Article
 

Bathymetry correction using an adjoint component of a coupled nearshore wave-circulation model: Tests with synthetic velocity data

Öffentlich Deposited

Herunterladbarer Inhalt

PDF Herunterladen
https://ir.library.oregonstate.edu/concern/articles/qf85ng77x

Descriptions

Attribute NameValues
Creator
Abstract
  • The impact of assimilation of wave-averaged flow velocities on the bathymetric correction is studied in tests with synthetic (model-generated) data using tangent-linear and adjoint components of a one-way coupled nearshore wave-circulation model. Weakly and strongly nonlinear regimes are considered, featuring energetic unsteady along-beach flows responding to time-independent wave-averaged forcing due to breaking waves. It is found that assimilation of time-averaged velocities on a regular grid (mimicking an array of remotely sensed data) provides sensible corrections to bathymetry. Even though the wave data are not assimilated, flow velocity assimilation utilizes adjoint components of both the circulation and wave models. The representer formalism allows separating contributions of these two components to the bathymetric correction. In a test case considered, involving a beach with an alongshore varying bar, the adjoint wave model contribution was mainly to determine the cross-shore position of the bar crest. The adjoint circulation model provided an additional contribution, mostly adding to alongshore variability in the shape of the bar. The array mode analysis reveals that there are very few modes that can be effectively corrected, given the assumed data error level. Bathymetry perturbations associated with these modes are a mixture of near-coast intensified modes as well as modes extending their influence to deep water (along the background wave characteristics). Additional tests show the utility of different observational arrays in providing the bathymetric correction.
  • Keywords: nearshore processes, coupled wave-circulation model, variational data assimilation, bathymetry estimate
Resource Type
DOI
Date Available
Date Issued
Citation
  • Kurapov, A. L., & Özkan‐Haller, H. T. (2013). Bathymetry correction using an adjoint component of a coupled nearshore wave‐circulation model: Tests with synthetic velocity data. Journal of Geophysical Research: Oceans, 118(9), 4673-4688. doi:10.1002/jgrc.20306
Journal Title
Journal Volume
  • 118
Journal Issue/Number
  • 9
Urheberrechts-Erklärung
Funding Statement (additional comments about funding)
  • This work was supported by the Office of Naval Research under research grant N00014-10-1–0932.
Publisher
Peer Reviewed
Language
Replaces

Beziehungen

Parents:

This work has no parents.

Artikel

Miniaturansicht Titel Hochladedatum Sichtbarkeit Aktionen
file details KurapovAlexanderCEOASBathymetryCorrectionUsing.pdf 2017-10-27 Öffentlich Herunterladen