Numerical modeling of wave-current interaction in Merak Port, Indonesia

Abstract

Abstract. This study aimed to investigate the effects of currents to wave height in the waters of Merak Port, Banten using wave spectrum model. The wave-current interaction simulation was performed by utilizing SWAN (Simulating Waves Nearshore) in stationary mode and using the unstructured triangular grid. Data of wind velocity and direction as model inputs were obtained from BMKG (Indonesian Agency for Meteorology, Climatology, and Geophysics), whereas tidal current velocity data was obtained from TMD (Tide Model Driver). The model was simulated in two different scenarios, i.e. without and with following (adverse) current which is same (opposite) with wave propagation. The model input of dominant west wind was used to represent the west monsoon, while the dominant wind from the north was used to represent the east monsoon. The simulation results show that the maximum wave height is 2.98 m in the west monsoon and 1.9 m in east monsoon. In the west (east) monsoon the following current decrease wave height to 9.26% (5.09%), while the adverse current increase wave height up to 9.07% (6.56%).

Assessment of reliable wave climate at jetty on open coasts: role of 2D spatio-temporal spectrum

“…Studies carried out by Ho et al (2023) based on field observation and numerical solutions reveal that depending on the frequency of waves, water depth and magnitude of tidal current; when the speed of tidal wave exceeds the celerity of wind waves, even the following tidal current may increase H s by 25% and may also shift the peak period by seconds. Numerical modelling carried out by Nurfitri et al (2017) on the wave-current interaction reveals that when there was an occurrence of following tidal current (0.8 m/s), there was a decrease in significant wave height by about 9.3%, while the opposing current increased wave height up to about 9.1%. As such, in the present study a coupled HD-SW model was used to assess reliable wave climate in macro tide-dominated regions and the accuracy of the simulated wave climate obtained from the coupled model was assessed by comparing with the measured H s and T m01 .…”