Physical Model of Natural Coastal Protection System: Wave Transmission Over Mangrove Seedling Trees

Yuanita, Nita; Kurniawan, Alamsyah; Setiawan, Heri; Hasan, Farhan; Khasanah, Millatul

doi:10.2112/si91-036.1

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…The effectiveness of the structure was first analysed by comparing the result of transmission coefficient K t on bare land from our previous study (Yuanita et al, 2019) with transmission coefficient K t for all scenarios in the current study. This is presented in Table 2 and Figure 7.…”

Section: Discussionmentioning

confidence: 99%

“…It was also found that wave height reduction owing to a staggered arrangement of trees was 10% lower than that owing to tandem arrangement. Yuanita et al (2019) carried out a physical model experiment of a natural coastal protection system with a focus on wave transmission over mangrove seedling trees. The results showed that the wave height reduction in areas with mangroves was about two times greater than that on bare land.…”

Section: Review Of the Literaturementioning

confidence: 99%

“…at the same level as the water surface. This crest elevation is considered the most effective based on our previous study (Yuanita et al, 2019).…”

Section: Model Preparationmentioning

confidence: 99%

“…For example, mangrove seedling trees can be damaged by the waves or current before they grow strong enough, and thus require appropriate protection until at least two years after planting. To solve this problem, a natural coastal protection system that combines a main natural protection and temporary manmade structures is proposed (Yuanita et al, 2017;Yuanita et al, 2019). This is illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Physical Model of Natural Coastal Protection System: Geobag-Dyke Performance to Effectiveness of Natural Coastal Protection System

Yuanita¹,

Kurniawan²,

HAKIM³

et al. 2020

J. Sustain. Sci. Manage.

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One of the potential hazards that can cause major problems in coastal areas is erosion. In order to solve this problem, the notion of sustainable coastal development has garnered growing attention around the world. Coastal zone management mechanisms aim to ensure the sustainability of resources and the environment. For example, natural coastal protection using vegetation such as mangrove trees is currently preferred in many places in the world. However, there are challenges in the development of this natural form of coastal protection, e.g. mangrove seedling trees can be damaged by the waves or the current before they grow strong enough, and thus require appropriate protection until at least two years after planting. To solve this problem, a natural coastal protection system that combines a main natural protection and a temporary man-made structure is proposed. After a process of weighing temporary man-made-structure alternatives, the geobag dyke was selected. This study aimed to quantify the effects of various geobag dyke configurations and geobag unit weights on wave height reduction. Laboratory experiments were conducted on a narrow wave flume using a mangrove model as main natural protection and geotextilegeobag models as temporary man-made structures. Various wave conditions were generated during the laboratory tests. This paper focuses on the experimental results of wave transmission through the protection system in order to determine the most effective geobag dyke configuration to reduce the wave height. Based on experimental modelling, the most effective geobag dyke configuration uses relatively heavy geobag units with a moderate dyke slope (1:1.5).

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Section: Discussionmentioning

confidence: 99%

Section: Review Of the Literaturementioning

confidence: 99%

“…at the same level as the water surface. This crest elevation is considered the most effective based on our previous study (Yuanita et al, 2019).…”

Section: Model Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical Model of Natural Coastal Protection System: Geobag-Dyke Performance to Effectiveness of Natural Coastal Protection System

Yuanita¹,

Kurniawan²,

HAKIM³

et al. 2020

J. Sustain. Sci. Manage.

Self Cite

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“…The worst possibility is that residents are forced to move from the area because it is no longer habitable. The coastal protection system right now at Pekalongan coast consisting of geobag and mangroves like proposed by [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of land subsidence effect on coastal sediment transport in Pekalongan

Wijaya

Kurniawan

Yuanita

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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This study examines the condition of sediment transport on the Pekalongan coast by a numerical model computation using the Delft3D Flow module. The research was started by collecting and analysing field data both primary and secondary. Thus, the hydrodynamic and sediment transport model are then calculated in two scenarios which are representing the conditions before (2016) and after (2021) land subsidence by assuming a land subsidence of 10 cm/year. The numerical model is then calibrated and verified on the data of tidal water level elevation and current velocity, the best results are obtained at a chezy number of 60 m0.5/s, and sensitivity tests are carried out on changes in sediment grain size, wave height and wave direction in order to determine the characteristics of the numerical model. The sensitivity analysis of sediment grain size is the most sensitive effect to sediment transport characteristic. The results of the numerical model are then compared based on the scenarios before (2016) and after the occurrence of land subsidence (2021). The results indicate that after land subsidence, the sedimentation rate is increasing by 56.34%, whereas the erosion rate is decreasing by 3.98% after one neap-spring tidal cycle (around 15 days) in the study area.

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Experimental Investigation of Wave Attenuation Using a Hybrid of Polymer-Made Artificial Xbloc Wall and Mangrove Root Models

Sabari

Oates

Akib

2021

Eng

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Rising sea levels, strong wave currents and destructive human activities put coastal areas at risk of erosion and potential flooding. Several countermeasures have been introduced—both artificial and natural—to tackle the issue. This study investigated the effectiveness of the use of hybrid polymer-made artificial Xbloc walls and mangrove root models for protection against water waves. One Xbloc wall was made up of three Xbloc units stacked on top of each other and joined together using water-resistant tape. The artificial models were designed using SolidWorks and AutoCAD software, 3D printed, laser cut and then superglued. The experiment was conducted at Nottingham Trent University Laboratory with a varying combination of single/multiple Xbloc walls and mangrove root models. The change in the wavelength, height, celerity and period was observed for six different model arrangements. The results revealed a successful decrease in the celerity, height and wavelength, as well as the elongation of the wave period (one cycle time). The hybrid arrangement of one Xbloc wall and two mangrove roots provided the best protection, reducing the wavelength, celerity and height by 5.50%, 26.46% and 58.97%, respectively, and also delaying the wave period by 28.34%. The lowest attenuation in the entire wave parameters stated was observed for the arrangement containing only one set of mangrove roots model. Therefore, the wave attenuation using the combined action of 3D printed polymer-made Xbloc walls and mangrove roots was better, because it facilitated the dissipation of wave energy to a greater degree compared to the use of only Xbloc walls or mangrove roots separately.

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Physical Model of Natural Coastal Protection System: Wave Transmission Over Mangrove Seedling Trees

Cited by 4 publications

References 5 publications

Physical Model of Natural Coastal Protection System: Geobag-Dyke Performance to Effectiveness of Natural Coastal Protection System

Physical Model of Natural Coastal Protection System: Geobag-Dyke Performance to Effectiveness of Natural Coastal Protection System

Numerical modelling of land subsidence effect on coastal sediment transport in Pekalongan

Experimental Investigation of Wave Attenuation Using a Hybrid of Polymer-Made Artificial Xbloc Wall and Mangrove Root Models

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