Two Dimensional Wavelet Coefficient Statistics for Sea Bottom Classification

Mass transport close to the sea bottom is investigated for simple harmonic waves around a body with a small horizontal dimension. For gravity waves it is shown that the mass transport very near the bottom points towards a convex corner, but near the top of the boundary layer its direction reverses. Possible implications for silting near a pile and a harbour entrance are discussed and some experimental evidence given. For tides, the Coriolis force introduces a spiralling variation within the boundary layer, and possible inferences for coastline modification are drawn.

Download Full-text

PIECEWISE CONSTANT WAVELETS ON TRIANGULATIONS OBTAINED BY 1-3 SPLITTING

International Journal of Wavelets Multiresolution and Information Processing ◽

10.1142/s0219691308002318 ◽

2008 ◽

Vol 06 (02) ◽

pp. 209-222 ◽

Cited By ~ 6

Author(s):

DANIELA ROŞCA

Keyword(s):

Wavelet Coefficient ◽

Dimensional Sphere ◽

Two Dimensional ◽

Piecewise Constant ◽

Planar Triangulation ◽

Numerical Example ◽

Spherical Data ◽

Refinement Process ◽

Two Parameters

We construct piecewise constant wavelets on a bounded planar triangulation, the refinement process consisting of dividing each triangle into three triangles having the same area. Thus, the wavelets depend on two parameters linked by a certain relation. We perform a compression and try to compare different norms of the compression error, when one wavelet coefficient is canceled. Finally, we show how this construction can be moved on to the two-dimensional sphere and sphere-like surfaces, avoiding the distortions around the poles, which occur in other approaches. As numerical example, we perform a compression of some spherical data and calculate some norms of the compression error for different compression rates. The main advantage is the orthogonality and sparsity of the decomposition and reconstruction matrices.

Download Full-text

A wavelet‐coefficient score for comparison of two‐dimensional climatic‐data fields

Quarterly Journal of the Royal Meteorological Society ◽

10.1002/qj.261 ◽

2008 ◽

Vol 134 (633) ◽

pp. 941-955 ◽

Cited By ~ 8

Author(s):

V. N. Livina ◽

N. R. Edwards ◽

S. Goswami ◽

T. M. Lenton

Keyword(s):

Wavelet Coefficient ◽

Climatic Data ◽

Two Dimensional

Download Full-text

Regular Wave Experiments for Twin Circular Submerged Floating Tunnel Tethered to Sea Bottom

Volume 7B: Ocean Engineering ◽

10.1115/omae2017-61154 ◽

2017 ◽

Author(s):

Sang-Ho Oh ◽

Woo Sun Park

Keyword(s):

Hydrodynamic Performance ◽

Hydrodynamic Characteristics ◽

Two Dimensional ◽

Wave Loading ◽

Regular Waves ◽

Wave Flume ◽

Sea Bottom ◽

Physical Experiments ◽

Tensile Forces ◽

Submerged Floating Tunnel

Assessment of hydrodynamic performance of submerged floating tunnel (SFT) under wave loading is one of important factor in the design of the structure. In this study, physical experiments were conducted in a two-dimensional wave flume to investigate hydrodynamic characteristics of a twin circular SFT model under the action of regular waves having different heights and periods. Five different configurations of the twin SFT model was tested in the experiment. The experimental results showed that the three-degree motions of the twin SFT and the associated tensile forces on the tension legs greatly vary with the configurations of the model. It was found that the CD0 configurations are most adequate for satisfactorily restricting the horizontal and vertical motions of the SFT model.

Download Full-text