Center for Global Security

Outline of Research

More than 70 percent of the Earth's surface is covered by oceans. These bodies of water are not only essential for global trade and exchange, but also provide the sources of much of our energy supplies, natural resources and maritime products. Control over shipping routes and maritime resources has often been the cause of international conflicts and disasters. Although Japan's land area is relatively small by international standards (61st in the world), its declared Exclusive Economic Zone is quite large (4.5 million square nautical miles), thereby making Japan the country with the sixth largest sea area. Hence, the country's commercial and economic security is dependent on increasing the stability of transportation sea-lanes and protecting coastal facilities.

Maritime security research aims to promote the peaceful use and sustainable development of the ocean through the study of security issues, sea environments, resource development, international cooperation, and law. Examples of activities to promote these objectives include developing sonar systems to enhance coastal security, monitoring oceanographic phenomena and marine pollution to protect the environment, improving prospecting and mining technology to increase sea resource development, and finally, consolidating international cooperation to deal with sea-based terrorism and piracy to enhance maritime law. The Center for Global Security hopes to enhance security and stability through research in these various fields.

Maritime Security Research Project

We are working on the following projects.

1Developing new methods to detect coastal environmental variation risks caused by global warming (climate change)

(1) Overview
Assessment of the impact on coastal environments caused by global warming has mainly been done so far based on: ① disappearance of sandy beach areas by sea surface elevation, and; ② changes of biota by elevated water temperature. However, it is required to carry out composite environmental assessment to understand unequivocal ongoing global warming. This project is focused on bottom material and process which are fundamental of coastal environment as well as ecosystem. This aims to develop methods to detect coastal environmental variation risk by numerical modeling, satellite images, acoustic remote sensing.

(2) Project Director
Hiroshi Yagi, Professor, Department of Civil and Environmental Engineering, School of Systems Engineering, NDA

(3) Research Associates
Hanako Ogasawara, Associate Professor, Earth and Ocean Sciences, School of Applied Sciences, NDA

2【Completed】Basic research related to a novel sonar system using ocean ambient noise

(1) Overview
A method of imaging of underwater objects by using ocean ambient noise as a sound source, called ambient noise imaging (ANI). This is neither active nor passive, but the newest sonar method what we called “the third sonar method”. This project aims to develop the ANI prototype system with acoustic lens, and furthermore to attempt detections of images of silent targets under biological noise fields during sea trials.

(2) Project Director
Kazuyoshi Mori, Professor, Department of Earth and Ocean Sciences, School of Applied Sciences, NDA

(3) Research Associates
Hanako Ogasawara, Associate Professor, Department of Earth and Ocean Sciences, School of Applied Sciences, NDA
Takenobu Tsuchiya, Associate Professor, Department of Electrical Electronics and Information Engineering, Kanagawa University

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