Determination of Inverse Depths Using Direct Boussinesq Modeling

This paper presents a technique to reconstruct bathymetry using two snapshots of water surface elevations and velocities as data. A Boussinesq model initialized with the data from the first snapshot is used as the engine to compute wave evolution over test bathymetries, which are iterated until a be...

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Bibliographic Details
Published in:Journal of waterway, port, coastal, and ocean engineering port, coastal, and ocean engineering, 2000-07, Vol.126 (4), p.206-214
Main Authors: Kennedy, A. B, Dalrymple, R. A, Kirby, J. T, Chen, Q
Format: Article
Language:English
Subjects:
Applied sciences
Bathymetry
Boussinesq equations
Buildings. Public works
Coastal oceanography, estuaries. Regional oceanography
Earth, ocean, space
Exact sciences and technology
External geophysics
Hydraulic constructions
Marine
Numerical models
Physics of the oceans
Rip currents
TECHNICAL PAPERS
Water waves
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Summary:This paper presents a technique to reconstruct bathymetry using two snapshots of water surface elevations and velocities as data. A Boussinesq model initialized with the data from the first snapshot is used as the engine to compute wave evolution over test bathymetries, which are iterated until a best fit is reached with the second snapshot. Phase speed difference in computed and measured data is used as the basis for updating bathymetry at each iteration. A novel technique is used to minimize the effect of mismatches between velocity and surface elevation, which could otherwise result in significant errors in phase speed estimates. The inversion algorithm is found to reconstruct bathymetries well for a variety of test cases. A particular strength of the methodology is the ability to account consistently for strong, unsteady currents while constructing the inverse bathymetry.
ISSN:0733-950X
1943-5460
DOI:10.1061/(ASCE)0733-950X(2000)126:4(206)