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A probabilistic description of pressure ridge width, spacing, and keel depth for the Chukchi and Beaufort seas based on IPS and ADCP observations
Abstract 16 seasons of under-ice measurements, from both the Beaufort and Chukchi seas, were processed and pressure ridge keel features were identified. A starting threshold value of 6m was justified by statistical goodness-of-fit results and used to identify keels from the under-ice measurements. Statistics for keel depth, keel width, keel slope, and keel spacing were determined and compared to other sources. It was shown that the Exponential, Gamma and Weibull Distributions all fit depth data well; with the three-parameter Weibull Distribution being the better fit. Keel width and slope were studied by comparing the most common modal keel width, for each 1m increment of keel depth, and comparing the results to other sources. A presumed keel slope, for an idelaized triangular keel, of 33.7° for the Western Beaufort and 32.5° for the Chukchi seas did not compare well with field measurements from some sources but did compare favorably with published results from models of ridge formation. The disparity could have significant implications when designing offshore structures in ice-covered waters. The best fit found for keel spacing was the Lognormal Distribution, which is consistent with other studies. Parameters for the distributions considered in the paper are provided along with rudimentary statistics for the parameters studied.
Highlights Pressure ridge keel distribution follows a Weibull Distribution. Pressure ridge spacing distribution follows a Lognormal Distribution fairly well. Pressure ridge depth to width ratio is consistent with models but not field measurements. Pressure ridge angle of repose is inconclusive. Statistics for pressure ridges in the Chukchi and Beaufort seas are provided.
A probabilistic description of pressure ridge width, spacing, and keel depth for the Chukchi and Beaufort seas based on IPS and ADCP observations
Abstract 16 seasons of under-ice measurements, from both the Beaufort and Chukchi seas, were processed and pressure ridge keel features were identified. A starting threshold value of 6m was justified by statistical goodness-of-fit results and used to identify keels from the under-ice measurements. Statistics for keel depth, keel width, keel slope, and keel spacing were determined and compared to other sources. It was shown that the Exponential, Gamma and Weibull Distributions all fit depth data well; with the three-parameter Weibull Distribution being the better fit. Keel width and slope were studied by comparing the most common modal keel width, for each 1m increment of keel depth, and comparing the results to other sources. A presumed keel slope, for an idelaized triangular keel, of 33.7° for the Western Beaufort and 32.5° for the Chukchi seas did not compare well with field measurements from some sources but did compare favorably with published results from models of ridge formation. The disparity could have significant implications when designing offshore structures in ice-covered waters. The best fit found for keel spacing was the Lognormal Distribution, which is consistent with other studies. Parameters for the distributions considered in the paper are provided along with rudimentary statistics for the parameters studied.
Highlights Pressure ridge keel distribution follows a Weibull Distribution. Pressure ridge spacing distribution follows a Lognormal Distribution fairly well. Pressure ridge depth to width ratio is consistent with models but not field measurements. Pressure ridge angle of repose is inconclusive. Statistics for pressure ridges in the Chukchi and Beaufort seas are provided.
A probabilistic description of pressure ridge width, spacing, and keel depth for the Chukchi and Beaufort seas based on IPS and ADCP observations
Valenti, Vincent (author) / Mahoney, Andy (author) / Metzger, Andrew (author)
2020-10-05
Article (Journal)
Electronic Resource
English
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