High-water Level River Discharge Measurement Method in Japan

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Non-Contact Surface Velocity Measurement Characteristic 1. Measure river surface velocity (estimate cross-sectional total discharge by summing up each of the cross-sectional areas. Vertically averaged velocity is calculated using a conversion factor ) 2. 4 types of Non-Contact Surface current meter were developed(The PWRI and other six private companies developed them for four years. The current meters are attached on bridge or bank of river, and we can observe automatically even from a remote office.
Assortment of Non-Contact Surface Current Meter1 • Doppler type 1. Radio wave-type current meter 2. Ultrasonic-type current meter
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 and 12: Hypothesis on Disturbed flow in the
Page 13 and 14: The observation by ADCP (19/12/2000
Page 15: Other flood River Discharge Measure
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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