Study on Current and Water Quality Characteristics in Yongil Bay

J. Ocean Eng. Technol. 2001;15(4):28-33.

영일만내의 유동과 수질특성에 관한 연구

김헌덕,김종인,류청로

포항종합제철(주) 환경안전부,부경대학교 해양공학과,부경대학교 해양공학과

Keywords: Water level difference, Water quality characteristics, Numerical experiment, 3-D baroclinic model, Current characteristics

핵심용어: 수위차, 수질특성수치실험, 3차원 밀도류모델, 유동특성

Abstract

The water quality in Yongil Bay is getting worse due to the sewage and the waste water from the surrounding industrial complex. The study aims to simulate the current system that is necessary to build ecosystem model for the optium water quality control and clarify the correlation of current system characteristics with water quality in Yongil Bay. To clarify the characteristics of coastal water movement system and verify the applicability of the 3-D model, the current system was simulated using 3-D model baroclinic model which considers tidal current and density effects. As the results of numerical experiments, it is proved the 3-D model is the most applicable on appearing the current system of the stratificated Yongil Bay difference of density. Form the results of simulation considered tidal current only, it can be clarified that the water body flows in the inner bay through the bottom layer and flows out the outer bay through the surface layer in Yongil Bay. And the fresh water from the Hyongsan river and the thermal discharge form POSCO have a little effect on the current system in Yongil Bay, but the diffusion of heat and salt has an important effect upon the formation of the density stratification of the water quality distribution is closely related with the current structure characteristics as well as the tidal residual current system in Yongil Bay.