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首页> 外文期刊>Journal of geophysics and engineering >Detection of water content inhomogeneities in a dike model using invasive GPR guided wave sounding and TRIME-TDR? technique
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Detection of water content inhomogeneities in a dike model using invasive GPR guided wave sounding and TRIME-TDR? technique

机译:使用侵入式GPR导波测深和TRIME-TDR检测堤防模型中的水分不均匀性技术

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摘要

Guided wave sounding (GWS), an invasive application of ground-penetrating radar (GPR), and time domain reflectometry with intelligible micro elements (TRIME-TDR?) were used to investigate the distribution of volumetric water content (VWC) in a dike model under controlled conditions in order to detect possible dike damage. The dike model, which was constructed with soil of the texture class loamy sand, was flooded at different levels of water between 0.3 and 1.25 m high from a waterproof baseline. The two techniques were applied to retrieve VWC information from the same location at the crest of the dike model. Both techniques assessed reflection data from the lower end of a metal probe lowered through a common access borehole and successfully detected a water content inhomogeneity in the model at a depth of about 0.6 m from the crest. Comparison of the colocated VWC measurements from the two techniques showed almost identical trends with a root mean square deviation of 0.018 m ~3m ~3. GWS, however, showed a much higher depth resolution than TRIME-TDR?. Accompanying analytical and numerical modelling show that GWS sounding should be applicable to water content exploration in existing, 1020 m deep boreholes.
机译:导波测深(GWS),侵入性雷达(GPR)的应用以及带有可理解的微元素的时域反射法(TRIME-TDR?)被用于研究堤防模型中体积水含量(VWC)的分布在受控条件下,以检测可能的堤防损坏。堤防模型是用质地类沃土砂建造的,在距防水基准线高0.3至1.25 m的不同水位下淹没。应用了这两种技术来从堤防模型顶部的相同位置检索VWC信息。两种技术都评估了从一个金属探头的下端反射的数据,该金属探头通过一个共同的通孔而下降,并成功地检测到距波峰约0.6 m深度的模型中的水含量不均匀性。两种技术的并置VWC测量结果的比较显示出几乎相同的趋势,均方根偏差为0.018 m〜3m〜3。但是,GWS显示出比TRIME-TDR?高得多的深度分辨率。伴随的分析和数值模拟表明,GWS测深仪应适用于现有的1020 m深钻孔中的含水量勘探。

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