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NRCEST 國立交通大學土木工程學系 中華民國 102 年 4 月 11 日
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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)
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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 and Horikawa, 1974
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4 Slope of beachface Sunamura (1984) tan f
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5 Classification of beach profile Sunamura and Horikawa (1974) Experiment: 4-8 Field:9-18
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6 Equilibrium beach: theory Dean (1977)
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7 Brunn-Dean profile:Equilibrium beach: Moore (1982), Dean(1991) Disadvantages: 1.Infinity slope at shoreline 2.Monotonic function: infinity depth Kriebel et al. (1998)
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8 Other forms of beach profile Bodge (1992) Hsu e al. (1998) Simple form? Theoretical approach? Bar shape profile?
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9 Advanced reference
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10 A and m coefficients of Bruun/Dean profile
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11 A and m coefficients of Bruun/Dean profile
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12 A and m coefficients of Bruun/Dean profile Artcic beach
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13 A and m coefficients of Bruun/Dean profile
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14 Shape parameter
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15 Shape parameter
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16 Shape parameter
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17 Best fitting for a1 a1=03285
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18 Shape parameter
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19 Extended equilibrium beach Larson (1991)
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20 Three-parameter equilibrium profile
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21 Three-parameter equilibrium profile
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22 Three-parameter equilibrium profile
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23 Three-parameter equilibrium profile
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24 Three-parameter equilibrium profile Goodness of fit: overall errors
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25 Validity of equilibrium beach
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26 Validity of equilibrium beach
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27 Reflective natural beaches
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28 Surf profile
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29 Shoaling profile
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30 Comparison with field data
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31 Parameter
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32 Discussion 1.Does an equilibrium beach exist in real beach? 2.What is the application of equilibrium to coast engineering? 3.Theoretical approach ?
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