阐述了桩基础范围内的河床冲刷实时监测的必要性；介绍了水压力传感器监测系统的应用、技术难 点和解决方案。通过潮位监测点的设置，有效解决了水位波动的修正问题，采用依托于基桩的单点定位埋设法 实现了传感器可靠定位和传感器信号的可靠传输，苏通大桥的工程实践表明，该方法具有实时性、连续性、长 期性和精度高的特点。根据实测结果分析了桩基础范围内河床局部冲刷的机理。

The problem of groundsill eroding is general and important for deep-water foundation in tidal reach.  Application,  technical difficulty and its settlement scheme of hydraulic pressure sensors system are introduced based on expounding the essentiality of riverbed erosion for real-time monitoring within group piled foundation. Amendment of fluctuant water level is realized by setting a sensor to monitor the tide. The sensors are fixed on the side of the piles reliably and sensor signal is transmitted smoothly with single point setting method. This method shows the characteristics of real-time,  continuity,  long-term and high precision when applied to the Su-Tong Bridge Project. Based on the results of monitoring, the mechanism of local scour within group piled foundation is analyzed.