Experimental study on dynamic equilibrium of headland-bay beaches

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• 作者：Somruthai Tasaduak ; Sutat Weesakul
• 关键词：Dynamic equilibrium bay (DEB) ; Parabolic bay shape equation (PBSE) ; Headland ; bay beaches (HBB) ; Sediment supply ratio (SSR)
• 刊名：Journal of Coastal Conservation
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：20
• 期：2
• 页码：165-174
• 全文大小：2,750 KB
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• 作者单位：Somruthai Tasaduak (1)
  Sutat Weesakul (2)
  
  1. Water Resources Engineering Department, Faculty of Engineering, Kasetsart University, P.O. box 10903, Paholyothin Rd., Jatujak, BKK, Thailand
  2. Hydro and Agro Informatics Institute, 108, Bangkok Thai Tower Bldg, Rang Nam Rd., Ratch Dhevi, BKK, 12120, Thailand
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Nature Conservation
  
• 出版者：Springer Netherlands
• ISSN：1874-7841

文摘

A dynamic equilibrium bay (DEB) is an embayment with continuous sediment supply and its shoreline planform can remain stable over a long period of time without erosion or accretion. For coastal conservation of sandy headland-bay beaches (HBB), the concept of using a static equilibrium bay (SEB) is well known, but that for DEB has received little attention. Moreover, an empirical equation for the stability of a DEB is not yet available. Experiments on DEB shape that aim to derive new coefficients in the parabolic bay shape equation (PBSE) for DEB are now being conducted in the laboratory. The work commences from an initial artificial HBB in static equilibrium with sediment supply source from the lee of an upcoast headland. A final equilibrium planform is obtained for the condition with a specific wave obliquity and sediment supply rate until no further shoreline change is found. In order to fit the PBSE for a DEB, a new parameter called SSR (sediment supply ratio) that represents the ratio of sediment supply rate from the source and the potential longshore sediment transport rate is introduced to quantify the balance of sediment to the bay. Alternative C coefficients in the PBSE for DEB, which include wave obliquity and the SSR, are then calculated. These new coefficients for DEB can now be used to evaluate the influence of sediment supply from a riverine source on a DEB and to classify its equilibrium status for planning sediment management strategies in coastal conservation.