Analysis of the Maximum Average Wave Distribution Map in the Southern Waters of Java Island during the Period 2010-2021

This study aims to establish the times and seasons when the average maximum wave height occurs as well as the distribution of the average maximum wave height in the southern waters of Java Island. This study was analyzing the map of the distribution of maximum average wave height in the southern waters of Java Island. The study was conducted in Department of Physics, Udayana University, and Indonesian Agency of Meteorology, Climatology, and Geophysics (BMKG) Tunggul Wulung Meteorology Station Cilacap, between January 2023 and February 2023. Data on daily maximum wave heights in the southern seas of Java Island, with coordinate limits of 7°S to 12°S and 106°E to 112°E, were collected from January 2010 to December 2021 at 00, 06, 12 and 18 UTC. Microsoft Excel was used to compute the data, which was then organized by time and season. A map showing the distribution of maximum average wave height was produced using Surfer software after the maximum average wave height data was displayed. The highest maximum wave height was found in the South Indian Ocean from West Java to East Java, the southern waters of Sukabumi-Garut West Java, and the lowest in the southern waters of Pangandaran-Yogyakarta.The highest average maximum wave height occurred during the East wind season (June, July, and August). The average maximum wave height of 4-5 meters occurred in the southern Indian Ocean of West Java-East Java, 3.5-4 meters in the southern waters of Sukabumi-Cianjur West Java, 2-3 meters in the waters of Garut-Pangandaran West Java, and 1-2 meters in the southern waters of Yogyakarta. During the West wind season (December, January, and February), the average maximum wave heights are 3-3.5 meters in the waters of the southern Indian Ocean from West Java to East Java, 2.5-3 meters in the southern waters of Sukabumi to Cianjur in West Java, 1.5-2.5 meters in the southern waters of Garut to Pangandaran in West Java to East Java, and 1-1.5 meters in the southern waters of Yogyakarta. The highest wave height occurred at 18.00 UTC for Transition season I, East wind season, and Transition season II. In the West wind season, the highest wave height occurred at 12.00 UTC. The highest maximum average wave height occurred during the East Wind season. The map of the distribution of maximum average wave height can be used as a consideration for predicting the maximum wave height in the southern waters of Java Island and becomes descriptive information about the distribution of maximum wave heights in the southern waters of Java Island, which is highly needed as a reference for all marine activities.