Sand wave migration predictor based on shape information


Knaapen, M.A.F. (2005) Sand wave migration predictor based on shape information Journal of Geophysical Research, 110, (F4), F04S11. (doi:10.1029/2004JF000195).

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Description/Abstract

Migration of offshore seabed waves, which endangers the stability of pipelines and communication cables, is hard to measure. The migration rates are small compared to the measurement errors. Here, sand wave migration rates are determined from the change in the crest position deduced from long time series of bathymetric echo-sounding data. The crests are identified as local extremes in a bathymetric profile, after low-pass filtering. This approach is applied to both 2-dimensional data and to profiles along pipelines. A consistent migration rate of several meters per year is found. A strong correlation between the sand wave shape and the migration rate is translated in a migration predictor. The predictor assumes that the sand waves migrate in the direction of the steepest slope, following a quadratic relation with the asymmetry. Furthermore it is included that longer waves travel faster but higher waves travel slower. The predictor is calibrated against data from nine areas and validated using three additional areas. An error analysis using markers shows that the error of the predictor is small compared to the noise in the individual crest position observations.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1029/2004JF000195
ISSNs: 0148-0227 (print)
Keywords: seabed dynamics, sandwaves, data analysis, prediction, dune migration, North sea
Subjects:
ePrint ID: 25098
Date :
Date Event
2005Published
Date Deposited: 04 Apr 2006
Last Modified: 16 Apr 2017 22:38
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/25098

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