Wave height

About: Wave height is a research topic. Over the lifetime, 5920 publications have been published within this topic receiving 100257 citations.

Wave Dissipation by Vegetation

Abstract: Flooding resulting from hurricanes and other extreme storm events is a prominent risk along the coasts. These coastal areas are typically of low elevation and relief,making land and infrastructure highly susceptible to inundation by storm surge and waves. These verity of this threat is exacerbated by sea level rise and a possible increase in storm frequency and strength due to climate change. Although hard protection structures such as levees and flood walls reduce flood risk, these structures may fail when storm conditions exceed the design threshold. There is a general consensus that wetlands, which often serve as transition zones between open water and dry land, could act as buffers and reduce storm surge and propagatingwaves substantially before they encounter coastal development. Unfortunately, the capability of wetlands to serve as protection during extreme storms is not understood fully or well documented; furthermore, water level and wave height reductions by vegetation are studied only in low-energy environments. Nonetheless, these studies present methods to quantify vegetation induced wave attenuation for both modeling and design. This technical note focuses on the damping of propagating water waves by vegetation, but also discusses surge reduction briefly.Although waves may be encountered in freshwater environments(e.g., boat wakes, lake fetch,flood waves, etc.), this review focuses on coastal vegetation and resultant effects on flood and storm damage reduction.

Wave scattering by submerged porous disk

Abstract: Linearized potential wave theory is applied in the present paper to investigate the phenomenon of wave scattering by a submerged porous disk. By means of the eigenfunction expansion method, harmonic expressions of the velocity potential in terms of unknown constants are obtained in two subregions of the domain by taking into account the boundary conditions on the free surface, the porous disk surface, and sea bottom surface, as well as the Sommerfeld condition at infinity. These unknown constants are then determined by the matching conditions. Variation of the wave height around the disk and the wave load on the disk versus the dimensionless disk radius, the relative water depth, and the porous-effect parameter is discussed. It is found that the wave scattering by a disk includes a process of focusing wave energy near the rear of the disk for small dimensionless porous-effect parameters. An increase of the dimensionless porous-effect parameter decreases the wave height, and the behavior of a porous disk is similar to that of a wave absorber that may lead to \Isetdown\N for a large disk radius.

Wave Dissipation Across Intertidal Surfaces in the Wash Tidal Inlet, Eastern England

Abstract: Despite the recognition that intertidal surfaces play an important role in dissipating wave height and energy, few previous field measurements have been undertaken to directly quantify this effect. This paper presents the results from a one year data collection campaign in the macrotidal Wash tidal inlet, eastern England, during which wave measurements were taken at lower, mid and upper recording stations along three different shore-perpendicular intertidal transects. It has been found that the intertidal environment of The Wash is effective in dissipating wave height by, on average, 83% and in dissipating wave energy by, on average, 91% with respect to the incident wave conditions. Based upon the results from this study, it is recommended that flood defence management practice in The Wash moves away from focusing on the defence of a structural line towards the management of a defence zone, comprising both natural and structural elements.