VARIASI DAN TREN JANGKA PANJANG (1988–2011) ENERGI GELOMBANG DI PERAIRAN SELATAN JAWA DAN BARAT SUMATRA MENGGUNAKAN MODEL SIMULATING WAVES NEARSHORE (SWAN)

• Main Author: Mahiru Rizal, Ardian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/44797
• Institution: Institut Teknologi Bandung

This study explores to reveal the characteristic (variability and climatic long term trend) of The West Sumatra and South Java Sea Significant Wave Height (SWH) and wave power density for the period 1988–2011 using hindcasting data from Simulating WAve Nearshore (SWAN). The wind data input is coming from Cross-Calibrated Multi-Platform (CCMP) with grid resolution 0.25°×0.25°. Unstructured grid is implemented in the model for better flexibility rather than nesting method. Results show that (1) significant wave height output from simulation gives good agreement with buoy and satelite observation in Indonesian inner sea. Verification result at the main study region is not as good as Indonesian inner sea result because the size of the model domain does not include incoming swell from high latitude area, (2) highest seasonal mean of significant wave height and wave power density occuring in JJA, (3) West Sumatra and South Java Sea generally exhibits an increasing trend in SWH 1.04 cm/year and wave power density 94.6 W/m/year. (4) there is a noticeable great potential of SWH and wave power density in South of west Sumatranean waters and West of South Java Sea with average SWH of 1.21 m and wave power density of 4.42 kW/m, The trend of SWH and wave power density in this region also exhibits a significant increasing trend with value of SWH is 1.39 cm/year and wave Power density trend 0.10 [(kW/m)/year], (5) El Ni????????o Phenomenon can decrease the average value of significant wave height and wave power density in study area, (6) the increasing wind speed trend is possibly happened because the duration of the research is coincide with transition time from warm phase to cold phase in Pasific Decadal Oscillation (PDO) index, (7) there is an increasing of SWH and wave power density in most part of West Sumatra and South Java Sea with the most noticeable trend occuring in DJF and MAM rather than JJA and SON.