管线渗漏作为城市地下管网系统中普遍存在的病害之一,不仅导致水资源浪费和环境污染,还会引起道路空洞等隐蔽缺陷,严重时造成塌陷事故。听音法已广泛用于地下管线渗漏探测,但受环境噪声影响该方法的定位精度较低且工作时段需选择夜间等低干扰时段。探地雷达(GPR)是地下管线探测的重要方法,然而使用GPR 探测和定位管线渗漏仍处于实验室研究阶段。文中提出了一种基于GPR 和小波熵分析的地下管线渗漏探测与定位方法,并通过现场模型试验进行了验证。试验结果表明,相较于听音法,所提出的基于GPR 数据的小波熵方法能够精确定位地下管线的渗漏位置,研究成果可有效弥补当前地下管线渗漏探测与定位方法的不足,为管线渗漏探测与定位提供有效工具。

Underground pipeline leakage is a common problem in subterranean pipeline systems, which can cause water waste, environmental pollution, and hidden defects such as subsurface cavities. These cavities can lead to collapse accidents if left unrepaired. Leak listener is the most widely method for detecting pipeline leakage, but it has significant limitations because it is sensitive to environmental noises. Therefore, leak listener requires low-interference periods (e. g. , night time) for conducting the detection. Ground penetrating radar (GPR) is another important method for locating underground pipelines, but the detection and localization of pipeline leakage based on GPR data is still lacking. Thus, a wavelet entropy method is proposed for identifying and locating pipeline leakage in GPR images. Then, the proposed method is verified and compared with the leak listener method by performing a field experiment. Results show that the proposed method can locate the leakage point more accurately than the leak listener. The findings of this study effectively address the current shortcomings in underground pipeline leak detection and location, providing a practical tool for identifying and locating leaks.

TN957.51

国家自然科学基金资助项目(52379099);广州市科技计划(SL2022A03J00990)