Tidal modification and its effect on sluice-gate outflow after completion of the Saemangeum dike,South Korea |
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| Authors: | Seok Lee Heung-Jae Lie Kyu-Min Song Cheol-Ho Cho Eun-Pyo Lim |
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| Institution: | (1) Korea Ocean Research and Development Institute, P.O. Box 29, Ansan, 425-600, Korea |
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| Abstract: | This study examined tidal modification and change in tidal currents caused by the construction of the Saemangeum dike, based
on field observations and a numerical model. The Saemangeum dike was completed in April 2006, enclosing an estuarine area
along the mid-western coast of South Korea. After closure of the dike, the tidal range outside the dike decreased slightly
but significantly, while the inside tidal range decreased drastically. The numerical model results show that the dike construction
has influenced tidal energy propagation and the tidal system in the Yellow Sea. The tidal current speed near the dike decreased
abruptly following closure of the dike, except in front of the sluice gates. Since completion of the dike, outflow water discharged
from the sluice gates has longer residence times due to the weakened tidal current; the change in the tidal current field
has also caused greater northward expansion of outflow water. The sluice gates release fresher water, which spreads over the
sea surface mainly by inertial momentum near the gate; this water is then gradually mixed with sea water farther from the
gate. The less saline, possibly more contaminated outflow impacts the marine environment near the Saemangeum dike. Controlling
the discharge and gate-opening timing can partially mitigate these impacts on the marine environment. |
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| Keywords: | Gate outflow numerical model Saemangeum dike tide tidal current tidal modification Yellow Sea |
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