Wave Simulation in River Estuary Pekalongan, Central Java, Indonesia Nazariano R. Wahyudi1, S. Imam Wahyudi2 , Fatkhu Husni3
1Oceanography Dept., Diponegoro University, Tembalang, Semarang, Indonesia 2Civil Eng., Dept, Sultan Agung Islamic University, Jl. Raya Kaligawe KM 4, Semarang, Indonesia 3Studi Teknik Consultant, Jl. Badak V-22, Semarang, Indonesia
Pekalongan River has two functions for fishing boat transportation and also the main drainage of Pekalongan City. The Pekalongan river estuary has Jetty located on two sides of the river mouth. The jetty used to protect to wave and sediment. The Pekalongan river had upstreams flow from Kupang and Banger river. Because of the flood incident around 2003, Since 2014, the two river became one estuary. This condition has a negative impact of sediment at the river mouth. So that the research aims to find solutions by simulating waves, currents and sediments. In this paper the focus is about the wave simulation. This research method begins with the collection of primary data in the form of bathymetry measurements at the river mouth. While the secondary data is wind data for 13 years and tidal. Calculations generated from wave forecasting are the results of a significant high value of 1.38 m and a significant period of 4.80 seconds. For wave simulations, SMS software is used with the CGWave module. Based on the results of the simulation, the wave propagation movement results when the dominant wave direction comes from the northwest, north and east. The simulation results can be used to analyze the movement of sediment transport that is affected by the movement of waves around the river mouth.
Keywords: estuary, wave, modelling
Topic: International Symposium of Civil, Environmental, and Infrastructure Engineering