The transformation of waves is one of the important subjects in coastal engineering studies. Refraction, diffraction, shoaling, reflection can be analysed with the mild slope equation over mild sloped topographies. But the extended mild slope equation can be applied to the rapidly varying topographies since it includes higher order bottom effects such as square of bottom slope and bottom curvat...

Directing shallow-water waves and their energy is highly desired in many ocean engineering applications. Coastal infrastructures can be protected by reflecting to deep water. Wave harvesting efficiency improved focusing on wave converters. Changing water depth effectively affect celerity therefore the propagation of waves. However, determining spatially varying bathymetry that direct a designed...

In this study, we present a new method called BathySent to retrieve shallow bathymetry from space that is based on the joint measurement of ocean wave celerity (c) and wavelength (λ). We developed work with Sentinel 2 data, exploiting time lag between two spectral bands, acquired quasi-simultaneously, single satellite dataset. Our was linear dispersion law, which related water depth wavelength:...

For homogeneous lossless 3D periodic slabs of fixed arbitrary geometry, we characterize guided modes by means of the eigenvalues associated to a variational formulation. We treat robust modes, which exist for frequencies and wavevectors that admit no propagating Bragg harmonics and therefore persist under perturbations, as well as nonrobust modes, which can disappear under perturbations due to ...

A sudden decrease in water depth, called a negative surge or expansion wave, is characterised by a gentle change in free-surface elevation. Some geophysical applications include the ebb tide flow in macro-tidal estuaries, the rundown of swash waters and the retreating waters after maximum tsunami runup in a river channel. The upstream propagation of expansion waves against an initially steady f...

The present era is distinguished for the development both of physical and psychical wonders. In mechanical and other arts, what miracles have been wrought by the ingenuity and scientific experiments of the engineer and the practical chemist; the tunnelling of iron-stone rocks; the draining of primaeval bogs and mosses; the suspension, as if by magic, of gigantic tubes over the wide waters; the ...

The main objective for the Three Gorges Reservoir is to help control floods and protect Jingjiang Chenglingji regions in middle reach of Yangtze River. Hydrological measurements have demonstrated that character flood propagation Reach has changed significantly since became operational, meaning management must be modified accordingly. To explore effective management, a hydraulic model was develo...