Applied Study of Hydrodynamic Model on Coastal Area with Mangrove Forest†

The coastal areas play an important role for humans and life, providing economic resources such as fisheries, tourism, and transportation, while also regulating the climate and maintaining biodiversity. As a region with strong interactions of hydrodynamic factors between rivers and the sea, research on coastal areas is essential for maintaining its current state and protecting the coastal areas from erosion, as well as the impacts of climate change and sea‐level rise. Nowadays, with the development of technology and enhanced computing capabilities, the research method using simulation models is widely used. In this study, we have developed a hydrodynamic model that can be applied to calculate and simulate the coastal and mangrove forest areas. The finite volume method combined with the HLL (Harten‐Lax‐van Leer) scheme is used to ensure stability and conservation of the model. The simulation results provide an overview of the hydrodynamic regime in the study area. The characteristics of the water flow in the mangrove forests also illustrate its role in protecting the coastline, reducing erosion, and accumulating sediment, thereby expanding coastal areas. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.