Beach Profile Changes Due to Low Crested Breakwaters at Sigandu Beach, Central Java

Sigandu is a coastal tourism area, which is located in the coastal zone of Batang District. Central Java Province. This coastal area faces severe coastal erosion problem. It is indicated that erosion processes are occurred due to the jetty construction of Batang Commercial Port. This construction cause disturbance of longshore transport equilibrium. The objective of jetty construction is to trap the sediment, however, the classical problem of erosion and accration take place in a short time, soon after the jetty construction finished. The local government of Batang District becomes aware because of this erosion problem. Commenced on September 2014, the Marine and Fisheries Affair initiates the solution by applying low-crested breakwaters structures using geotextile tube. One month after the tube installation, rapid sedimentation occurred by the formation of salients and tombolos behind the structures. Beach profile calculation have been carried out through the series of monitoring and cross section measurement as well as visual observation. This paper presents results of monitoring beach activities. The case study is expected to be an example and applied for other coastal areas having similar coastal problems.