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You are here : eLibrary : Ice Research and Engineering : 23rd Symposium USA (2016) : Sea Ice : Experimental Study on the Form Drag of Ice Ridge Keel in Stratified Fluid
Experimental Study on the Form Drag of Ice Ridge Keel in Stratified Fluid
Author : Lu, Peng, Wen Tie, Bo Li, Wan Wu, and Zhijun Li
With the enhanced summer melting of Arctic sea ice, a strong halocline was frequently observed at a shallower water depth (10?20 m) than in past (50 m) especially in the marginal ice zone of the Arctic Ocean. The shallow halocline poses an important impact on the drift of sea ice because ice draft and ridge keel would induce internal waves on the interface of stratified fluid. To include the effect of internal wave on the oceanic drag force into the parameterization of sea ice drag coefficient, a series of laboratory experiments was conducted to study the drag force on ice ridge keel in stratified flows, and combinations of different drift velocity (U) and draft (D) of ice ridge were considered in the tests. The results revealed that comparing with the monotonically increasing drag force with drift velocity in uniform flow, the drag force in stratified flow (F) shows a non-monotonic variation along with the drift velocity. With increasing velocity, a peak of F is firstly achieved and then drops to a valley, and finally increases gradually as that in the uniform flow. The drag coefficient (C) on ridge keel was also calculated based on the drag force measured in the stratified flow. Its value shows a peak as U is nearly half of the phase velocity (U0) of the internal waves on the interface of stratified water, and becomes constant as U>>U0. Proceedings of the 23rd IAHR International Symposium on Ice 1
File Size : 859,782 bytes
File Type : Adobe Acrobat Document
Chapter : Ice Research and Engineering
Category : 23rd Symposium USA (2016)
Article : Sea Ice
Date Published : 20/10/2016
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