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강윤호(Y.H. Kang),추효상(H.S. Choo),윤양호(Y.H. Yoon),최상덕(S.D. Choi),이병권(B.K. Lee) 한국해양환경·에너지학회 2004 한국해양환경·에너지학회 학술대회논문집 Vol.2004 No.-
Masan and Jinahe bays have been reportedly oxygen deficient and stratified by the combined effects of shallow water depth-topography, semi-enclosed geometry, riverine inflow and weak tidal currents. Field measurements were conducted to inspect distribution of oxygen and density in terms of time-May, 2003 to April, 2004 and space-11 points along the cross section in the water basin. The results showed that density stratification occurred between May and September, 2004. Oxygen deficient layer was found simultaneously over the period at the bottom water. As the water was strongly mixed in vertical direction to break the stratification, DO level was slightly increased > 5 ㎎/L. Nonetheless, DO saturation rate could not meet with the compulsory limits (80 %) of water quality.
강윤호(Y.H. Kang),조기안(K.A. Cho),최상덕(S.D. Choi),추효상(H.S. Chu),김종규(J.K. Kim) 한국해양환경·에너지학회 2005 한국해양환경·에너지학회 학술대회논문집 Vol.2005 No.11
To investigate salinity intrusion along Seomjin river estuary, field measurements and numerical simulation have been carried out. In general, salinity in estuaries depends upon interaction processes of river discharge, tidal range and bathymetry, yielding seasoanl and tidal changes. Salinity was measured at 6 points including Songjeong, Seomjin Br., Dontak, Seornjingang Br., Gwangyang Br. and Taein Br. for spring(9 April 2004), mid(2 October 2(04), neap(28 May 2005) tides, with vessels anchored during 25 hours. Salinity was observed for high water in ranges of 0.7-12.0 PSU at the Seomjin Br. point, 21.9-32.9 PSU at the Gwangyang Br. point and 20.8-29.7 PSU of difference between 2 points. Salinity differecnes for high and low waters were obtained in ranges of 0.3-8.0 and 5.2-9.2 PSU, respectiviely, at the Seomjin Br. and Gwangyang Br. points. Mathematical experiments were undertaken using EFDC(Environmental Fluid Dynamic Computation code). The model was calibrated comparing hydrodynamic and salinity measurements with predictions. The model undershot the maximum level of 12.1 PSU at the Seomjin Br. point, which is possibly due to the inexactness of bathymetry and open boundary conditions. On the other hand, the river maintenance flow of 5.5 m3/s at Songjeong cannot reflect salinity in-situ downstream Hadong and aquatic ecosystem.