Investigation of Monitoring Fish Using Underwater Fish-Eye Camera at the Test Site of Marine Renewable Energy

2018 ◽  
Author(s):  
Takero Yoshida ◽  
Daisuke Kitazawa ◽  
Yoichi Mizukami ◽  
Qiaochu Chen ◽  
Akito Mochizuki
Keyword(s):  
Renewable Energy ◽  
Test Site ◽  
Wave Power ◽  
Energy Device ◽  
Power Generator ◽  
Horizontal Visibility ◽  
Marine Renewable Energy ◽  
Before And After ◽  
Fish Eye ◽  
Iwate Prefecture

Assessment of any significant effects on the local marine environment when considering the installation of a marine renewable energy device is of the utmost importance. In particular, the effect of such device on fish is concerned by local fishermen. To confirm variation of fish before and after installing the device of marine renewable energy, we investigated effective monitoring system using an underwater fish-eye camera. In this paper, visibility of the fish-eye camera was tested off Kamaishi city, Iwate prefecture, Japan, which is a test site of marine renewable energy in Japan. Device of wave power generation is planning to install at this site in the future. We confirmed the visibility of the fish-eye camera using a fish-shaped target by changing the distance between the target and camera. The water depth and photon were simultaneously measured. From the result, the horizontal visibility was discussed, and then we made a plan to observe around wave power generator using this fish-eye camera.

Development of Wireless Control System With Underwater Fish-Eye Camera to Monitor Fish at the Test Site of Marine Renewable Energy

2019 ◽  
Author(s):  
Takero Yoshida ◽  
Yoichi Mizukami ◽  
Jinxin Zhou ◽  
Daisuke Kitazawa
Keyword(s):  
Renewable Energy ◽  
Real Time ◽  
Test Site ◽  
Energy Device ◽  
Camera System ◽  
Wireless Monitoring ◽  
Marine Renewable Energy ◽  
Wireless Control ◽  
Before And After ◽  
Fish Eye

Abstract Environmental impact assessment is important when marine renewable energy device is installed. Fishermen concern the effect of device on local fish. To confirm the effect before and after installation of marine renewable energy device, we developed wireless monitoring system using an underwater fish eye camera. The camera system is composed of a dome-shaped fish eye lens, a container, and a float. Two thrusters are attached on the container to change the monitoring directions. In the current research, this system was developed to monitor underwater situation around device remotely and in real time. We tested to monitor a target and fish in a fish case at the site off Kamaishi city. The recorded video showed the target and fish. Effectiveness of this system was shown through the field test for real time monitoring around marine renewable energy device.

Observing Fish Using Underwater Camera at the Test Site Before Installing Ocean Power Generation

2017 ◽  
Author(s):  
Takero Yoshida ◽  
Daisuke Kitazawa ◽  
Yoichi Mizukami
Keyword(s):  
Renewable Energy ◽  
Water Depth ◽  
Test Site ◽  
Video Camera ◽  
Marine Renewable Energy ◽  
Before And After ◽  
Demonstration Site ◽  
Ocean Environment ◽  
Underwater Camera ◽  
Fish Eye

Assessment of local ocean environment is significant when devices of marine renewable energy are installed at a demonstration site. A concern about how these devices affect the existence of fish is remained among local fishermen. To confirm variation of fish before and after installing the devices of marine renewable energy, we investigated fish using an underwater camera before installation as a main objective of this paper. First, fish-eye video camera was tested to monitor in a fish cage off Kamaishi city, Iwate prefecture, Japan. We aimed to observe the abundance of fish and to specify the species of fish. The fish-eye video camera is composed of a dome-shaped lens, a container, and a digital video equipped into the container. The recorded video showed outlines of fish, consequently it may be possible to know the abundance of fish. However, specifying the species of fish has a difficulty if we use fish-eye camera since the recorded image is unclear enough to identify correctly. In addition, we examined horizontal transparency of fish-eye camera using a fish-shaped target. Before recording by the video camera, vertical transparency was measured using a white plate. Then we recorded the images by varying the water depth and the distance between the camera and target. When the target was close to the camera, it can be displayed clearly, nevertheless the outline of the target was smeared with increasing the distances between them. Our measurement suggested that the horizontal transparency might be relating to the parameters of water depth and vertical transparency. The investigation was conducted under the one condition, thus we need to obtain further data to understand horizontal transparency qualitatively. Next time, we will conduct another test using additional underwater optical video camera, which is attached on the fish-eye video camera. The combination of these two types of video cameras may enable to observe the abundance of fish as well as to specify the species of fish.

Possibilities for a Novel Wave Power Generator Using Dielectric Elastomers

2020 ◽  
Author(s):  
S. Chiba ◽  
M. Waki ◽  
C. Jiang ◽  
K. Fujita
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wave Power ◽  
Generation System ◽  
Ocean Energy ◽  
Power Generator ◽  
Energy Demands ◽  
Worldwide Population ◽  
Power Generation System ◽  
Effective Use

Abstract As industrialization, worldwide population growth, and improvements in the living standards in developing countries continue, demands for energy, food, and water, likewise surge. This in turn accelerates global warming, and its resultant extreme weather effects. Among the measures proposed to meet the growing energy demands, the use of renewable energy is gaining more and more attention. In particular, wave power generation is attracting a great deal of attention as an effective use of ocean energy. However, current wave generators are large and very expensive relative to their output. Furthermore, they cannot generate power efficiently with wave directivity, small amplitude waves and so on. For these reasons, widespread use is very limited. In order to solve these problems, this paper discusses the possibility of a recently developed wave power generator that uses a newly developed dielectric elastomer (DE) as a new way to harvest renewable energy. We also discuss the technical breakthrough of building a mega power generation system using DEs.

Combined Optical and Acoustic Monitoring of Fishes in the Demonstration Site of Marine Renewable Energy Development

2016 ◽  
Author(s):  
Daisuke Kitazawa ◽  
Yoichi Mizukami
Keyword(s):  
Renewable Energy ◽  
Acoustic Wave ◽  
Fish Species ◽  
Video Camera ◽  
Water Tank ◽  
Fishing Vessel ◽  
Energy Devices ◽  
Marine Renewable Energy ◽  
Demonstration Site ◽  
Fish Eye

Before the installation of marine renewable energy devices, fish species and abundance should be examined for selecting the proper site where the effects of the devices on the environment and fish will be as small as possible. Fish species and abundance can be examined in a variety of methods such as a fish finder using an acoustic wave and fishing gears such as a gill net. However, the fish finder cannot specify the species of fish that is sometimes estimated from the experience of fishermen or scientific researchers. Some amounts of fish must be removed from the target sea area in case of using the fishing gear, while the species of fish can be specified. In the present study, an underwater optical video camera is combined with the fish finder using an acoustic wave to specify the species of fish. A circular fish-eye digital video camera is inserted into a waterproof container. A part of the container is made of glass in a dome shape for the circular fish-eye lens. The container is attached to polyethylene ropes and is towed by a fishing vessel. First, the hydrodynamic characteristics of the container was examined by a towing test with the three kinds of towing speed in a water tank. Then the container was towed in the real sea, which is the demonstration site of offshore wind and wave energy developments off Kamaishi of Iwate Prefecture. The depth of the video camera with the container was not constant since the moving speed of the fishing vessel was slow and fluctuating. The image of video camera could be captured successfully together with that of the acoustic video camera, while fish could not be found in both the optical and acoustic measurements in the present investigation. The investigation will be continued, and the effects of transparency of water should be discussed as future works. Also the actual or model fish should be captured by the underwater video camera to evaluate if it can specify the species of fish.

scholarly journals Vertical migrations of fish schools determine overlap with a mobile tidal stream marine renewable energy device

2020 ◽  
Vol 57 (4) ◽  
pp. 729-741
Author(s):  
Timothy A. Whitton ◽  
Suzanna E. Jackson ◽  
Jan G. Hiddink ◽  
Ben Scoulding ◽  
David Bowers ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Device ◽  
Fish Schools ◽  
Marine Renewable Energy ◽  
Tidal Stream

A Prototype of DEAP Ocean Wave Powered Generator

2011 ◽  
Vol 347-353 ◽  
pp. 3430-3433
Author(s):  
Ke Sheng Wang ◽  
Ming Chen
Keyword(s):  
Renewable Energy ◽  
Knowledge Discovery ◽  
Wind Power ◽  
Science And Technology ◽  
Ocean Wave ◽  
Wave Power ◽  
Power Generator ◽  
Power Generators ◽  
Human Power

Ocean wave power is emerging as a particularly attractive form of renewable energy. Dielectric Electric Active Polymers (DEAP) have has been used to transform electrical to mechani¬cal energy in an actuator mode. However it has few applications in a generator mode. This paper introduces a new concept of “New Renewable Energy” and presents a prototype of DEAP ocean wave powered generator, which has been developed at Knowledge Discovery Laboratory (KDL), Norwegian University of Science and Technology (NTNU). The DEAP prototype could be easily extended to other applications such as human-power generator, conventional power generators, and wind power applications.

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