The development of high-resolution wave model in the Indonesia^s Inner Seas: Sunda Strait sea-state during Dahlia Tropical Cyclone event
Muhamad Farid Geonova (a*), S R Adiprabowo (a), A Rahman (a), S Prasetyo (a), A Ramdhani (a), A P Widyani (b), A Amalya (b), E Prasetyo (a)

a)Agency for Meteorology Climatology and Geophysics (BMKG), Indonesia. Jl. Angkasa 1 No.2, RT.1/RW.10, Gn. Sahari Sel., Kec. Kemayoran, Kota Jakarta Pusat, Daerah Khusus Ibukota Jakarta 10610
*muhamad.geonova[at]bmkg.go.id

b)Department of Oceanography, Diponegoro University, Indonesia. Jl. Prof. Sudarto No.13, Tembalang, Kec. Tembalang, Kota Semarang, Jawa Tengah 50275

Abstract

The accurate representation of wind waves is crucial for shipping safety, understanding coastal dynamics, assessing coastal vulnerability, and supporting various marine activities. Various efforts have been made in understanding and predicting the ocean wave condition through numerical modeling. In this study, we present the development and application of a high-resolution (~1km) wind wave model using the SWAN (Simulating Waves Nearshore) model for the Sunda Strait, Indonesia during the Tropical Cyclone Dahlia event in 2017. Our focus is on investigating the impact of Tropical Cyclone Dahlia on local wave conditions. The Sunda Strait, located between Java and Sumatra, plays a vital role in maritime transportation, coastal infrastructure, and coastal ecosystems. Accurate wave forecasts in this region are essential for ensuring safe navigation, coastal management, and disaster preparedness. We employ the SWAN model, a third-generation wave model, capable of simulating wind wave spectra under varying environmental conditions. High-resolution input data, including atmospheric reanalysis for wind fields and bathymetric data, are utilized to drive the model. We present a thorough analysis of the wave characteristics, including significant wave height, wave direction, and wave period, during the passage of Tropical Cyclone Dahlia. The high-resolution wind wave model, based on SWAN, exhibits excellent performance in simulating wave conditions in the Sunda Strait, Indonesia. The study provides essential information on the impact of Tropical Cyclone Dahlia on the local wave condition especially in Sunda Strait, also contributing to the improvement of early warning systems, coastal management and disaster preparedness efforts.

Keywords: high-resolution model, wind-wave, tropical cyclone, extreme events

Topic: Ocean-Atmosphere Dynamics