基于被动红外热成像的土石堤坝渗漏探测试验研究

目前堤坝汛期渗漏险情的发现仍以人工巡视为主要手段,严重制约了应急处置水平.为探究自然环境条件下被动红外热成像探测土石堤坝渗漏的可行性及其热图像特征和规律,搭建了能充分模拟土石堤坝汛期真实服役条件的试验平台.试验表明,午后和夜间是利用红外热成像巡查土石堤坝渗漏的较佳时段,午后渗漏出口通常表现为低温异常,而夜间则表现为高温...

Experimental study on leakage detection of earth rockfill dams using passive infrared thermography

At present, manual patrol is still the main means to inspect leakage dangers of the embankment in flood season, which seriously restricts the level of emergency disposal. To explore the feasibility of passive infrared thermography sensing earth rock dam leakage under natural environmental conditions, an earth dam leakage model test platform which can fully simulate the real service conditions of earth rock dam and river embankment in flood season is built. The test results show that afternoon and night are the better time to detect the leakage of earth rockfill dams by infrared thermography. The leakage outlet usually shows low temperature anomaly in the afternoon and high temperature anomaly during night. The concentrated leakage affected zone has obvious trailing contour characteristics and temperature gradient variation characteristics centered on the leakage outlet on the thermal image. Whether the downstream dam slope is covered with turf or not, it is feasible to detect the leakage of earth rockfill dams by passive infrared thermography under natural environmental conditions.