An Alternative Design Approach for Detached Breakwater Projects

1993

1990

Cooperation between the authors has led to a number of papers on main design parameters for berm breakwaters. These were the recession at the berm of a berm breakwater for assumed design conditions and main armour rock class, as well as the functional behaviour (wave overtopping and reflection), where often allowable overtopping rates determine the crest height of the structure. They also gave guidance on how some geometrical aspects may influence the recession. For example a flatter down slope, a higher berm level and a higher toe level all decrease the expected recession. Expected recession and expected wave overtopping (or requested crest height) are only two parameters that influence the design of the cross-section of a berm breakwater. In order to design a complete cross-section many more design decisions have to be taken into account. In the past clear design rules on determining a full cross-section of a berm breakwater were lacking and design was based on the experience with earlier designs (in Iceland and Norway) or simply on good reasoning and then testing the structure in a hydraulic laboratory. This paper gives guidance on all relevant geometrical design parameters.

2001

Journal of Marine Science and Engineering

Erosion processes threaten the economy, the environment and the ecosystem of coastal areas. In addition, human action can significantly affect the characteristics of the soil and the landscape of the shoreline. In this context, pursuing environmental sustainability is of paramount importance in solving environmental degradation of coastal areas worldwide, with particular reference to the design of complex engineering structures. Among all the measures conceived to protect the shoreline, environmentally friendly interventions should be supported by the stakeholders and tested by means of mathematical models, in order to evaluate their effectiveness in coastal protection through the evaluation of wave damping and bedload. This study focuses on protected nourishments, as strategic interventions aimed to counteract coastal erosion without affecting the environment. Here, we develop a simplified method to provide a preliminary assessment of the efficiency of submerged breakwaters in redu...

Proceedings of the 9th international conference organised by the Institution of Civil Engineers and held in Edinburgh on 16 to 18 September 2009, 2010

RILEM Bookseries, 2021

Coastal areas are an apprized environment by society that will continue to expand rapidly. Traditional coastal protection structures are commonly deployed to protect coastal areas endangered by natural extreme weather events. However, due to their limited efficiency and very high costs, more efficient and sustainable strategies to deal with coastal erosion are imperative. This research work focuses on the assessment of engineering solutions to mitigate and delay coastal erosion. Three different structure geometries (triangular prism shape, single detached breakwater and group of two detached breakwaters) are analysed on a realistic bathymetry, using a combination of numerical models (SWAN and XBeach) to study the influence of those structures on the coastal hydro-and morphodynamics. SWAN was used for hydrodynamics and XBeach for hydrodynamics and morphodynamics assessments. In addition, a comparison between SWAN and XBeach hydrodynamics results was also performed. Structures considered in this study have regular shaped geometries, and are characterized in terms of their efficiency regarding wave height and wave energy dissipation considering different wave regimes and performance in terms of longterm beach morphodynamic impact (sediments accumulation and erosion). The analysis is concentrated in two scenarios, one for low and the other for highly energetic hydrodynamics (the most challenging to coastal zones defence). The obtained results allowed classifying their performance in terms of the impact on wave energy and wave height dissipation, and sediment erosion/deposition patterns.

The objective of this paper is to bring some international perspectives on the policy, design, construction, and monitoring aspects of Coastal Structures in general, and whenever possible, to present some comparison (or reasons for differences) between the experiences of various countries and/or geographical regions.

SCIREA Journal of Hydraulic Engineering, 2021

Beyond the boundary and design criteria of Low Crested Breakwater (LCB), the success of LCB applications largely depends on the layout of the breakwater installation. The configuration of LCB includes vertical and horizontal positioning. Vertical layout related to the peak elevation position of the structure to the sea level, both to Mean Sea Level (MSL) and High Water level (HWL). Horizontal layout connected with LCB installation related to the optimal distance from the shoreline, the length of the structure, and the width of the gap between LCBs. These three parameters determine sediment volume accumulated behind LCB. This paper presents a summary of field experiences that is expected to be useful for the development of LCB as one of the methods of coastal protection. The objective of developing LCB structure is to make LCB concept as preferred coastal structure that is applicable to all types of materials commonly used for coastal protection.

International Journal of Engineering Research and Technology (IJERT), 2021

https://www.ijert.org/design-of-coastal-structures-for-the-protection-of-ponnani-coast https://www.ijert.org/research/design-of-coastal-structures-for-the-protection-of-ponnani-coast-IJERTV10IS060323.pdf As an effect of sea water rise and storm surges caused by the global climate change, the coasts are subjected to rapid erosion along with anthropogenic activities. Severe erosion leads to land loss flooding and building loss. In this paper we are designing a seawall as well as an offshore breakwater at the Ponnani coast situated in Malappuram district of Kerala to prevent further coastal erosion which happened due to various factors involving coastal hydrodynamics, storm surge as well as due to the effect of the cyclone Ockhi. The effect of rising sea levels, frequent storm surge, frequently occurring cyclones have eroded the coast drastically up to 15m according to the data collected for the past few years. As a measure of beach management, these coastal structures of appropriate length were designed after collecting adequate wave data and tidal data from various sources. The sea wall is designed according to the Engineering Manual 1110-2-1614 for the length of 2100m.The cross section of the sea wall is designed using AUTOCAD. The sea wall is generally designed to consist of three layers that are core, secondary layer and an armour layer. For beach restoration adequate breakwaters were also designed.