Abstract
ABSTRACT Submarine pipeline is used as a seawater intake system since it is cost effective compared to canal and jetty type intake structures. Open channel type intakes attract large deposition of sediments and hence periodic maintenance dredging is essential. Jetty type seawater intake is generally expensive. Much coastal water around the world hold high concentration of Total Suspended Sediments (TSS) like the coastal waters of Sabiya area, Kuwait in the north western part of Arabian Gulf. The existing seawater intake channel of a power plant is attracting significant settlement of TSS. Maintenance dredging of about 400,000 m25/year is carried out. It is proposed to increase the seawater intake for a proposed 2050 MW additional power plant and hence further increase in the TSS settlement is anticipated, if the present sea water intake system is used. Alternative type of seawater intake system, which can reduce the TSS is explored. Feasibility study is carried out to reduce the sediment entry into the power plant utility. The TSS levels were assessed, and its variations with respect to tidal phase, water depth and elevation along the depth are assessed. The settling velocity of the sediments is assessed. A sea water intake system is designed and the modality of taking water from the inlet and the configurations of the settling tanks are provided. It is advisable to draw water closer to the free water surface using a vertically moving intake well. It is found that the TSS level reduces 40% to 60% when the ambient flow velocity of sea water is minimum. Hence it is beneficial to avoid taking seawater when the sediment carrying capacity of the seawater is high during high currents. This study will be useful for feasibility design of submarine pipeline type intake for similar locations around the world.
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