Artikel - A Seawall Design with a Revetment and the Wave Reflector to Protect Coast and Maintain the Position of Maron Coast Line Semarang - Retno Tri Nalarsih

Coastal areas is a very strategic location and has a high economic value due to the transition
between land and water. However, it also causes a lot of problems. Semarang is a city in Indonesia, located
on the north coast of Java. This research was conducted in Maron Beach as the location of the research object.
Longshore sediment transport the which cause silting, sedimenttaion, abrasion and erosion can change the
coastline. Therefore, the main reason being to conduct research on coastal protection. This study is a sea wall
design using water depth 40 cm, 30 °slope of the sea wall, curved reflector Compared with two different
wave is 1Hd and 1.5 Hd on it. The result of the selection of materials between wood and concrete, concrete is
more stable against big waves used. Test results on a slope of 30 °curved 10cm (model A ) and a slope of
30 ° curved 15cm (model B ), that is capable of reducing the model B is evidenced by the large wave
reflection coefficient ( Kr ) is smaller than the model A is 0.199.
Keywords: Wave, Seawall, Curve.