Abstract:
From the coastal erosion situation now, using artificial reef is a choice that get attention. Then we
learn about shape of the artificial reef that can decrease the wave force for 4 types. The general ones that
we are using now (type 1, 2) and design for 2 more (type 3, 4). And abbreviate their sizes into 1:15, Bring to
the test in the tank (1.5 depth of fake coral) one at a time and add two more (lined up) put them away
from wave generating device so and 100 cm. Test in 3 level of wave (1) 1.0-1.5, (2) 1.5-2.0, (3) > 2.0 and
note the height of wave before and after passing the artificial reef then calculate height changed percent.
Every experiment, artificial reef type 1-dome shape, can decrease the wave height more than 48 percent
(48.36-62.14 percent). another 3 types, can decrease the wave height less than 33 percent (15.17-33.10 percent). Order from
the most-the least, type 4-octagonal pyramid, type 3-hexagon pyramid, type 2-square. Artificial reef that has
circle shape or likely to circle shape can decrease the height of wave more than another shapes, it's more easily to build and cheaper.