scholarly journals Determination of Submerged Breakwater Location for Coastal Protection in Panjang Island Waters Jepara

2019 ◽  
Vol 4 (5) ◽  
pp. 346-351 ◽  
Author(s):  
Denny Nugroho Sugianto ◽  
Purwanto Purwanto ◽  
Gentur Handoyo ◽  
Aulia Oktaviani ◽  
Kunarso Kunarso ◽  
...  
Keyword(s):  
Coastal Protection ◽  
Submerged Breakwater

Estimate of Storm Induced Beach Erosion Through the ETS Approach

2008 ◽  
Author(s):  
Rosaria E. Musumeci ◽  
Carla Faraci ◽  
Felice Arena ◽  
Enrico Foti
Keyword(s):  
Return Period ◽  
Extreme Events ◽  
Coastal Erosion ◽  
Beach Erosion ◽  
Coastal Protection ◽  
Shoreline Retreat ◽  
Submerged Breakwater ◽  
The One

In the present paper the risk of beach erosion is evaluated by applying the Equivalent Triangular Storm (ETS). The selected case study is ‘La Plaja’ beach located in the South of Catania, Sicily. The proposed approach has shown that when the ETS model is applied, a shoreline retreat has been found which on average overestimates the one obtained by means of actual storm data of about 35%. The model has been applied for the determination of the return period of shoreline recession due to beach erosion during extreme events in order to recover risk maps, which can provide useful information in the planning of coastal interventions. Finally the model has been applied to predict the shoreline retreat in the presence of a submerged breakwater, confirming that the introduction of such coastal protection work strongly limits the risk of coastal erosion.

scholarly journals Evaluating the feasibility and advantage of a multi-purpose submerged breakwater for harbor protection and benthic habitat enhancement at Kahului Commercial Harbor, Hawai‘i: case study

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Yuko Stender ◽  
Michael Foley ◽  
Ku’ulei Rodgers ◽  
Paul Jokiel ◽  
Amarjit Singh
Keyword(s):  
Coral Reef ◽  
Coral Cover ◽  
Ecological Impact ◽  
Coastal Protection ◽  
Benthic Habitat ◽  
Engineering Structures ◽  
Camera System ◽  
Reef Environment ◽  
Submerged Breakwater ◽  
Coral Reef Environment

AbstractConstruction of breakwaters provides an engineering solution for coastal protection. However, little effort has been made toward understanding the ecological impact on local coral reef ecosystems and developing engineering structures that would enhance the coral reef environment. A submerged breakwater proposed for Kahului Commercial Harbor, Hawai‘i, provided an opportunity to design a multi-purpose ‘reef structure’ to mitigate wave impacts while providing new coral reef habitat. This design involved ecological and environmental considerations alongside engineering principles, serving as a model for environmentally sound harbor development. This field study evaluated environmental conditions and reef community composition at the proposed site in a gradient extending outward from the harbor, using in situ data with multivariate analyses. Benthic and topographic features in the area were assessed using a towed drop camera system to relate to biological factors. Results that support breakwater topography should follow the natural spur and groove and depth of the adjacent reef and orient with wave direction. A deep area characterized by unconsolidated substrata and low coral cover would be replaced with the shallow, sloping hard bottom of the breakwater, and provide an exemplary area for corals to flourish while protecting the harbor from large ocean swells. Surfaces on shallow sloping hard bottoms receive higher levels of irradiance that benefits coral growth. Optimal levels of water motion facilitate sediment removal and promote coral recruitment and growth. The design of the Kahului Harbor submerged multi-purpose structure serves as a model for design of shoreline modification that enhances, rather than degrades, the local coral reef environment.

Optimal sinusoidal submerged breakwater for coastal protection

2021 ◽  
Author(s):  
Muh. Fadhel Atras ◽  
Raynaldi Lalang ◽  
Ikha Magdalena
Keyword(s):  
Coastal Protection ◽  
Submerged Breakwater

scholarly journals Coastal protection work for Batu Mejan Beach, Bali

2019 ◽  
Vol 276 ◽  
pp. 04019
Author(s):  
Pujianiki Ni Nyoman ◽  
Astawa Diputra I Gede ◽  
Jayantari Made W ◽  
Mataram INK
Keyword(s):  
Wave Energy ◽  
Protective Layer ◽  
Minimum Cost ◽  
Public Works ◽  
Coastal Protection ◽  
Submerged Breakwater ◽  
The Public ◽  
International Tourist ◽  
Tourism Destinations ◽  
The Cost

Batu Mejan Beach is an international tourist destination located in the Canggu area of Badung regency, Bali. Due to erosion problems of Batu Mejan Beach the local government installed a revetment system to protect the coast. However, the revetment that was built before for the Batu Mejan Beach is currently ineffective and damaged. To determine the parameters for the construction of a new coastal protection system, the wave energy occurring at the site was evaluated initially as part of this study. A Submerged breakwater with a tetrapod for a protective layer was then chosen as the alternative to reduce the wave energy before reaching the shore and to reduce erosion as well as further deterioration of the existing revetment. A Submerged breakwater is suitable in coastal areas that are used as tourism destinations because the submerged breakwater construction is under the water, therefore the beauty of the beach will not be interrupted. Four models were made with variations in the width and elevation of the breakwater peak. The model was selected which has the minimum value of transmission coefficient and minimum cost. The cost budget plan was determined by using the analytical list of the Public Works and Housing Regulations of 2016. From the analysis, a model was selected with a submerged breakwater height of 2.45 m, length of 110 m, distance gap of 55 m, and the budget of IDR 17,861,989,813.

scholarly journals The Submerged Breakwater as Prototype of Coastal Protection in Gili Trawangan, Lombok, Indonesia

2015 ◽  
Vol 125 ◽  
pp. 284-290
Author(s):  
Eko Pradjoko ◽  
Imam Bachtiar ◽  
Nanang Matalatta ◽  
Gatot Sugihartono
Keyword(s):  
Coastal Protection ◽  
Submerged Breakwater

scholarly journals Selection of Appropriate Coastal Protection Structure Using AHP Method

2020 ◽  
Vol 2 (1) ◽  
pp. 4
Author(s):  
Barbara Karleuša ◽  
Nino Krvavica ◽  
Igor Ružić
Keyword(s):  
Coastal Protection ◽  
Analysis Method ◽  
Ahp Method ◽  
Analytic Hierarchy ◽  
Submerged Breakwater ◽  
Criteria Importance ◽  
Hierarchy Process ◽  
North Western ◽  
Selection Of

The selection of an appropriate coastal protection structure using multi-criteria analysis method AHP (analytic hierarchy process) was presented by a case study of a beach reconstruction in the Kostanj Bay (north-western part of Croatia). The newly designed beach (about 300 m long) will be formed on the western part of the bay by the additional filling of the natural rocky coastline with gravel and building reinforced concrete seawalls towards the sea. The beach will be protected by a submerged breakwater. Five different alternatives were analysed and defined by a different design of the protective breakwater. The first alternative, without the submerged breakwater, was considered as the baseline alternative. An additional four alternatives were examined based on four criteria and five sub-criteria, which considered the technical, economic, social and environmental impacts. The sensitivity of the ranking for the considered alternatives was analysed using five criteria importance scenarios.

scholarly journals REFLEKSI GELOMBANG PADA PEMECAH GELOMBANG TENGGELAM BLOK BETON BERKAIT

2018 ◽  
Vol 9 (1) ◽  
pp. 33-42 ◽  
Author(s):  
I Ketut Dharma Setiawan ◽  
Juventus Welly Radianta Ginting
Keyword(s):  
Concrete Block ◽  
Coastal Protection ◽  
Block Type ◽  
Wave Forces ◽  
Research Subject ◽  
Submerged Breakwater ◽  
Experimental Station ◽  
Processing Data ◽  
Wave Generator ◽  
Resource Research

When a large dimension of rock needed for an armored layer of breakwater, the scarcity of it became a major adversity, because of that many research subject of using concrete as a substitute for rock performed. One of the research are the usage of concrete block for submerged breakwater as a method for avoiding a very large concrete block, but still able to withstood wave forces. The key is in the interlocking of each concrete block so it could achieve the desired result with a lesser dimension concrete block. The research was performed in Laboratory of Coastal Experimental Station, Water Resource Research Center, using a 2D channel. The facility used were flume channel, regular wave generator machine, wave dumper, wave probe, and computer for processing data. The experiment indicate that the wave energy attenuation depends on the dimension of interlocking concrete block type submerged breakwater. The dimension represented in the form of relation of the distance of water level to structures crest and the crests width. The breakwater performance of the concrete block is quite useful as an underwater coastal protection building viewed from reflection with a reflection coefficient of 34.7% at (h?d) / h = 0 and the peak width of B = 2.0

scholarly journals Determination of the design parameters of the boundaries of the floodplain of the Terek River based on engineering and hydrological calculations

2021 ◽  
Vol 3 (45) ◽  
pp. 21-21
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Flow Rate ◽  
Water Discharge ◽  
Design Parameters ◽  
Hydraulic Structures ◽  
Coastal Protection ◽  
Construction Design ◽  
River Flood ◽  
Rivers And Lakes ◽  
Measured Water

When using rivers and lakes as communication routes, the shape of the underwater relief should be studied. The irrigation capacity of the rivers is determined by the measured water discharge. The main dimensions of hydraulic structures and the dimensions of water-pass structures on roads and railways depend on the flow rate of water in the river. Consequently, in the construction design of coastal protection structures, information is needed on flows, depths, as well as the corresponding marks of the water surface (levels). Keywords: FLOW RATE, WATER DEPTH, DRAINAGE AREA, ANALOGUE RIVER, COEFFICIENT, RIVER FLOOD

scholarly journals Visualization Investigation of Energy Dissipation Induced by Eddy Currents for a Solitary-Like Wave Passing over Submerged Breakwater Sets

2020 ◽  
Vol 8 (11) ◽  
pp. 834
Author(s):  
Chi-Yu Li ◽  
Ruey-Syan Shih ◽  
Wen-Kai Weng
Keyword(s):  
Eddy Currents ◽  
Particle Image ◽  
Wave Attenuation ◽  
Coastal Protection ◽  
Reflection Coefficients ◽  
Submerged Breakwater ◽  
Transmission And Reflection Coefficients ◽  
Piv Technique ◽  
Image Velocimetry ◽  
Transmission And Reflection

Wave attenuation for the purpose of coastal protection has been an important topic in coastal engineering. Wave attenuation in relation to the vortices induced by a solitary-like wave propagating over submerged breakwaters (BWs) is discussed in this paper. A series of hydraulic model experiments was conducted to investigate the occurrence of eddies, the types and combinations of submerged BWs, and related phenomena of the range expansion of vortices. The microscopic changes in the flow field, the variation of eddies, and the distributions of streamlines were analyzed using the particle image velocimetry (PIV) technique. The measured transmission and reflection coefficients, along with the concept of energy conservation, were also examined to support the results. The results indicate that the attenuated wave energy is related to the induced vortices, and show that the total relative vortex energy for rectangular submerged BWs is larger than that for undulating submerged BWs in both the single and composite sets. The magnitude of the maximum vorticity of the undulating BW sets is larger and more concentrated than that of the rectangular BW sets; however, the total vortex energy is slightly smaller owing to the narrower vortex area range.

scholarly journals NUMERICAL STUDY OF WAVE INTERACTION WITH A SUBMERGED POROUS BREAKWATER IN COMBINATION WITH A FLOATING BREAKWATER

2018 ◽  
pp. 38 ◽  
Author(s):  
Arun Kamath ◽  
Athul Sasikumar ◽  
Hans Bihs
Keyword(s):  
Numerical Study ◽  
Coastal Region ◽  
Wave Interaction ◽  
Coastal Protection ◽  
Cfd Model ◽  
Submerged Breakwater ◽  
Direct Wave ◽  
Floating Breakwater ◽  
Visual Impact ◽  
Rubble Mound Breakwaters

Conventional emerged rubble mound breakwaters are commonly built to protect ports and marinas from direct wave action. With increased high-valued developments in the coastal region, engineers have to design innovative coastal protection structures that can provide adequate harbor tranquility with minimum visual impact. One such solution is the combination of a submerged breakwater with a floating breakwater. In this paper, the open-source CFD model REEF3D (Bihs et al. 2016) is used to simulate wave interaction with a submerged porous breakwater with a floating breakwater on the lee side. The wave interaction with the submerged porous breakwater is validated by comparison with experimental data from Hieu and Tanimoto (2006). The validated model is then used to simulate the wave interaction with a combination of the submerged breakwater and the floating breakwater. The transmission coefficient across the combination is calculated to be about 12.5%, demonstrating the possibility to provide harbor tranquility with minimum visual impact.

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