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STUDY ON MESH REFINEMENT INDEXES FOR TIDE-INDUCED RESIDUAL CURRENTS IN AN ENCLOSED BAY

  • TANAKA Yoji
    横浜国立大学 大学院都市イノベーション研究院
  • OKAZAKI Kohei
    横浜国立大学 大学院都市イノベーション学府
  • SASAKI Jun
    東京大学 大学院新領域創成科学研究科

Bibliographic Information

Other Title
  • 閉鎖性内湾における残差流に着目したメッシュ細分化指標の検討

Abstract

 It is of great significance to consider local mesh refinement for enhancing the efficiency in numerical computation of tide-induced residual currents in an enclosed bay. The objectives of the present study are thus to propose a mesh refinement index that is useful for determining local areas where finer mesh should be adopted. We performed a series of numerical simulation using several types of mesh with different horizontal resolution of 400m, 800m and 1600m, respectively, in Ise Bay. Computational results of all the adopted mesh systems are basically consistent with field measurements. However, computational results of local residual currents around straits were rather sensitive to the adopted horizontal mesh size, which indicated the importance of adopting local mesh refinement. Thus we proposed mesh refinement indexes in terms of the horizontal gradient of depths and residual currents. Through the comparison of estimated errors of residual currents, we concluded that the mesh refinemnt index using the horizontal gradient of residual currents is more appropriate on the basis of statistical analysis with the value of the coefficient of determination being 0.48.

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Details

  • CRID
    1390282680328668928
  • NII Article ID
    130004961696
  • DOI
    10.2208/jscejoe.69.i_1246
  • ISSN
    21854688
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • KAKEN

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