Abstract:

In the present,in the river model test of measuring flow velocity in the vertical direction,manual positioning is needed.With respect to this situation,we developed an automatic system of velocity measurement for cross-section,combined with advanced techniques such as a 2D automatic positioning instrument for measuring bridge and a 3D automatic measuring apparatus for topography.On the basis of measured data of cross-section topography,the measurement of water surface boundary is added,which can be used for subsequent calculations and the determination of positioning range for flow velocity sensor.In this system,we also use multiple sensors for rapidly synchronous measurements.This work brings technological breakthroughs in synchronous measurements for large-scale regions,and solves problems of manual positioning measurements such as low speed,low efficiency,etc.Finally,the system can not only fulfill the developing demand for model experiments,but also improve the research for model experiments in river.

Key words: model of river engineering, velocity measurement along depth, topography measurement, automatic measuring bridge, position measurement