Abstract
The CGN Taishan NPP seawater storage is a land-sealed type and is connected to the open water intake channel of Dajin Island in the open sea through a subsea tunnel. Due to the impact of large-scale facility aquaculture in the nearby seas, fish spawning grounds have been formed in this area, and fish breeds faster. A large number of fish have impacted on safe operation of nuclear power. In response to this situation, this study conducted acoustic navigation surveys of fish resources in most waters of the “Sea Reservoir” and “Water intake channel”, using broadband scientific fish finder system (EK80, 120kHz, 200kHz) produced by Norwegian Simrad Company. Evaluation of acoustic resources using echo integration method. The survey scope of seawater storage in this survey is from the entrance to the first barrier (around a distance of 760m) and from the first barrier to a second barrier (around a distance of 220m); the survey distance of the water intake channel is about 1460m. From the echo image, it can be found that the zooplankton in the sea reservoir is much smaller than the water intake channel, and the fish size of the water intake channel is much larger than that of the sea channel.Acoustic data was processed and analyzed using Echoview software to calculate the average SV and detect the strength of the single target. The results show that in the survey area of the Taishan Nuclear Power Plant Hai Reservoir, the total number of fish is about 1.38 million, the total weight is about 13.6 tons, and the fish with a body length of less than 20cm is the majority, and there are fewer large-sized fish; The total resources in the survey area is about 47 tons, with a total number of 27 million, and has a high density.
Highlights
The reservoir of CGNPC Taishan Nuclear Power Plant is a land closed-type reservoir connected to water-intake open channel on Dajin Island in open seas via subsea tunnel (Fig.1)
Both the seawater reservoir and water-intake open channel have been found with many fish species, which exert an influence on safe nuclear power operation [1]
With increasing fundamental acoustic researches on the fishery industry and promotion of practical application technologies in recent years, this method has been widely applied to fishery resource investigation and evaluation of the Yellow Sea, the East Sea and the South China Sea as well as main inland rivers like the Yangtze River and the Pearl River,and lakes and reservoirs, and outstanding effects have been achieved[7,8,9,10,11,12,13]
Summary
The reservoir of CGNPC Taishan Nuclear Power Plant is a land closed-type reservoir connected to water-intake open channel on Dajin Island in open seas via subsea tunnel (Fig.). Impacted by large-scale breeding industry in surrounding waters, a good fish spawning ground is formed in this area with fast fish reproduction. Both the seawater reservoir and water-intake open channel have been found with many fish species, which exert an influence on safe nuclear power operation [1]. With increasing fundamental acoustic researches on the fishery industry and promotion of practical application technologies in recent years, this method has been widely applied to fishery resource investigation and evaluation of the Yellow Sea, the East Sea and the South China Sea as well as main inland rivers like the Yangtze River and the Pearl River,and lakes and reservoirs, and outstanding effects have been achieved[7,8,9,10,11,12,13]. As the nuclear power plant was in shortage of necessary sampling netting gears, acoustic vessel-mounted method was adopted in this investigation and resource evaluation was implemented using echo integral method[14]
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