To continuously observe a flow rate by arranging an acoustic Doppler current meter so that observation in a horizontal direction can be made, and by simultaneously observing a water level, flow-velocity distribution, and the level of the bottom of a river.
In an acoustic Doppler current meter(ADCP), a reflection wave from an suspension object under water changes a frequency corresponding to the movement speed of the suspension object, thus detecting each beam at upstream and downstream sides by the wave transmitter/receiver of the ADCP, and measuring a flow rate in each beam direction. The ADCP is arranged in a horizontal direction, and at the same time can be moved up and down, thus allowing a plurality of lateral lines to be measured, and hence observing sectional flow velocity distribution corresponding to change in a water level. Furthermore, the ADCP is arranged at a riverside toward a slantingly lower part, and is moved at equal speed, thus measuring the shape of the bottom of a river by an ultrasonic beam being discharged, and obtaining sectional area with water level data. Then, the ADCP is moved up and down according to he change in the water level, and flow velocity in a crosswise direction at each height is measured, thus obtaining a flow rate on each division section by multiplying each division sectional area by the flow velocity.
KOKUBO TETSUYA
MAEDA YUZO
TSUNODA MEGUMI
KITAYAMA KAZUNORI
RYU AKIYOSHI
MORI RYOKO
NEWJEC INC
Next Patent: MULTI-FREQUENCY DOPPLER FLOWMETER