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http://dx.doi.org/10.7850/jkso.2021.26.2.063

Characteristics of Tide-induced Flow and its Effect on Pollutant Patterns Near the Ocean Outfall of Wastewater Treatment Plants in Jeju Island in Late Spring  

KIM, JUN-TECK (Jeju Special Self-Governing Provincial Council)
HONG, JI-SEOK (Department of Earth and Marine Science, College of Ocean Sciences, Jeju National University)
MOON, JAE-HONG (Department of Earth and Marine Science, College of Ocean Sciences, Jeju National University)
KIM, SANG-HYUN (Eco Environmental & Biological Engineering Research Lab)
KIM, TAE-HOON (Department of oceanography, Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
KIM, SOO-KANG (Ocean and Fisheries Research Institute)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.26, no.2, 2021 , pp. 63-81 More about this Journal
Abstract
In this study, we investigated the tide-induced flow patterns near the ocean outfall of the Jeju and Bomok Wastewater Treatment Plants (WTP) in Jeju Island by using measurements of Acoustic Doppler Current Meter (ADCP) and a numerical experiment with inserting passive tracer into a regional ocean model. In late spring of 2018, the ADCP measurements showed that tidal currents dominate the flow patterns as compared to the non-tidal components in the outfall regions. According to harmonic analysis, the dominant type of tides is mixed of diurnal and semi-diurnal but predominantly semidiurnal, showing stronger oscillations in the Jeju WTP than those in the Bomok WTP. The tidal currents oscillate parallel to the isobath in both regions, but the rotating direction is different each other: an anti-clockwise direction in the Jeju WTP and a clockwise in the Bomok WTP. Of particular interest is the finding that the residual current mainly flows toward the coastline across the isobath, especially at the outfall of the Bomok WTP. Our model successfully captures the features of tidal currents observed near the outfall in both regions and indicates possibly high persistent pollutant accumulation along the coasts of Bomok.
Keywords
Wastewater treatment plants; Numerical experiment; Tidal currents; Flow patterns; Harmonic analysis; Residual current; Pollutant accumulation;
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