Numerical analysis has been carried out to analyze seawater flow field and power generation characteristics of the tidal current power generation system for various multi channel shroud systems. Geometrical multi channel arrangement largely affects the flow field characteristics in the shroud system which power generation performance through turbine blade depends on. Sectional averaged velocity in front of the turbine blade which increases more than 2 times compared with channel inlet is much influenced as well as the flow from the rear with curl. And flow variation results in high inlet velocity in horizontal arrangements of multi channels with mechanical output of the turbine. These results are expected to be used as applicable data for the development of the tidal power generation system with shrouds.

Numerical analysis has been carried out to investigate seawater flow field characteristics with various current directions near the manganese nodule mining device. Seawater flow near the collecting device is largely influenced by the sea current direction, especially along the downstream of the rear system. Predicted flow velocity distributions are analyzed with turbulent kinetic energy and drag force. There is big flow field variation when the direction angle between the mining device and seawater current flow approaches to 30°~ 120°, and flow velocity along the rear region of 60° becomes faster than 180°. Averaged turbulent kinetic energy at 180° also becomes low, about 57% higher at 60°. These results from the study can be applicable to the optimum design of manganese nodule collecting system in the deep seawater flow.

신항과 낙동강 하구역의 접점인 연결잔교를 통해 소통되는 해수의 수리적인 특성을 파악하기 위하여 연결잔교부에서 현장관측을 실시하고 두 해역간의 상호작용을 해석하고자 하였다. 현장조사 결과로서 연결잔교상의 최대 유속은 1차관측시 13.18 cm/sec, 2차관측시 30.80 cm/sec를 나타내었다. 해수소통량 계산결과는 1차 관측기간 동안 단위시간당 해수소통량은 184.71 m3/sce이고, 잔차해수소통량은 59.74 m3/sec로 신항만에서 낙동강 하구역 방향으로 유출되었다. 또한 2차 관측기간 동안 단위시간당 해수소통량은 331.15 m3/sec이고, 잔차해수소통량은 28.88 m3/sec로 낙동강 하구역에서 신항만 방향으로 유출되었다.