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Enhanced Movements of Sands off the Saemangeum Dyke by an Interplay of Dyke Construction and Winter Monsoon

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タイトル: Enhanced Movements of Sands off the Saemangeum Dyke by an Interplay of Dyke Construction and Winter Monsoon
著者: Lee, Hee Jun
発行日: 2010年
引用: Coastal Environmental and Ecosystem Issues of the East China Sea ,pp.49-70; 2010
抄録: The sandy nearshore areas off sectors I and II of the Saemangeum Dyke were investigated to unravel the effects of the dyke and winter monsoon on the sand movements accelerated southward during 2003.2006. The sands had covered rapidly much of the otherwise muddy seabed during only 3 years, an unusual phenomenon in natural environments on the western coastal region of Korea. Although current measurements with a benthic tripod (TISDOS) show a residual current flowing southward, these alone could hardly transport the seabed sands. During winter, northerly or northwesterly winds should induce wind-generated currents that add hydrodynamic energy strong enough to move sands as bedload to the tidal currents. The areal increase in gravel occurrences within the original sand deposit suggests that the hydraulically equivalent sand grains were selectively transported south with coarser materials left behind. The dyke emplacement is inferred to modify tidal regime to create southward flowing residual currents. However, the sand transport may have been virtually hindered with remarkably weakened tidal currents since the closing of the opening gaps in April 2006. In summary, the combination of the dyke and winter monsoon resulted in a fast expansion of seabed sands, an extraordinary process rarely found in the natural nearshore environments far from any estuary.
記述: Nagasaki University Major Research Project: Restoration of Marine Environment and Resources in East Asia
キーワード: sediment transport / surface sediment / bathymetry / macrotidal / monsoon / winter wave / Saemangeum Dyke / Yellow Sea
URI: http://hdl.handle.net/10069/23501
ISBN: 9784887041516
権利: © by TERRAPUB and Nagasaki University, 2010.
資料タイプ: Research Paper
原稿種類: publisher
出現コレクション:220 研究報告書

引用URI : http://hdl.handle.net/10069/23501



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