河床地形实时在线监测系统开发及其应用

Development and Application of a Real-time Monitoring System for River Terrain

实时地形数据有利于河床演变分析和工程评估。基于超声波、4G无线传输、网络数据库等技术,研发了河床地形实时在线监测系统。为消除温度、盐度等因素对测量结果的影响,设计了超声波声速校核装置:利用固定校核面反射超声波信号,通过计时器获取超声波发射和反射信号时间间隔,从而反演超声波声速,实现对声速的实时校正。系统应用到姚江大闸下游河床地形监测,监测时段内河床地形淤积了0.041 m,对应时段内GPS-RTK测量结果为河床地形淤积了0.050 m,2种方法测量结果基本一致。实践应用结果表明本系统监测数据可靠,能用于地形实时监测中。

Real-time topographic data are useful for river bed evolution analysis and engineering assessment. In this article,a real-time online monitoring system for riverbed terrain is developed based on ultrasonic technology,4G wireless transmission and network database. An ultrasonic sound speed calibration device is presented to eliminate the influence of temperature and salinity on measurement results. The sound speed is obtained by inversion and is calibrated in real time according to the time intervals of ultrasonic transmission and reflection signal acquired by timer. The system is applied to the terrain monitoring in the downstream of Yaojiang Gate. In monitoring period,the river bed silted by 0.041 m,while the GPS-RTK observation result is 0.050 m,consistent with each other in general. Practice has shown that the presented system is reliable and feasible in real-time monitoring of river terrain.