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Author: search.filters.author.Yamamoto, YoshimichiSubject: search.filters.subject.Numerical model

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    Item type:Publication,
    Examination of coastal erosion prevention in the back of the gulf of Thailand
    (2013-09-16)
    Charusrojthanadech, Nunthawath
    ;
    Rattanarama, Puangpet
    ;
    Yamamoto, Yoshimichi
    The present work presents the effect of bamboo piles and geotextile bag structures on coastal erosion prevention. Simulations were performed to evaluate the wave transmission ratio and the erosion prevention effectiveness of the bamboo piles and geotextile bag using the numerical model of Ca, V. T. (2007), which has shown adequate accuracy in Yamamoto et al.s (2012). The study is the application of an advanced numerical model called Nearshore Wave Dynamics and Bottom Topography Change Simulation System (NWBSS), which is based on Boussinesq approximation equations for near-shore wave transformation and the continuity equation with a Crank-Nicholson scheme and Volume Of Fluid (VOF) technique. The numerical results of the prevention effectiveness in the case of the 43.75m wide bamboo pile wall are almost identical to those of the geotextile bag. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE).
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    Topographical change prediction of the beach or the seabed in the front of a coastal structure
    (2012-09-17)
    Yamamoto, Yoshimichi
    ;
    Charusrojtanadech, Nunthawath
    ;
    Sirikaew, Uba
    Since the beach in the front of a coastal dike or seawall is a useful wave absorber as well as a crucial part of a tourist resort, it is important to maintain a desired beach plane form and profile. In this study we use field data to examine the accuracy of several formulas commonly used to predict the vertical profile of a beach. Second, we similarly check the accuracy of a numerical scour prediction model by Ca et al. (2002). On the design of a beach profile, Sunamura's (1984), Yamamoto's et al., and Dean's formula show good agreement with data. Field verification simulations clarify that wave scouring amount can be accurately predicted using the numerical model of Ca et al. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).