可視化情報学会誌
Online ISSN : 1884-037X
Print ISSN : 0916-4731
ISSN-L : 0916-4731
画像処理による洪水流航空写真の解析
木下 良作上野 鉄男宇民 正
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1992 年 12 巻 1Supplement 号 p. 67-70

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A pair of aerial photographs of the flood flow in the Agano River on Sept. 25, 1966 was analyzed by the cross-correlation technique to obtain velocity vectors over the area of 1700 × 1000 m of the water surface. About 340 × 400 velocity vectors were obtained at every 5.0 m in streamwise and 2.5 m in spanwise direction.
The interval and arrangement of the longitudinal low-speed band and high-speed band appearing alternately in the spanwise direction over the water surface were analyzed and two kinds of spanwise scales of large scale turbulence were found; one is about twice water depth and another is 4 5 times.

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