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Thursday, July 30, 2020 | History

2 edition of Arching of model ice floes found in the catalog.

Arching of model ice floes

Darryl J. Calkins

Arching of model ice floes

effect of mixture variation on two block sizes

by Darryl J. Calkins

  • 46 Want to read
  • 8 Currently reading

Published by [Dept. of Defense], Dept. of the Army, Corps of Engineers, Cold Regions Research and Engineering Laboratory in Hanover, N.H .
Written in English

    Subjects:
  • Ice.

  • Edition Notes

    StatementDarryl J. Calkins and George D. Ashton.
    SeriesCRREL report ; 76-42
    ContributionsAshton, George D., U.S. Army Cold Regions Research and Engineering Laboratory.
    The Physical Object
    Paginationiv, 11 p. :
    Number of Pages11
    ID Numbers
    Open LibraryOL15224530M

    Abstract. A preliminary research project has been carried out to determine the effect of small ice floes on a semi-submersible drilling unit. Physical model tests have been conducted with two main objectives: first, to determine the ability of the columns to prevent ice from passing between them (arching) and thus minimizing the chance of riser damage, and second, to determine the total ice.   An engrossing first person narrative by one of the 6 men that accomplished the amazing, hair-raising mile voyage from Elephant Island to S. Georgia Island in an open life boat, in order to accomplish the rescue of Shackleton's men left standed on the former island after the almostyr survival in the ice floes of the Antactic when the ship Reviews:

    Ice Floes and Flaming Water Hardcover – January 1, by Peter Freuchen (Author) out of 5 stars 2 ratings. See all 5 formats and editions Hide other formats and editions. Price New from Used from Hardcover "Please retry" — Reviews: 2. [1] Sea ice flux through the Nares Strait is most active during the fall and early winter, ceases in mid‐ to late‐winter after the formation of ice arches along the strait, and re‐commences after breakup in summer. In , ice arches failed to form. This resulted in the highest outflow of Arctic sea ice in the 13‐year record between and

      The globe is dotted with giant rocks known as glacial erratics that were carried over long distances by moving ice floes. Perhaps Stonehenge’s mammoth slabs . © Transformit, Inc. Gorham, ME USA; [email protected] ()


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Arching of model ice floes by Darryl J. Calkins Download PDF EPUB FB2

Additional Physical Format: Online version: Calkins, Darryl J. Arching of model ice floes. Hanover, N.H.: U.S. Cold Regions Research and Engineering Laboratory,   The ship model is mounted on a 4 Degree of Freedom (DoF) (except yaw and sway) Planar Motion Mechanism (PMM) carried by the towing Carriage.

In order to capture the physical behavior of the ice floes in the vicinity of the hull, two cameras are installed near the bow and stern of the ship model, as shown in Fig.

resistance measurement sampling rate is 50 Hz in the model : Z. Zong, B.Y. Yang, Z. Sun, G.Y. Zhang. Print book: EnglishView all editions and formats: Summary: A study of arching by fragmented ice floes across a gap in a surface obstacle is reported.

The study included several series of experiments in a hydraulic flume in which simulated ice was released upstream of the surface obstacle at controlled rates and the occurrence or non-occurrence.

Books; Compilations; parameter under study was the critical surface concentration of floes at the gap in the surface obstruction at which floes would form a stable arch across the gap and an ice jam would be initiated.

and other quantitatively different results depending on whether natural ice blocks or plastic blocks were used as model Cited by: Find the perfect ice floes stock photo.

Huge collection, amazing choice, + million high quality, affordable RF and RM images. No need to register, buy now. To model the ice floes, as close as possible with those used in the model test, the maximum and minimum size of the ice floes used in the model test were selected from the test photographs, and ice floes were then generated to have a random distribution between these two sizes.

Each ice floe was modeled as a randomly shaped quadrangle. Accurate prediction of ship resistance in ice covered waters is important for ice-going ships.

In this paper the resistance of a ship moving in waters covered with small ice floes is investigated. A simplified collision process is applied to model the ship-ice collision process such that the ship resistance can be theoretically determined with.

Canadian Coast Guard () and ABS Advisory () also recognized that the presence of various types of ice T such as thick first-year ice, old ice, ice floes, and deformed ice are significant risks for the Arctic navigation.

Marchenko () reveals in his study that most of the casualties in the Russian Arctic occurred due to sea ice. The effective model test methods of a square-type ice model basin in pack ice conditions were developed. Three individual pack ice channels, each with different concentrations of ice floe, were prepared using wooden staples, and these effects are verified in this research.

The minimum channel breadth for the pack ice conditions was more than 6 m. Confusingly, an ice floe is a section of sea ice. Sea ice is a different entity to glacial ice, being formed by frozen sea water.

Sea ice tends to be a few metres thick, floating on the ocean, and comes and goes with the seasons, though some survives from one year to the next. Ice floes are not to be confused with icebergs which have broken off. In the Smith Sound ice arch failed to form again, but a different ice arch at the northern terminus of Nares Strait (Fig.

1d) prevented ice floes from entering Nares Strait between 08. Sea ice is floating ice which is formed by the freezing of ocean water in the polar regions of the Earth, i.e., the Arctic and the Antarctic.

Thus, a closed smooth ice surface can be formed consisting of these ice configurations. In recent years, the simulation of sea ice evolution, especially for the use in climate models, became more important, see, for instance, Danilov et al.

(Geosci Model. INITIATION OF ICG JAMS-A LABORATORY STUDY. Ice jam initiation by a simple partial surface obstruction in a channel was studied experimentally in a channel was studied experimentally in laboratory flumes using polyethylene, paraffin, as well as real ice parallelepipeds, as model ice floes.

Our ice sheet reconstruction and palaeoclimate results go hand-in-hand with model simulations of ice sheet change, enabling us to better understand the drivers of Antarctic ice dynamics. Led by Dr Nick Golledge, an Associate Professor at the University of Wellington, New Zealand, we are using the Parallel Ice Sheet Model (PISM) to obtain.

In our melt pond Ising model the state variable is a binary (or spin) variable s i such that s i = +1 corresponds to absorptive melt water on the surface of our pixelated model sea ice floe and s i = −1 corresponds instead to reflective ice or snow on the surface.

And polar bears, despite their bulk, are very obliging: reluctant to get wet, they take giant leaps from one ice floe to another. One hopscotches over several floes.

But the gold medal goes to. Abstract: An investigation of the capabilities of a suite of seakeeping software to model the interactions of ice floes and icebreaking hull forms was initiated, as part of a wider investigation into arctic operations.

The sea keeping behavior of a systematic series of ice floes with variations in area extent and thickness, acting alone and in groups is analyzed and presented.

The first study of this kind focused on river ice jams and was followed with studies on floe field dynamics on a larger scale: macroscopic stresses to produce a yield curve and a constitutive model of a floe field, clustering of circular floes and dynamics of floes with complex shapes.

2D DEM has also been used to study ice arch formation. The author presents in The Drift of Sea Ice the fundamental laws of sea ice drift which come from the material properties of sea ice and the basic laws of mechanics.

The resulting system of equations is analysed for the general properties of sea ice drift, the free drift model and analytical models for ice drift in the presence of internal friction, and the construction of numerical ice drift.

As aqueous model ice is used extensively in ice tanks tests on the performance of ship hulls in sheet ice, it is imperative that such model ice replicate the main flexural strength behavior of. INTRODUCTION A kinematic model study of the arching phenomena in drifting ice was undertakn by Cal kins and Ashton In this report the factors influencing ice arching () who performed experiments in a flume using across straits or gulfs are investigated by developing square plastic pieces to simulate ice floes.

The plastic.Fitzcarraldo is a West German epic adventure-drama film written and directed by Werner Herzog and starring Klaus Kinski as the title character.

It portrays would-be rubber baron Brian Sweeney Fitzgerald, an Irishman known in Peru as Fitzcarraldo, who is determined to transport a steamship over a steep hill in order to access a rich rubber territory in the Amazon Basin.The scattering model considers the scattering effect of discrete ice floes, and wave energy transferred to ice floes by the excitation of heave, pitch and roll oscillation modes (Montiel & Squire, ; Perrie & Hu, ; many others).

Although the physics behind these two category models are quite different, both models can suggest an.