Erosion and accretion processes in a muddy dissipative coast, the Chao Phraya River delta, Thailand

Katsuto Uehara, Pramot Sojisuporn, Yoshiki Saito, Thanawat Jarupongsakul

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Seasonal variation in seabed elevation in the muddy intertidal zone of the Chao Phraya River delta, an area of serious coastal erosion for 40 years, was assessed using information on waves and tides predicted by numerical simulations. The study area is under the influence of the Southeast Asian monsoon climate and lies in the innermost part of a sheltered gulf, across which a low-gradient slope has developed. Observations, aimed at evaluating the effectiveness of a prototype breakwater on mitigating coastal erosion, indicated that the seasonal variation in the seabed elevation, typically about 30-cm, was caused primarily by seasonal changes in wave direction and height. The breakwater seems to have contributed to a net rise in the seabed level at sites behind the structure. Seabed erosion was most apparent during the northeast monsoon, when waves are weak. Erosion under this low wave energy state was attributed to the combined effect of wave breaking and the low tidal level. A difference in the observed seabed accretion rate between the transitional intermonsoon period and the succeeding southwest monsoon period was attributed to the direction of the wave energy flux; offshore sediments seem to have been supplied efficiently to the study area by waves during the transitional period. Another potential cause of seabed erosion and accretion during the wet southwest monsoon season was the discharge of water and sediments from local canals associated with intense tropical rainfall; this discharge seems to be linked to land use in the coastal area. The results of this study show the importance of monitoring across-shore sediment transport for better understanding of coastal erosion processes.

    Original languageEnglish
    Pages (from-to)1701-1711
    Number of pages11
    JournalEarth Surface Processes and Landforms
    Volume35
    Issue number14
    DOIs
    Publication statusPublished - Nov 1 2010

    Fingerprint

    Thailand
    coastal erosion
    erosion
    monsoon
    river
    accretion
    breakwater
    coast
    wave energy
    seasonal variation
    wave direction
    wave breaking
    wave height
    energy flux
    intertidal environment
    sediment
    energy
    canal
    sediment transport
    tide

    All Science Journal Classification (ASJC) codes

    • Geography, Planning and Development
    • Earth-Surface Processes
    • Earth and Planetary Sciences (miscellaneous)

    Cite this

    Erosion and accretion processes in a muddy dissipative coast, the Chao Phraya River delta, Thailand. / Uehara, Katsuto; Sojisuporn, Pramot; Saito, Yoshiki; Jarupongsakul, Thanawat.

    In: Earth Surface Processes and Landforms, Vol. 35, No. 14, 01.11.2010, p. 1701-1711.

    Research output: Contribution to journalArticle

    Uehara, Katsuto ; Sojisuporn, Pramot ; Saito, Yoshiki ; Jarupongsakul, Thanawat. / Erosion and accretion processes in a muddy dissipative coast, the Chao Phraya River delta, Thailand. In: Earth Surface Processes and Landforms. 2010 ; Vol. 35, No. 14. pp. 1701-1711.
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