2023年冬季宁德核电冷源海域棘头梅童鱼(Collichthys lucidus)资源声学评估

Acoustic assessment of Collichthys Lucidus resources in the winter of 2023 in the cooling water area of Ningde Nuclear Power Plant

滨海核电厂冷却水源的取水安全正受到海洋生物暴发引起的堵塞威胁,鱼类堵塞核电冷源的事件时有发生。声学技术在海洋生物探测方面具有高效、实时的优势,因此,被广泛应用于海洋生态系统研究。为了解冬季宁德核电厂冷却水源取水海域棘头梅童鱼(Collichthys lucidus)的密度和运动规律,利用声学技术对相关海域冷却水源生物量进行了测量和评估。研究结果显示,棘头梅童鱼为研究海域的优势种,拖网调查显示平均尾数密度为1964尾·km^(-2),平均质量密度为0.483 kg·km^(-2)。棘头梅童鱼丰度在研究海域向核电厂方向减少,质量密度以核电厂温排水区域站点最高。通过对鱼类回波特征和个体轨迹的追踪统计,分析了该海域冬季内单体目标强度检测及其空间结构分布、资源现存量和资源丰度密度的时空分布变化。声学走航海域鱼类平均密度为2.78×10^(5)尾·n mile^(-2),生物量密度均值为1.41×10^(4) kg·n mile^(-2),棘头梅童鱼资源总量为7.47×10^(5) kg。研究表明,声学技术在宁德核电厂取水海域冬季冷却水源生物量测量中具有明显优势。通过不断改进和优化方法,声学技术将能更好地支持核电厂取水海域的生态环境监测与资源管理,为冷却水源取水安全提供科学依据。

The safety of seawater intake for cooling at coastal nuclear power plants is under threat due to blockages caused by outbreaks of marine organisms,with incidents of fish blockages in nuclear power cooling water sources occurring frequently.Acoustic technology,known for its efficiency and real-time capabilities in marine organism detection,is widely applied in the study of marine ecosystems.In order to understand the density and movement patterns of Collichthys lucidus,and the dominant species in the cooling water source intake area of Ningde Nuclear Power Plant during spring,this study utilized acoustic technology to measure and assess the biomass in the relevant marine area.The results of the study indicate that Collichthys lucidus has an average abundance density of 1964·km^(-2) and an average weight of 0.483 kg·km^(-2) based on trawl surveys.The abundance of Collichthys lucidus decreases from the study area towards the direction of the nuclear power plant,with the highest mass density observed in the nuclear power plant’s warm discharge water area.Through tracking and analyzing the echo characteristics and trajectories of individual targets during spring,the study assesses the spatial and temporal distribution changes in target intensity,spatial structure,resource abundance and density.The average density of fish in the acoustic survey area is found to be 2.78×10^(5)·n mile^(-2),with a mean biomass density of 1.41×10^(4) kg·n mile^(-2).The total resource quantity of Collichthys lucidus is estimated to be 7.47×10^(5) kg.The research demonstrates the significant advantages of acoustic technology in measuring biomass in the cooling water source intake area of Ningde Nuclear Power Plant during spring.Through continuous improvement and optimization,acoustic technology can better support ecological environmental monitoring and resource management in nuclear power plant water intake areas,providing scientific basis for the safety of cooling water source intake.