Development and Investigation of Marine Pollution SurveyMethod Using Sea Level Hue Change by Satellite Image ofVisible Light
Article ID: 2018-0014
Details
Article ID: 2018-0014
可視光の衛星画像を新たな環境科学の研究資料及び教材とするための解析手法を開発した．環境の異変は特に微細な色相の変化に現れるので，色相とコントラストの強調法を新たに開発し, その手法を用いて2018年1月のタンカーSanchi号の沈没事故後のひまわり8号撮影の衛星写真を解析したところ，海中に投棄された凝縮物(Condensate)の影響は見いだせなかったが，重油と考えられる海面の黒色帯が存在することが分かった．また東シナ海の富栄養化が日本の排他的経済水域(Exclusive Economic Zone: EEZ)近くまで及んでいること，時にはその海水の一部が九州西岸に到達することが分かった．
2 hours before sinking of oil tanker Sanchi. The photograph is an accumulated one of 33 images shooting per 2.5 min between 13:37:30 ∼14:57:30, JST, on Jan. 14, 2018. The centers of 2 red circles of radius 300 and 350 km are Shanghai and Amami-city. Point A and B are the collision and sink points. The image indicates the surface color of the sea, dusts, and clouds in the atmosphere. Land and islands are drawn in black. Smoke from the tanker is black at B-point. Colors of the East China Sea are black-red, pale blue, and blue from the coast of China, respectively. The pale blue indicates the eutrophication area that is found at the estuary. The dusts are green, and the clouds are yellow. They move, the edges are rubbing because of composite process for 80 min.
The area of Figure-1, photographed at March 29, 2018. The centers of 2 red circles of radius 300 and 350 km are Shanghai and Amami-city. Point A and B are the collision and sink points of Sanchi. The image indicates surface color of the sea, dusts, and clouds in the atmosphere. Land and islands are drawn in black. Colors of the East China Sea are brown to black-red, green, pale blue, and blue from the coast of China, respectively. The pale blue indicates the eutrophication, which is constructed of many vortexes and goes to Japan-coasts. Dusts in the atmosphere are drawn as greenish black, and the clouds are yellow. Their edges are rubbing. The accumulation is 160 min.
The area of Figure 1, photographed at April 19, 2018. The centers of 2 red circles of radius 300 and 350 km are Shanghai and Amami-city. Point A and B are the collision and sink points of Sanchi. The image indicates the surface color of the sea, dusts, and clouds in the atmosphere. Land and islands are drawn in black. Colors of the East China Sea are brown to black-red, green, pale blue, and blue from the coast of China, respectively. The pale blue indicates eutrophication, which is constructed of many vortexes. Contamination density of the area near Japan coast becomes small compared with March 29. Dusts in the atmosphere are drawn as greenish black, and the clouds are yellow. Their edges are rubbing. The accumulation is 120 min.
Water contamination indexes of the East China Sea, along a line from Shanghai to Koshikijima, measured at April 19, 2018. Zone A is contaminated area by various matters. Zone T is the clear sea purified by tide. Zone C is hidden sea surface by the clouds. Zone E is eutrophication sea water.
The area of Figure-1, photographed at July 31, 2015. The centers of 2 red circles of radius 300 and 350 km are Shanghai and Amami-city. Point A and B are the collision and sink points of tanker Sanchi. The image indicates the surface color of the sea, dusts, and clouds in the atmosphere. Land and islands are drawn in dark green or black.
Status of Japan Sea, photographed at April 21, 2018.
