EXPERIMENTAL STUDY ON TOPOGRAPHIC CHANGE OF ARTIFICIAL SHALLOW AND PORE-WATER PRESSURE ON SURFACE LAYER OF ARTIFICIAL SHALLOW

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Other Title
  • 人工浅場の地形変化特性と浅場内部の間隙水圧変動に関する実験的研究

Abstract

 Topographic change of an artificial shallow is investigated experimentally in terms of bottom flow velocity on the surface of the shallow and pore-water pressure on the surface layer of the shallow. Experimental results show that the erosion occurs from the upper part of the slope to the offshore part of the crown, which corresponds to a breaking point judged from the spatial distributions of the wave height and the mean water level. It is also found that the area of the topographic change increases with an incident wave height and an incident wave period. For the shallow composed of fine sediments, a relative vertical effective stress ratio (RVESR) reduces during onshore bottom flow velocity while the RVESR rises during offshore bottom flow velocity, and suggest that offshore sediment transport can be accelerated because it is inferred that restricting force between sediment particles decreases with the increase in the RVESR. Furthermore, it is demonstrated that sediment transport of the shallow can be evaluated reasonably well using a Shields parameter modified to take into account pore-water pressure on the surface layer of the shallow, and consequently it is essential to consider the pore-water pressure when assessing sediment transport and resulting topographic change of the shallow.

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Details 詳細情報について

  • CRID
    1390001205354238976
  • NII Article ID
    130004961445
  • DOI
    10.2208/jscejoe.68.i_1061
  • ISSN
    21854688
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • KAKEN
  • Abstract License Flag
    Disallowed

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