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Enhanced Exchange Flow During Spring Tide and Its Cause in the Sumjin River Estuary, Korea

  • Eun-Byeol Cho
  • Yang-Ki ChoEmail author
  • Jongkyu Kim
Special Issue: Climate Change and Anthropogenic Change around Korean Peninsula
  • 26 Downloads

Abstract

Knowledge of exchange flow and its variations is important, because it determines the distribution of salt, nutrient, pollutant, and suspended sediment in estuaries. Although exchange flow has been studied extensively, their variations over the spring–neap tidal cycle remain unclear. Many studies have indicated that the exchange flow is weaker during spring tides than neap tides, but others have reported that it might be stronger during spring tides. Therefore, we investigated the spring–neap variation of an exchange flow and its cause based on intensive observational data and an analytical model applied to the Sumjin River estuary (SRE), Korea. The observations revealed that exchange flow increased during the spring tide but decreased during the neap tide. The horizontal salinity gradient increased about seven times more during spring tide than during neap tide in the middle of the estuary. The analytical model implied that the exchange flow in the SRE is mainly driven by the horizontal salinity gradient. The large horizontal salinity gradient and tidal current amplitude ratio in the SRE between the spring and neap tides suggests that the horizontal pressure gradient driven by the salinity gradient overwhelms vertical mixing in driving exchange flow in the SRE.

Keywords

Exchange flow Salinity gradient Sumjin River estuary Tide 

Notes

Acknowledgments

This research was a part of the project titled “Long-term change of structure and function in marine ecosystems of Korea,” funded by the Ministry of Oceans and Fisheries, Korea.

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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  1. 1.School of Earth and Environmental Sciences/Research Institute of OceanographySeoul National UniversitySeoulRepublic of Korea
  2. 2.Department of Naval Architecture and Ocean EngineeringChonnam National UniversityYeosuRepublic of Korea

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