High-water Level River Discharge Measurement Method in Japan

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Technical Problem of Measurement using Floats.3 (Hypothesis on parallel spiral flow) ‘Parallel spiral flow’ is created in the downstream of bridge basements. Floats are apt to be concentrated in the lines. Velocity is about +10% more than the average.” According to Dr. Ryosaku KINOSHITA (1998) A discussion on the flood discharge measurement in the downstream of river, Journal of Japan Society of Hydrology & Water Resources, vol.11, No.5, pp.460-471 471 (in Japanese).
The observation by ADCP (19/12/2000,Mashimo discharge observatory) Hypothesis of parallel spiral flow The figure which changed the depth to width into 1 to 1 :uv component Contour diagram :w component Contour diagram Upstream Downstream From upstream and downstream the periodic structure appeared regularly. we can guess the existence of a parallel spiral flow.
Page 1 and 2: Flood River Discharge Measurement M
Page 3 and 4: Feature of River in Japan • Catc
Page 5 and 6: Feature of Flood River Discharge Me
Page 7 and 8: Measurement using Floats • Charac
Page 9 and 10: Technical Problem of Measurement us
Page 11: Hypothesis on Disturbed flow in the
Page 15 and 16: Other flood River Discharge Measure
Page 17 and 18: Assortment of Non-Contact Surface C
Page 19 and 20: Problem of Non-Contact Surface Velo
Page 21 and 22: Problem of Non-Contact Surface Velo
Page 23 and 24: Pressure-type Flood Current Meter
Page 25 and 26: Measurement using ADCP(by radiocont
Page 27 and 28: Conclusion • Float observation is

High-water Level River Discharge Measurement Method in Japan

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