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International Journal of Coastal and Offshore Engineering، جلد ۱۰، شماره ۳، صفحات ۳۰-۴۳
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عنوان انگلیسی Coupled SWAN-ROMS Numerical Modeling of Nearshore Hydrodynamics and Rip Current Formation Along the Southern Caspian Sea
چکیده انگلیسی مقاله Understanding and modeling coastal currents are crucial for assessing coastal hazards, mitigating human risks, and minimizing structural damage. The southern Caspian Sea, with its diverse geomorphology, variable climatic conditions, and dynamic coastal processes, serves as a key region for the development of various coastal currents. Statistical analyses of drowning incidents in coastal cities indicate that nearshore currents, particularly rip currents, are among the primary contributors to coastal hazards. These currents, which include longshore currents, rip currents, and undertow, are primarily generated by wave breaking in shallow coastal zones. This study aims to identify high-risk coastal areas where specific wave conditions contribute to the formation of strong rip currents, posing significant threats to swimmers and coastal safety. To achieve this, a coupled numerical modeling framework integrating the SWAN (Simulating WAves Nearshore) and ROMS (Regional Ocean Modeling System) models was employed to simulate nearshore current dynamics in four key coastal regions: Nowshahr, Chaboksar, Anzali, and Talesh, located along the southern Caspian Sea. Wind field data were obtained from the ERA5 reanalysis dataset, while boundary conditions were derived from SWAN simulations performed on a mesoscale grid covering the entire Caspian Sea. The results indicate that under prevailing hydrodynamic conditions, longshore currents dominate across all study sites, with rip currents forming in specific localized areas. The orientation of longshore currents is primarily controlled by wind-driven wave propagation patterns, exhibiting an eastward direction in Nowshahr and Chaboksar, while flowing westward in Anzali and Gisum Forest coastal zones. Furthermore, the spatial variability in coastal bathymetry, both alongshore and cross-shore, significantly influences the extent and intensity of these currents, as observed through drifter trajectories. The maximum recorded current velocities range between 0.7 and 1.1 m/s, highlighting the potential hazard posed by these currents in nearshore environments. These findings provide a scientific basis for improving coastal safety measures, informing hazard mitigation strategies, and enhancing numerical modeling frameworks for rip current prediction in the Caspian Sea region.
کلیدواژه‌های انگلیسی مقاله Wave-induced currents,Coastal hazards,Simulation,SWAN,Caspian
نویسندگان مقاله Mahmood Reza Akbarpour Jannat |
Iranian National Institute for Oceanography and Atmospheric Science (INIOAS)

نشانی اینترنتی https://www.ijcoe.org/article_232477_6b486dcb3b068c2f930ede27f85a6934.pdf
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