and inference from a combination of microwave sensors. In relation to climate change, the most useful measurement has been repeated submarine sonar profiling under identical parts of the Arctic, which offers some evidence of a decline in mean ice thickness in the 1980s compared to the 1970s. The link between mean ice thickness and climatic warming is complex because of the effects of dynamics and deformation. Only fast ice responds primarily to air temperature changes and one can predict thinning of fast ice and extension of the open water season in fast ice areas. Another region of increasingly mild ice conditions is the central Greenland Sea where winter thermohaline convection is triggered by cyclic growth and melt of local young ice. In recent years convection to the bottom has slowed or ceased, possibly related to moderation of ice conditions.

Sealing and sealing methods in the Bay of Bothnia, 1551–70

Polar Record ◽  
1991 ◽  
Vol 27 (163) ◽  
pp. 339-344 ◽  
Author(s):  
Roger Kvist
Keyword(s):  
Prey Species ◽  
Open Water ◽  
16Th Century ◽  
Species Numbers ◽  
Ringed Seals ◽  
Pack Ice ◽  
Tax Returns ◽  
Fast Ice ◽  
Ice Edge

AbstractSeals were hunted in the Bay of Bothnia during the 16th century in four areas — inshore open water, fast ice, ice edge, and pack ice — with methods appropriate for each area. Inshore open water sealing involved netting and some seining, exclusively for ringed seals. On fast ice the techniques used were stalking, den-hunting, and breathing hole-hunting, again for ringed seals. Grey and ringed seals were hunted on the ice edge. Provincial tax returns have provided information on methods used by sealers from different parishes in the Bay of Bothnia area. Catching techniques, tools, prey species, numbers of crews, hunting seasons, catch figures and annual yields are discussed.

Impact of the Mertz Glacier Tongue calving on the emergence of polynyas in the d'Urville Trough, East Antarctica

2020 ◽  
Author(s):  
Lucile Ricard ◽  
Marie-Noelle Houssais ◽  
Christophe Herbaut ◽  
Alexander Fraser ◽  
Rob Massom ◽  
...  
Keyword(s):  
Sea Ice ◽  
Microwave Remote Sensing ◽  
Sea Ice Concentration ◽  
Glacier Tongue ◽  
Pack Ice ◽  
Ice Concentration ◽  
Ice Conditions ◽  
Fast Ice ◽  
Ice Production ◽  
The Impact

<p> </p><p><br>Passive microwave remote sensing observations and atmospheric data are used to characterize the impact of the Mertz Glacier Tongue (MGT) calving in February 2010 on the sea ice conditions in the D’Urville Trough, East Antarctic shelf (139°E-141°E). The main objective is to determine if conditions for dense shelf water production in this area were possibly influenced by the calving. In particular, we look for the existence of winter polynyas capable of sustaining significant sea ice production, a prerequisite for the formation of dense, saline waters. We show that polynyas in the D'Urville area are part of a complex icescape made of fast ice and drifting pack ice. The seasonal evolution of this icescape has been profoundly modified with the calving of the MGT and opening of new polynyas. Pre-calving and post-calving sea ice concentrations are analyzed to identify major patterns of variability. Examination of the fast ice distribution and atmospheric forcing helps to develop a scenario for the formation of low sea ice concentration regions and their relation to the sea ice fluxes, supporting the conclusion that the role of the Adelie Bank as a barrier to the drift ice may have strengthened after the calving.</p>

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