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Equilibrium beach

Equilibrium beach

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Equilibrium beach

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  1. Equilibrium beach Chang HsienKuo 國立交通大學土木工程學系 中華民國102年4月11日

  2. Definition of beach morphology 淺化帶 (shoaling zone);碎波帶 (surf zone);沖刷帶 (swash zone) ; 灘線 (shore line);海灘 (shore , beach);海岸 (coast);平台 (berm); 內灘 (inshore);外灘 (offshore);沙洲 (bar);灘面 (beach face);灘崖 (beach scarp); 台梯 (step) ;沙谷 (trough)

  3. Type of beach profile Definition: 平衡海灘斷面 (equilibrium beach profile):在同一波浪條件長期作用下,海灘斷面將呈現平衡之狀態。 Type of beach: Type A:暴風海灘 (storm beach) 或冬季海灘 (winter beach) Type B:中間型海灘 (transition beach) Type C:正常海灘 (normal beach) 或夏季海灘 (summer beach) Sunamura andHorikawa , 1974

  4. Slope of beachface Sunamura(1984) tan f

  5. Classification of beach profile SunamuraandHorikawa (1974) Experiment: 4-8 Field:9-18

  6. Equilibrium beach: theory Dean (1977)

  7. Brunn-Dean profile:Equilibrium beach: , Moore (1982) Dean(1991) Kriebel et al. (1998) Disadvantages: Infinity slope at shoreline Monotonic function: infinity depth

  8. Other forms of beach profile Bodge (1992) Hsu e al. (1998) Simple form? Theoretical approach? Bar shape profile?

  9. Advanced reference

  10. A and m coefficients of Bruun/Dean profile

  11. A and m coefficients of Bruun/Dean profile

  12. A and m coefficients of Bruun/Dean profile Artcic beach

  13. A and m coefficients of Bruun/Dean profile

  14. Shape parameter

  15. Shape parameter

  16. Shape parameter

  17. Best fitting for a1 a1=03285

  18. Shape parameter

  19. Extended equilibrium beach Larson (1991)

  20. Three-parameter equilibrium profile

  21. Three-parameter equilibrium profile

  22. Three-parameter equilibrium profile

  23. Three-parameter equilibrium profile

  24. Three-parameter equilibrium profile Goodness of fit: overall errors

  25. Validity of equilibrium beach

  26. Validity of equilibrium beach

  27. Reflective natural beaches

  28. Surf profile

  29. Shoaling profile

  30. Comparison with field data

  31. Parameter

  32. Discussion Does an equilibrium beach exist in real beach? What is the application of equilibrium to coast engineering? Theoretical approach ?