Influence of Reclamation Works on the Marine Environment in a Semi-Enclosed Bay

• Published in: Journal of Ocean University of China Vol. 5; no. 3; pp. 219 - 227
• Main Authors: Ock, Lee M., Jin, Park S., Soon, Kang T.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 30.07.2006; Chonnan National University, Republic of Korea%Geosystem Research Corp., Republic of Korea
• Subjects: Dredging; Flow pattern; Influence; Marine environment; Mathematical models; Reclamation; Seawater; Wind; 开垦工作; 海水交换率; 海洋环境; seawater exchange rate; reclaiming; wind forcing; dredging; random walk method; semi-enclosed bay
• ISSN: 1672-5182; 1993-5021; 1672-5174
• DOI: 10.1007/s11802-006-0005-2

The flow and seawater exchange rates have been predicted using a two-dimensional numerical model and a Lagrangian method for a semi-enclosed shallow bay where reclaiming and dredging works are scheduled. The wind effect on the flow and material transport has been emphasized, and a thirty-year mean value of wind has been considered in the numerical simulation. As a whole, even after the reclaiming and dredging are conducted, the flow pattern looks similar to the original state. However, velocity variations up to 20% to 100% appear in the vicinity of the construction area. In the case of summcr wind forcing, the seawater exchange rate increases from 71.6% to 82.9% after the reclaiming and dredging, as indicated by a particle-tracking method. On the contrary, in the case of winter wind forcing, thc seawater cxchange rate appears to be 97.2% under natural conditions but decrcases slightly to 93.2% aftcr the rcclaiming and dredging. Thus, the wind forcing plays an important role in controlling the seawater exchangc rates. The seawater cxchange rate is further improved by 15% if the dredging is simultaneously carried out with the reclaiming. This suggests that the dredging can be an effective means to mitigate the variation of flow.