해운대 해수욕장의 계절별 표사순환 특성

Abstract

To analyze the incident wave characteristics around the haeundae beach the long-term deep water wave data published by ministry of maritime affairs & fisheries (2002) and the continuous wave observation data for one year at the 20 m of water depth in the front of haeundae beach was used. Wave observation data shows that the prevalent wave direction is SSW-S in Spring and Summer seasons while E-SE in Autumn and Winter. Numerical modeling results show that the waves from E-SE are refracted strongly due to the shoal which developed at the south-east side of haeundae beach. Simulation results shows an inflowing nearshore current along the east coast of the beach which develops strongly in Autumn and Winter. Radioactive isotope tracer experiment results for 155 days indicate that the tracers move to the on-shore direction in the first and second tracking then disperse to the E-W direction along the shore. Sediment transport by waves, wave-induced current and tidal current was calculated using the TRANSPOR2004 and the seasonal sediment budgets for H_(s,max), H_(s,1/3) and H(s,mean), were analyzed. Also, an annual sediment budgets were calculated for the each wave conditions, then the seasonal sediment circulation patterns were deduced in the wide area including haeundae beach. According to the above results, a sediment mainly inflows from the east coast of the beach to the eastward of dongbaek island, where the 80% of inflow sediment transported to the eastward as a longshore sediment while 20% of them going out to the offshore at the center of the beach. Above sediment budget analysis results show a good agreement with the sediment transport trend analysis obtained by Gao model.