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Notes:
Volume 2 Journal of Environmental Research
Page 17
JOINT EVENT
July 26-27, 2018 Rome, Italy
&
6th Edition of International Conference on Water Pollution & Sewage Management
4th International Conference on Pollution Control & Sustainable Environment
Shin’ichi Sakai et al., J Environ Res 2018, Volume: 2
A proposal of objective analysis method on environmental sea temperature for evaluation of warm
water dispersion discharged from power plants
Shin’ichi Sakai, Norikazu Nakashiki, Takaki Tsubono and Yasuo Niida
Central Research Institute of Electric Power Industry, Japan
In Japan thermal and nuclear power plants have been generally constructed in coasts to use a plenty of sea water for a cooling
system of vapor, and warm water is discharged again into the surrounding seas. Then the evaluation of dispersion of warm
water is one of the important issues for an environmental impact assessment (EIA) and for environmental monitoring under
operation of power plants. Therefore the dispersion area of warm water is decided relatively against the environmental sea
temperature as a reference, the decision of environmental sea temperature is essential in the evaluation process. A new analysis
method using an optimal interpolation on environmental sea temperature, which can take account of spatial non-uniformity
of environmental sea temperature, is proposed for the EIA and environmental monitoring of warm water. As the result of
applying the proposed method to the environmental survey data with a thermal power plant where warm water is discharged
as surface buoyant jet, the optimal correlation length, the important parameter of optimal interpolation, is estimated about one
and a half times of maximum distance between observational points. In addition, the enclosed area of 2°C higher dispersion
area of warm water according to the preliminarily prediction based on such as numerical simulations is found to be adequate
criteria for selection of the observational data to be analyzed. Finally, the estimated dispersion area of warm water in the
surface based on the proposed method is certified to be consistent with the result of the EIA.
Biography
Shin’ichi Sakai has and received his Doctor of Engineering degree titled: Study for coastal current analysis with remote sensing data and data assimilation method,
from Kyoto University. He has started the career of Research Scientist at Central Research Institute of Electric Power Industry in 1989 and now is in charge of
coastal environmental issues as a Senior Research Scientist.