Naslov
Hydraulic Characteristics of Vertical Perforated Sea Wall

Autori
Andročec, Vladimir ; Carević, Dalibor ; Pušić, Velimir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Application of Physical Modelling to Port and Coastal Protection / Damiani ; Leonardo ; Mossa, Michele - Bari : Nuova Bios, 2008, 19-23

ISBN
978-88-6093-046-0

Skup
Second International Conference on the Application of Physical Modelling to Port and Coastal Protection

Mjesto i datum
Bari, Italija, 02.07.2008. - 05.07.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
perforated construction; reflection coefficient; wave force; upper board

Sažetak
Chambers of vertical perforated constructions have an influence on reflection coefficient, respectively on overtopping and ship movement. With specific chamber design and configuration it is possible to influence those characteristics. Demand for small overtopping volume requires higher constructions, however the construction costs are increasing proportionally with the height. Due to that, perforated construction chamber height is a current issue collateral to stability, functionality and expenses. In this paper model experiments are conducted with specific perforated construction with small spacing between water surface elevation and upper board of the perforated construction chamber, which has an influence on wave energy dissipation mechanisms inside the chamber and on reflection characteristics as well. Small spacing between water surface elevation and upper board relative to incident wave height has a negative influence on distribution and relaxation of the pressure, created by waves, in the chambers interior. This paper presents measurements on two models. First model is made in scale 1:25, as vertical partially perforated construction, with vertical longside perforations. Influence of wall porosity on reflection coefficient for regular and irregular waves is analysed in this model. Optimal porosity, which gives the minimum reflection coefficients, for regular waves, is about 30% (figure below). Pressures on the upper board of the construction, for different porosities of the chambers front wall, were measured on the same model. Higher porosities gave larger pressures on the upper board, which was expected, because the higher wall porosity transmits greater portion of wave energy. Second model is made in scale 1:40, as vertical partially perforated construction with vertical longside perforations. In this model pressures are measured with nine gauges, on front perforated wall, on the back wall and on the upper board. Pressures are compared for two cases, when the chamber board has the air gaps and without it. Air gaps decrease forces on the upper board up to 50%. Also, influences of the sea level on pressure in the chamber are analysed and influence of model scale on measured pressures. Relations between certain construction parameters and incident waves are presented, which can be helpfull in optimisation of these types of construction.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

POVEZANOST RADA