1

headland bay beach and headland control

H. K. Chang

Coastal Engineering, 57, 76-240, 2010.

2

Bay shape台東金樽海岸 :

3

Bay shape宜蘭內埤海岸 :

4

Bay shape廣東雙月灣海岸 :

5

Definition

6

Definition

7

Empirical function

Coastal Engineering, 57, 124-131, 2010

Yasso (1965)— Logarithmic Spiral bay equation

8

Empirical function

Hsu and Evans (1989)– Parabolic bay equation

27cases of 14 prototypes and 13 model bays

9

Parabolic bay equation

10

Parabolic bay equationGozanles and Medina (1997)–

11

Empirical function

Noreno and Kraus (1999)--Hyperbolic tangent bay equation

12

Definition

13

Examples

14

Examples

15

Examples

16

Examples

17

Examples

18

Uncertainty Coastal Engineering, 57, 132-151-, 2010.

22 volunteers

Bins

m=5.4

19

Uncertainty Standard deviation:

20

Uncertainty Coastal Engineering, 57, 132-151-, 2010.

21

Uncertainty

22

Uncertainty

23

Uncertainty

24

Further investigation Coastal Engineering, 57, 194-,202 2010.

β/θ=1,R=R0

Tan and Chiew (1994)

Derivative R w.r.t. β/θ →slope (tan β)

25

Further investigation Coastal Engineering, 57, 213-,226, 2010.

26

Further investigation EMPBAY:

27

Further investigation Coastal Engineering, 57, 227-,240, 2010.

28

Further investigation

29

Further investigation

30

Further investigation

31

Further investigation

32

Further investigation

33

Further investigation Coastal Engineering, 57, 194-,202 2010.

34

Further investigation Coastal Engineering, 57, 194-,202 2010.