Through investigating and collecting the data of original field observation about warm water discharged from thermal power plants

and adopting methods of observed data analysis and comparison with the model test

the influence of warm water discharged from Zhenhai Power Plant located at the estuary of Yongjiang Rever upon the temperature rise of intake water has been studied.Study shows that:(1)the temperature of intake water for Zhenhai Power Plant has exceeded the maximum designed temperature of 33.5 ℃ in some time under present condition

the exorbitant temperature rise has been affecting the operation efficiency of units;(2)based on the difference of measuring points arrangement in data of original field observation

it is feasible to use method of analysing the temperature rise variation along with the tide in whole process of fixed reference points

and the method of analysing the varying reference points directing against a characteristic moment respectively

providing reference for engineering design of water-intaking hole and water-draining hole for other power plants situated on the estuaries.