Eccentric impact of an ice feature: linearized model

Matskevitch, Dmitri

doi:10.1016/s0165-232x(96)00009-2

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…Much of the research on iceberg collisions has investigated the forces resulting from iceberg collisions on man‐made structures in the ocean and has involved solving the equations of the forces acting on each element of a body over the duration of an impact, with certain assumptions [ Duthinh and Marsden , 1986; Duthinh and Fuglem , 1988; Duthinh et al , 1990; Matskevitch , 1997]. The other body of literature relevant to iceberg collisions concerns sea ice dynamics and floe‐floe collisions of pancake‐ice.…”

Section: Sedberg Modelmentioning

confidence: 99%

“…a large force is applied over a very short period of time) while the position and orientation of the iceberg remains the same. This is an additional simplification compared to the model by Matskevitch [1997]. The only variable that changes during the collision is the velocity, and therefore the momentum ( p = m v ) also changes, which is the impulse of the collision.…”

Section: Sedberg Modelmentioning

confidence: 99%

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Modeling iceberg‐rafted sedimentation in high‐latitude fjord environments

Mugford¹,

Dowdeswell²

2010

J. Geophys. Res.

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[1] An iceberg model, SedBerg, has been developed to simulate sedimentation in highlatitude glaciated fjords. Sediments deposited in fjords provide an important record of glaciological response to changing climatic conditions. The model simulates the formation, drift, and melt of a population of icebergs utilizing Monte Carlo-based techniques with a number of underlying parametric probability distributions to describe the stochastic behavior of iceberg formation and dynamics. The model captures iceberg dynamics and melt in fjord environments and has been applied to Kangerdlugssuaq Fjord in east Greenland as an example of an iceberg-dominated sedimentary environment. Sedimentation has been simulated over the past 1500 years, encompassing the climatic intervals of the Medieval Warm Period (MWP) and the Little Ice Age (LIA). Model results have been compared with the observed sedimentary record. The model demonstrates that the glaciological regime, e.g., basal debris thickness, mean annual calving rate, mean iceberg size, plays a more important role than the direct influence of climate (ocean and air temperatures) on iceberg sedimentation rate, although often changes in climate result in changes to the glaciological regime.

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Section: Sedberg Modelmentioning

confidence: 99%

Section: Sedberg Modelmentioning

confidence: 99%

Modeling iceberg‐rafted sedimentation in high‐latitude fjord environments

Mugford¹,

Dowdeswell²

2010

J. Geophys. Res.

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“…Eccentric and oblique impacts systematically reduce the maximum impact force as each is increased. The effects of eccentricity can be estimated using the formula of Matskevitch (1997). The effects of obliqueness are proportional to the sine of the angle of impact.…”

Section: Discussionmentioning

confidence: 99%

“…Eccentricity describes the degree to which the axis of the impact misses the center of gravity of the log. The reduction of the impact force as a result of eccentricity can be estimated using the analytic expression developed by Matskevitch (1997)…”

Section: Impact Eccentricitymentioning

confidence: 99%

“…For the eccentric impacts in Figure 14, the impact location is expressed as a normalized distance, where ε o is the distance from the center of the log and r i is the radius of gyration for the log. We also display the Matskevitch's (1997) estimate of the decrease in the maximum impact force with increasing eccentricity. His estimate provides a reasonable fit to the data, although the measured data show a more rapid decrease in the maximum impact force with eccentricity.…”

Section: Debris Orientation On Impactmentioning

confidence: 99%

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Maximum Impact Force of Woody Debris on Floodplain Structures

2004

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Public reporting burder for this collection of information is estibated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burder to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. ABSTRACT We collided woody debris (i.e. logs) with structures using flume and test basin laboratory facilities to investigate the maximum impact force that floodplain structures are exposed to by floating woody debris. The tests investigated the influence of collision geometry and construction material of the structure face on the maximum impact forces. Collision geometry was determined by the debris orientation on impact. We reviewed the three approaches that represent the existing guidance on maximum impact forces. Each approach estimates the maximum impact force based on the debris velocity and mass. We show that all the existing approaches can be derived from a singledegree-of-freedom model of the collision and can be considered to be equivalent. The laboratory data show that the maximum impact force was associated with a log striking a rigid structure with its end. Oblique and eccentric collisions reduced the maximum impact load in a predictable and consistent manner. The approach we refer to as ?contact stiffness,? a linear, one-degree-of-freedom model with no damping, was able to reproduce the laboratory results over the entire range of data, with an effective contact stiffness of 2.4 MN/m. All the existing guidance was applied to the laboratory data, and the strengths and weakness of each are discussed. Abstract: We collided woody debris (i.e. logs) with structures using flume and test basin laboratory facilities to investigate the maximum impact force that floodplain structures are exposed to by floating woody debris. The tests investigated the influence of collision geometry and construction material of the structure face on the maximum impact forces. Collision geometry was determined by the debris orientation on impact. We reviewed the three approaches that represent the existing guidance on maximum impact forces. Each approach estimates the maximum impact force based on the debris velocity and mass. We show that all the existing approaches can be derived from a REPORT DATE (DD-MM How to get copies of ERDC technical publications:Department of Defense personnel and contractors may order reports through th...

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Offshore pipeline protection against seabed gouging by ice: An overview

Barrette

2011

Cold Regions Science and Technology

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Eccentric impact of an ice feature: linearized model

Cited by 17 publications

References 6 publications

Modeling iceberg‐rafted sedimentation in high‐latitude fjord environments

Modeling iceberg‐rafted sedimentation in high‐latitude fjord environments

Maximum Impact Force of Woody Debris on Floodplain Structures

Offshore pipeline protection against seabed gouging by ice: An overview

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