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Author: search.filters.author.Yamamoto, YoshimichiSubject: search.filters.subject.Scour

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    Effect of jetties in coastal change at chumphon estuary
    (2017-01-01)
    Promngam, Atsanupong
    ;
    Charusrojthanadech, Nunthawath
    ;
    Maleesee, Komsan
    ;
    Yamamoto, Yoshimichi
    The research on the effect of coastal facilities for protecting an estuary from channel blockage and a coast from beach erosion by waves demands to understand wave propagation, nearshore current and sediment transportation. The purpose of this research is to study theeffect of jetty and propose countermeasures to compensate insufficient safety in Chumphon estuary, Chumpon province. The field survey is executed, topographic maps, bathymetric data, wave data for storm surges, tidal data were collected and inputted in Ca's numerical model(Ca et. al., 2000). This model consists of the near shore fluid dynamicmodel based on the Boussinesq equation and the topographical change model which the bed load and the suspended load were considered. Although the jetties are very effective for channel maintenance, since diffraction waves by the jetties has drawn sand in the north-side beachof the jetties toward the jetties, serious coastal erosion has occurred in the center of this north-side beach. Moreover, according to thesimulation results by using Ca's model, in the south-side beach of thejetties, if a typhoon of Linda classes hits this area, since heavy overtopping occurs, wave dissipation facilities are necessary.
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    Evaluation method of suction rate of backfilling materials from a coastal dike or a seawall
    (2014-01-01)
    Kuisorn, Wirayut
    ;
    Charusrojthanadech, Nunthawath
    ;
    Yamamoto, Yoshimichi
    Evidence shows that coastal dikes and seawalls could be damaged or destroyed by coastal scours and the suction of backfilling materials. As the impacts of coastal erosion and global warming become severer, it is necessary to be able to predict the suction rate of backfilling materials from underneath a dike or a seawall with sufficient accuracy. Therefore, this research paper proposes a method that can predict the suction rate of backfilling materials from a dike or a seawall. The findings show that the estimates of the suction rate using the proposed method were very similar to the measured field data. This fact indicates that the proposed method can predict the rate of suction with sufficient accuracy. Copyright © 2014 by the International Society of Offshore and Polar Engineers (ISOPE).
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    Improvement of prediction methods of coastal scour and erosion due to tsunami back-flow
    (2010-09-10)
    Ca, Vu Thanh
    ;
    Yamamoto, Yoshimichi
    ;
    Charusrojthanadech, Nunthawath
    The 2004 Indian Ocean tsunami caused large-scale erosion and scour on many coasts. If the coastal scour by the first tsunami wave caused the destruction of a dyke, the second tsunami wave may generate much more serious damage. Therefore, it is necessary to research on the improvement of prediction methods for erosion and scour by tsunami. This paper presents a numerical model for the above mentioned purpose. In the model, the sediment transport due to tsunami is simulated by using user-friendly prediction methods, and considering bed load and suspended load transport. Furthermore, prediction methods on the maximum scour depth and its position at the beach in front of a seawall are also proposed. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).