台湾西部河川的中下游主河道均有严重下降的情况，台风、洪水侵袭期间由于水位和冲刷深度的变化严重影响桥梁安全。桥梁管理单位常以水位高程作为封桥决策的依据，这虽然简单，但缺乏强而有力的技术支撑。因此，在洪流冲击下仍能稳定应用冲刷深度监测系统十分重要。在国内外已实施的冲刷自动化观测方法中，仪器设备受河道冲淤形态、高含沙量、高盐度、装置固定困难和在现场布置时与施工发生冲突等局限，往往不能实时反映涉水桥基的局部冲刷性态。因此，研究引用苏通大桥冲刷监测技术，通过沉底式水压计对河床面与水位（水头）实时量测，比对相对水头差异，以求取冲刷面的深度。苏通大桥属泥砂质河床，研究桥段属卵砾石河段，但台湾地形狭长，河川坡陡、水流湍急，对于监测设备的建置与保存较苏通大桥更为困难。研究特别考虑适用于现场环境恶劣的土建工程安全监测，采用了坚固且密封的钢箍，使水压计能在长期监测过程中保持极高的可靠性与稳定性，并且可在恶劣环境中正常运作的监测仪器十分必要。
The middle stream and upstream of main rivers in western Taiwan exists serious subsidence situation. The changes in the real-time water level and scour depth during flood and typhoon seasons influence the safety of bridges significantly. Bridge management unit often use water level elevation as a bridge closure decision basis. Although simple, but this is lack of a strong technical support. Therefore, scour depth monitoring system capable of functioning in the floods impact is very important. Among existing automatic observation methods for scour, the instruments and equipments are limited to the river course silting form, high sand content, high salinity, difficult device installation and conflict between onsite laying and construction. They may not reflect local scour behavior of submerged bridge foundation in a timely manner. Therefore, this study cited the Sutong Bridge scour monitoring technology, through the sunk piezometer under riverbed and water level real-time measurement to comparison of the head difference to find the scour depth. However, the Sutong Bridge is a sandy riverbed. In this study, the bridge is a gravel riverbed. Due to the long and narrow terrain of Taiwan, the river is steep and fast. For the construction and preservation of monitoring equipment is more difficult to measure than the Sutong Bridge. This study has considered the safety monitoring of civil engineering suitable for the harsh environment. The use of a sturdy and sealed steel hoop helped the piezometer not only maintain a high degree of reliability and stability in the long-term monitoring process, but also can be operation in the harsh environment.
