KAJIAN KARAKTERISTIK GELOMBANG PECAH DI PANTAI AMAL BARU (STUDI KASUS : PANTAI AMAL BARU TARAKAN TIMUR KOTA TARAKAN).
Amal Baru beach is a coastline that has great potential as a tourist area. Based on direct observation, it has been undertaking a lot of physical changes (damage) in the coastal area. This damage is caused by coastal dynamics processes such as heavy abrasion which has caused a bad impact and raises concerns for a coastal residents. Consequently, it is necessary to have knowledge on the characteristics of the waves occured on the coastline in the development and security of coastal areas and the protection of the sorrounding community. In the study analysis was conducted by using Airy Theory, the data analysis approach employed the airstream data from BMKG Juwata Tarakan. The result of the analysis of wave transformation for 10 years (2010-2019) at Amal Baru Beach obtainend the dominant wind direction from east to west; the fetch length is 224,589 m; breaking wave height ranges from 0.8 m - 2.4 m and breaking wave depth range from 0.38 m - 2.1 m. Ased on the results of analysis, at maximum wind conditions, average winds, and highly occured winds; the speeds of land breeze blowing beetwen 3.5 m/s - 15 m/s, sea wind speeds blowing beetwen 5 m/s - 19 m/s, Wind waves Forecasting Significant height (H) beetwen 0.9 m - 4.8 m, Period (T) beetwen 5.5 s - 10.2 s, Duration (D) beetwen 9 hours - 11 hours. Thus, the result of Analysis for Wave Height (H) is beetwen 0.8 m - 2.8 m, the Depth of Breaking Wave (Hb) is beetwen 0.3 m - 2.1 m, and the angle of incidence of the wave is 8° - 30°. Therefore, it concluded that the wave height generated during the maximum wind speed conditions and hightly occured wind speed is a destructive wave (waves which damage the coastline).