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Author: search.filters.author.Unyapoti, PidokSubject: search.filters.subject.Mathematical model

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    A Shoreline Evolution Model With the Wavelength Effect of Breaking Waves on Groin Structures
    (2022-01-01)
    Unyapoti, Pidok
    ;
    Pochai, Nopparat
    Local sea level rise, strong wave action, and tidal currents all wear down or carry away rocks, soil, and sand along the beaches. The quantity of beach areas has decreased as a result of this issue. Analyzing the progression of the shoreline can help us better understand how the beach will look in the future. A groin structure was built to stop beach erosion and repair the beach. Beach erosion and beach deposition research requires a qualitative analysis of the model shoreline behavior in connection to the governing process. Models for shoreline evolution are the subject of some research. However, they focus on the shoreline evolution in an area between a couple of groin structures. The investigated area of shoreline evolution with a pair of groin structures is enlarged in this research to include the groin system and surrounding area. A more realistic shoreline evolution model has been presented, which takes into account the wavelength influence of breaking waves on groin constructions. The initial condition setting approach and boundary conditions techniques, as well as various groin structural impacts, are discussed. A wave crest impact model and five wavelength effects of breaking waves are introduced. Each year, the coastline evolution is approximated using the classical forward-time centered-space method and the unconditionally stable Saulyev finite differential methods. The estimated impacts of shoreline evolution were consistent with the wave crest impact model for five case wavelengths. For assessing long coastline evolution, the numerical models presented enable a reasonable simulation. The efficiency of building a groin system on a nearby beach might be predicted using the proposed modeling.
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    A shoreline evolution model with a groin structure under non-uniform breaking wave crest impact
    (2021-04-01)
    Unyapoti, Pidok
    ;
    Pochai, Nopparat
    Beach erosion is a natural phenomenon that is not compensated by depositing fresh material on the shoreline while transporting sand away from the shoreline. There are three phenomena that have a serious influence on the coastal structure, such as increases in flooding, accretion, and water levels. In addition, the prediction of coastal evolution is used to investigate the topography of the beach. In this research, we present a one-dimensional mathematical model of shoreline evolution, and the parameters that influence this model are described on a monthly basis over a period of one year. Consideration is given to the wave crest impact model for evaluating the impact of the wave crest at that stage. It focuses on the evolution of the shoreline in environments where groins are installed on both sides. The initial and boundary condition setting techniques are proposed by the groins and their environmental parameters. The non-uniform influence of the crest of the breaking wave is so often considered. We then used the traditional forward time centered space technique and the Saulyev finite difference technique to estimate the monthly evolution of the shoreline for each year.
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    A shoreline evolution model with a twin groins structure using unconditionally stable explicit finite difference techniques
    (2021-01-01)
    Unyapoti, Pidok
    ;
    Pochai, Nopparat
    Beach erosion is a natural process that occurs when conveying sediment away from the shoreline is not balanced by depositing new material on the shoreline. This is a problem that is causing beach areas to decline. To avoid beach erosion and flooding, a sea wall and groin have been built. Shoreline evolution prediction is used to investigate the beach topography in the future. There are three phenomena give a large effect to the coastal structure such as the erosion, the accretion and the water level changes. To investigate of beach erosion and beach deposition is needed qualitative understanding of idealized shoreline response to the governing process. In this research, we introduce a governing equation of a one-dimensional shoreline evolution model when a couple of groins is added. The introduced model is a transient one-line model. The manipulation of physical parameters for the model is introduced. The setting method of the initial condition and the boundary conditions techniques when a couple of groin structure effect are also proposed. The traditional forward time centered space method and the unconditionally stable Saulyev finite difference methods are employed to approximate the incremental model in each year. The proposed numerical models give practically simulation for long-term shoreline evolution investigation. The proposed simulation can be used to predict the efficiency of a groin system construction in a local beach. The model is a tool for environment impact assessment of a installing groin structure project.