Picture Analysis of Aerial Photographs of Flood Flows

Autor:	Ryosaku Kinoshita, Tadashi Utami, Tetsuo Ueno
Rok vydání:	1992
Předmět:	Surface (mathematics) Water depth Flood flow Flood myth Meteorology Scale (ratio) Turbulence Geometry Geology
Zdroj:	Journal of the Visualization Society of Japan. 12:67-70
ISSN:	1884-037X 0916-4731
DOI:	10.3154/jvs.12.1supplement_67
Popis:	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.
Databáze:	OpenAIRE
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