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http://dx.doi.org/10.5657/KFAS.2021.0480

Modeling Variation in Residence Time Response to Freshwater Discharge in Gangjin Bay, Korea  

Kim, Jin Ho (South Sea Fisheries Research Institute, National Institute of Fishery Science)
Park, Sung-Eun (Marine Environment Research Division, National Institute of Fishery Science)
Lee, Won-Chan (Marine Environment Research Division, National Institute of Fishery Science)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.54, no.4, 2021 , pp. 480-488 More about this Journal
Abstract
The term residence time is defined as the time taken for substances in a system to leave the system and is a useful concept to explain the physical environment characteristics of a coastal area. It is important to know the spatial characteristics of the residence time to understand the behavioral properties of pollutants generated in a marine system. In this study, the spatial distribution of average residence time was calculated for Gangjin Bay, Korea, using a hydrodynamic model including a particle tracking module. The results showed that the average residence time was about 10 days at the surface layer and about 20 days at the bottom layer. Spatially, this was the longest residence time in the southwestern sea. There was no significant difference in average residence time at the surface layer due to freshwater discharge, but spatial variation at the bottom layer was larger. The average residence time at the bottom layer decreased in the southwestern area due to freshwater discharge and increased in the northern area. This result suggests that the residence time of anthropogenic pollutants may have a large spatial difference depending on the freshwater discharge, and thus the time taken to influence cultured organisms may also vary.
Keywords
Residence time; Freshwater discharge; Vertical variation; Particle tracking model;
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