ABSTRACT
ABSTRACT: Taking CNOOC Tianjin floating LNG project as background, a 3-D numerical model based on the hydrodynamics and advection-diffusion equation is used to simulate the tidal current field and temperature diffusion caused by the cold water emission, the distribution of temperature diffusion is predicted both at surface layer and bottom layer, as well as the envelope area of the maximum temperature reduction and reduction value at the water intake. Calculating results show that: (1) tidal current shows a typical reciprocating characteristic in the project area, it flows toward SW during flooding tide and NE during ebb tide. Besides, current direction at the water outlet pointing to the open sea during the full tide, while it flows along the dyke sometimes at the surface layer, reflecting the 3-D current characteristics; (2) temperature diffusion distributed in a narrow shape, mainly along E-W direction, the diffusion area at surface layer is smaller than bottom layer, the envelop area of temperature reduction more than 0.5 degree is within 4 km2; (3) the maximum temperature reduction value at the water intake is between 0.5 degree and 1.0 degree, and the difference between surface layer and bottom layer is only within 0.1 degree.
