Process-based modelling of morphological response to submerged breakwaters

Submerged breakwaters (SBWs) are becoming increasingly popular as alternative coastal defence system due to the lack of impact on beach amenity and aesthetics compared to common emerged beach protection measures. However, the recent significant amount of failing SBWs resulting in additional shoreline erosion reported in [Ranasinghe and Turner...

Modelling nourishments through the Durban piers: Research of sediment transport and surf conditions

The Durban bight has a very dynamic and variable coastline which is constantly under attack by the Indian Ocean. To protect the Durban harbour from this energetic ocean, already in 1855 breakwaters have been constructed to protect the harbour and prevent sedimentation inside. The construction of these breakwaters and eventually extending these...

Low frequency wave resonance on fringing reefs

Reef systems have been estimated to exist along approximately 80% of the world’s coastlines with living coral reefs, relic limestone platforms and submerged rock formations being the most common types observed. The processes of wave breaking on a reef crest, setup on a reef and flow over and within a lagoon, have been the primary focus of...

Experimenteel onderzoek naar het effect van Ground Consolidators op golven (Anome)

Onderzoek uitgevoerd in het Laboratorium voor Vloeistofmechanica van de TU Delft van 9 november tot 18 december 2009. Dit rapport bevat de meetresultaten en conclusies van proeven met GC’s (Ground Consolidators) die zijn uitgevoerd in november en december 2009 in het Laboratorium voor Vloeistofmechanica van de TU Delft. Het doel van de proeven...

Hydrodynamics of Lagoon Fringed by a Coral Reef

Coral reefs are highly diverse ecosystems that provide food, income, and coastal protection for hundreds of millions of coastal dwellers. They are found in tropical and semi tropical areas spread throughout South-east Asia, the Caribbean, the Indonesian archipelago, on Australian coasts and in the Pacific islands. Coral reefs are subject to both...

Improving surfing conditions with floating wave filters

The sport of surfing has increased tremendously in popularity in the last decade and surf breaks around the world are progressively getting overcrowded with surfers. This overcrowding is an annoyance to surfers themselves since surfing is an individualistic sport, one wave for one surfer. This coastal problem has been addressed by science...

Morphological impact of a deep water reef

For local protection of coastal stretches where buildings are situated in or form part of the coastal defense line the deep water reef concept has been developed. Two reef concepts were designed; a shore-parallel breakwater (of 3 km length) and a segmented breakwater (three blinds of 1 km length), both located in 10 m water depth at 1.5 km off...

Rip currents: A laboratory study of a rip current in the presence of a submerged reef

Detailed laboratory measurements of the wave and current field induced by bi-chromatic waves incident on an artificial surfing reef are presented. Strong wave focussing occurs on the surfing reef. Both PTV and in-situ measurements are reported that show the presence of a strong rip current flowing oblique off-shore. Observed water level set-up...

Wave attenuation by artificial reefs

This paper intends to demonstrate the applications of artificial reefs to a broader readership concentrating on examples in coastal protection. In Germany, artificial reefs are not widely used as a coastal protection measure probably due to limited knowledge of the potential of this kind of structures. Reefs are not intended to ensure total...

Perched beach with submerged breakwater as a solution for the shore protection of Maasvlakte II

This new land will be exposed to a North Sea wave climate and tidal currents. Severe erosion of the dunes and a large draw back of the coastline has to be avoided. One of the possibilities to influence the wave climate and thus the sediment transport nearshore is by using a perched beach with a submerged breakwater (see Figures A2 and A3). The...

Beach Nourishment and Artificial Surf Reef

Balneário Camboriú is a very touristy city in southern Brazil, situated in the five kilometer wide Camboriú Bay. Its main tourist attraction is the beach, which is 5800 m long and rather narrow with a dry width of 10 to 20 m. The city is facing several problems regarding the beach that have a negative impact on tourism. The main problems are:...

Modelling the effects of submerged breakwaters in a wave basin: 2DH simulations of tests with Delft2D-MOR

This report is the result of a master thesis ofthe author, student at Delft University ofTechnology, Faculty of Civil Engineering. In this report a simulation oftests with submerged breakwaters, parallel to the shoreline, in a wave basin, are carried out with the morphodynamic model Delft2D-MOR. This 2-dimensional horizontal model was developed...

Effect of submerged breakwaters on a beach profile exposed to regular waves in a wave basin

In the framework of a Human Capital and Mobility Project called "Dynamics of Beaches, experiments with the aim of solving unknown aspects of submerged breakwaters have been carried out by six European universities. Agreements were made considering the layout of the breakwater, the wave conditions and the initial bottom profile. This report...

Reef breakwater response to wave attack

A reef breakwater is a low-crested rubble-mound breakwater without the traditional multilayer cross section. This type of breakwater, in essence, is a homogeneous pile of stone with individual stone weights similar to those used in the armour and first underlayer of conventional breakwaters. Because of their high porosity, reef breakwaters are...

THE GROWTH RATE OF STONY CORALS OF BROWARD COUNTY, FLORIDA: EFFECTS FROM PAST BEACH RENOURISHMENT PROJECTS

The skeletal growth of hermatypic (reef-building) corals is a sensitive indicator of environmental conditions and perturbations. In particular, excessive sedimentation and turbidity act to depress coral growth because energy expenditure is required to remove sediment and because turbidity reduces light energy necessary for coral health and...

Wave Attenuation and Wave Set-Up on a Coastal Reef

This study deals with the breaking of waves on coastal reefs, with special emphasis on energy dissipation (wave height attenuation), wave spectrum modification and the characteristics of wave set-up. It has an engineering perspective; its main objective is to provide the practicing engineer with much needed information on the design conditions...

Scrap tire shore protection structures

Design manual for shore protection structures using old rubber tyres. With the use of old car tires one may construct floating breakwaters and reef breakwaters