グラスボート搭載イメージング蛍光ライダーによるサンゴ観測

DOI 日本農学文献記事索引 Web Site
  • 篠野 雅彦
    （独）海上技術安全研究所 運航・物流系
  • 松本 陽
    （独）海上技術安全研究所 運航・物流系，現：東京海洋大学 海洋科学部
  • 今里 元信
    （独）海上技術安全研究所 運航・物流系
  • 山野 博哉
    （独）国立環境研究所 生物・生態系環境研究センター
  • 小熊 宏之
    （独）国立環境研究所 環境計測研究センター

書誌事項

タイトル別名
  • Coral Observation by Fluorescence Imaging Lidar on a Glass-bottom Boat
  • グラスボート トウサイ イメージング ケイコウ ライダー ニ ヨル サンゴ カンソク

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抄録

Reef-building corals are threatened by global climate change and other problems, and thus the monitoring of regional coral distributions is becoming increasingly important. We developed a glass-bottom-boat-based coral observation system that uses lidar (light detection and ranging) techniques for large-area coral monitoring. The lidar system consisting of an ultraviolet (UV) pulsed laser with a wavelength of 355 nm and a gated ICCD camera has been designed and tested. Most reef-building corals have fluorescent proteins that emit blue-green fluorescence on UV excitation. Seabed images were recorded by emitting UV pulsed laser and receiving fluorescence by the gated ICCD camera synchronized with the laser. Because the exposure time is very short, the sunlight background effect for the lidar image is suppressed, and this makes it possible to detect weak UV excited fluorescence even in the daytime. Live corals can be distinguished from dead coral skeletons based on the fluorescence images by verifying the coral image pattern and fluorescence intensity. We evaluated the system in a testing basin to 30-m depth, and we used the system to observe corals using a glass-bottom boat at Taketomi Island, Okinawa, Japan. Information about the live coral distribution along the boat track was obtained successfully around the island at depths from 2 to 12 m.

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