Due to less visibility, underground facilities such as sewer pipelines are subjected to degradation until a major failure occurs. So, leakage detection of deteriorated underground sewer pipes is necessary to prevent expensive rehabilitation costs. The major causes of the frequent occurrence of ground subsidence and sewer leakage are excessive use of groundwater, reckless exploitation of natural resources, etc. In this study, the aerial thermal imaging (ATI) technique has been used to identify the leakage points in sewer pipelines by analyzing surface thermal diffusion behavior of the ground surface. Leakage is suspected at points of anomalous temperature variation. Then, ground-penetrating radar and closed-circuit television surveys have been carried out to strengthen the suspicion of sewer leakage. Irregular, erratic parabolic-shaped lines are observed at the points where the leakage is suspected through ATI. Finally, the test-pit excavation and simple cone penetration tests have been carried out which confirms the sewer leakage points. The leakage points are confirmed by a greater depth of penetration. The results of the cone penetration test carried out in E-21 and 23-24 sewer pipelines show that the depth of penetration at the leakage points is about 35 cm, which is greater than the depth of penetration at other points. So, it can be concluded that the aerial thermal imaging technique is an effective method to predict leakage in deteriorated underground sewer pipelines.

中文翻译：

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航空热成像对劣化地下污水管道渗漏检测的初步研究

由于能见度较低，下水管道等地下设施会退化，直到发生重大故障。因此，有必要对老化的地下下水道管道进行泄漏检测，以防止昂贵的修复成本。地面沉降和下水道泄漏频繁发生的主要原因是过度使用地下水、不计后果地开采自然资源等。 本研究采用航空热成像（ATI）技术识别下水道管道泄漏点。通过分析地表的表面热扩散行为。在温度异常变化的点怀疑泄漏。随后，开展了探地雷达和闭路电视调查，以加强对下水道泄漏的怀疑。不规律的，在怀疑通过 ATI 泄漏的点处观察到不规则的抛物线形线。最后，进行了试坑开挖和简单的锥入度试验，确定了下水道泄漏点。泄漏点通过更大的穿透深度来确认。在E-21和23-24污水管道中进行的锥入度试验结果表明，泄漏点处的渗透深度约为35厘米，大于其他点的渗透深度。因此，可以得出结论，航空热成像技术是预测恶化的地下污水管道泄漏的有效方法。已经进行了试坑开挖和简单的锥体穿透试验，确认了下水道泄漏点。泄漏点通过更大的穿透深度来确认。在E-21和23-24污水管道中进行的锥入度试验结果表明，泄漏点处的渗透深度约为35厘米，大于其他点的渗透深度。因此，可以得出结论，航空热成像技术是预测恶化的地下污水管道泄漏的有效方法。已经进行了试坑开挖和简单的锥体穿透试验，确认了下水道泄漏点。泄漏点通过更大的穿透深度来确认。在E-21和23-24污水管道中进行的锥入度试验结果表明，泄漏点处的渗透深度约为35厘米，大于其他点的渗透深度。因此，可以得出结论，航空热成像技术是预测恶化的地下污水管道泄漏的有效方法。这大于其他点的穿透深度。因此，可以得出结论，航空热成像技术是预测恶化的地下污水管道泄漏的有效方法。这大于其他点的穿透深度。因此，可以得出结论，航空热成像技术是预测恶化的地下污水管道泄漏的有效方法。