海滨电厂温排水对附近海域生态环境的影响

Effect of Once-through Warm Water Discharge of Coastal Power Plant on Marine Ecological Environment

本文基于2019年10月对湛江湾海滨电厂温排水受纳海域的采样调查,对比分析了温排水排放口附近站位(S9)和其他站位温度、溶解氧、营养盐和浮游植物群落结构的变化特征及影响因素。结果表明:排放口附近站位S9的表层温度受到了温排水的影响,其他站位几乎没有影响,温排水对于温度的影响主要集中在排放口附近的表层水体;排放口附近站位S9的溶解氧含量略高于其他站位,说明温排水的排放能提高排水口附近溶解氧含量;调查海域营养盐的分布主要受到湾内养殖区和湾外干净海水的共同影响,温排水仅对排放口附近(S9)营养盐含量造成局部影响;浮游植物群落调查结果表明,电厂附近站位S9的浮游植物群落结构与湾内其他站位群落结构差别不大,温排水对附近海域浮游植物群落结构的影响很小。综上所述,湛江滨海电厂温排水对附近海域生态环境影响较小。

Based on a sampling survey conducted in October 2019 in the Zhanjiang Bay,in which the oncethrough warm water discharged from coastal power plant,this paper compared and analyzed the change characteristics of temperature,dissolved oxygen,nutrients and phytoplankton community structure of the station(S9)near the thermal drainage outlet and other stations,as well as the influencing factors.The results showed that the surface temperature of station S9 near the discharge outlet was affected by once-through warm water discharge,while other stations have almost no effect.The impact of once-through warm water discharge on temperature was mainly concentrated in the surface water body near the discharge outlet.The dissolved oxygen content of station S9 near the discharge outlet was slightly higher than that of other stations,indicating that the once-through warm water discharge could increase the dissolved oxygen content near the discharge outlet.The distribution of nutrients in the surveyed sea area was mainly influenced by the combined effects of aquaculture areas in the bay and clean seawater outside the bay.The once-through warm water discharge only had a local impact on the nutrient content near the discharge outlet(S9).The results of phytoplankton community indicated that the phytoplankton community structure of station S9 near the power plant was not significantly different from that of other stations in the bay,and the impact of once-through warm water discharge on the phytoplankton community structure in the nearby sea area was minimal.In summary,the once-through warm water discharge of coastal power plant in Zhanjiang had a relatively small impact on the ecological environment of the nearby sea area.