| The thermal discharge from the power plant will affect the receiving water to some extent in physics, chemistry, biology, and so on, especially harmful to the fish and marine lives in the adjacent water area. To estimate the thermal pollution, the key is to study the thermal distribution and describe the isotherm. In this paper, the Zhanjiang power plant has been cited, and two representative marine lives of Zhanjiang bay chosen to be subjects: Tilapia nilotica and Penaeus orientalis. The study experimentalizes firstly thermal effect of the two marine lives under controllable conditions in laboratory. Meanwhile, numerical simulation has been applied to draw the isotherm of thermal discharge. Based on characteristics of Zhanjiang Bay, a 2-D numerical model of temperature diffusion equation for simulating the flow and heat transport of power plant thermal discharge is established. Then assessment on thermal discharge to aquiculture has been made.The results show that endurance of the two marine lives to high temperature under controllable conditions increases with domestication temperature generally. When the domestication temperature mounts some degree, the UILT50 value will be close to some one (UUILT50). From the 2-D numerical model of temperature equation, combined with current characteristics of Zhanjiang Bay, 2-D numerical model of temperature diffusion equation has been used and the coverage of thermal discharge simulated and the corresponding isotherm of thermal discharge gained. Compared on-the-spot survey results with that, rule of that is close to the trend of which as a whole. The simulated coverage of thermal discharge has been integrated into the received UUILT50 values of the two marine lives. It is concluded that the results of this study suggests that the excess tempature of thermal discharge from Zhanjiang power plant isn't more than 4°C and the direct impact on the Tilapia nilotica and Penaeus orientalis is not in evidence.
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