Abstract

Seasonal characteristics of wave height in Southern Bali waters (SBW) in 2014 was simulated using SWAN (Simulating Wave Nearshore) model with the resolution of 1/216° (0.51 km). The model was forced using Cross Calibrated Multi Purposed (CCMP) wind data with resolution 1/4° (27.75 km) and 1/600° (0.18 km) bathymetry data derived from Batimetri Nasional (BATNAS) provided by Geospatial Information Agency (BIG). The result shows that the highest (lowest) seasonal average of Significant Wave Height (SWH) in the SBW in 2014 during east (west) monsoon or JJA (DJF) in June-July-August (December-January-February) months was about 2.2 m (1.4 m). Meanwhile, SWH during the first (second) transitional monsoon or MAM (SON) in March-April-March (September-October-November) months was about 1.7 m (2.1 m). The 2D spectrum analysis exhibits that seasonal wave characteristic in the study region was dominated by swell propagation from the Indian Ocean (IO) associated with the Gallian Cyclone. Corresponds to the SWH, seasonal average of wave energy spectrum during east monsoon (JJA) shows the highest value up to 0.0038 m2s/deg compared to the other seasons.

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