Wave Numerical Modelling : Study Case in Kawal Estuary, Bintan Island
Reni Wijayanti (a*), Dewi Surinati (a), Risandi Dwi Putra (b), Asep Mulyono (c), Ida Narulita (d), M Rahman Djuwansah (c)

a) Research Center for Oceanography, National Research and Innovation Agency, Jakarta 14430, Indonesia
*reni.wijayanti[at]brin.go.id
b) Naval Architecture Department, Faculty of Engineering, Raja Ali Haji Maritime
University, Tanjungpinang 29411, Indonesia
c) Research Center for Environmental and Clean Technology, National Research and Innovation Agency, Bandung 40135, Indonesia
d) Research Center for Climate and Atmosphere, National Research and Innovation Agency, Bandung 40135, Indonesia

Abstract

The coastal surrounding Kawal river estuary is strategic area with many functions, both socio-economic and abiotic sectors. The study of the physical condition in around this area is lack, one of which is the analysis of wave conditions. Numerical modeling of ocean waves was carried out using the spectral wave (SW) module on the MIKE 21/3 Integrated FM model software for 1 year periods (December 1, 2021-November 30, 2022). This modeling aims to determine the condition of significant waves around the estuary in 4 season (DJF, MAM, JJA and SON). This research was also conducted to find out whether the area around the estuary that has wave energy potential. From the results of the study, we took 5 extraction points that were considered to represent each condition. The modeling results also have a good validation value of 81.69% against naotide tidal data and 85.04% against field data measurements using RCM tools in March 2021. In DJF and MAM, the dominant wave moves from the northeast with the significant wave height reaching 2 m. While in JJA and SON, the dominant wave moves in a northwesterly direction with a greater magnitude, reach more than 3 m at a certain point. The influence of monsoon winds is a major factor in the distribution of wave distribution and other factors.

Keywords: Numerical Modeling- MIKE21 Integrated FM Model- Spectral Wave Module- Significant Wave Height, Kawal Estuary

Topic: Oceanography