Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground-penetrating radar (GPR): field experiment
Analysis of fluvial, lacustrine and anthropogenic landforms by means of ground-penetrating radar (GPR): field experiment
复制标题
利用探地雷达 (GPR) 分析河流、湖泊和人造地貌：现场实验
DOI：
10.3997/1873-0604.2014033
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发表时间：
2014
影响因子：
1.6
通讯作者：
M. Słowik
中科院分区：
文献类型：
--
作者：
M. Słowik
研究测量条件对穿透深度影响的现场实验
探地雷达调查的解决是在奥布拉河谷中部（波兰西部）进行的。测试
沿着代表河流、湖泊和人类地貌的三个地点的五条剖面线进行。探地雷达调查是在各种水文地质条件下进行的：高水文地质条件和高水文地质条件。
地下水位低，冬季条件下地面被雪/冰覆盖并结冰。在地下水位较低的时期发现了河流地貌内部结构成像的最佳测量条件。在地下水位较高的情况下，雷达剖面的底部部分被由于研究部分的不饱和部分和饱和部分之间的含水量差异而产生的混响所掩盖。当所有沉积物都饱和时，湖泊地貌中的一些沉积结构在高海拔处更容易看到。在冬季条件下，只有在高架的人为地貌上进行测量时才能获得高质量的雷达剖面，而不受其他地貌中由于冰盖和地表之间存在水层而导致的雷达信号分散和衰减的影响。研究还表明，可以对由含有大量淤泥的沉积物构成的地貌的沉积结构进行成像，尽管在这种情况下穿透深度会减小。
A field experiment aiming to study the influence of measurement conditions on depths of penetration
and resolution of GPR surveys was conducted in the middle Obra valley (western Poland). The tests
were carried out along five profile lines in three sites representing fluvial, lacustrine and anthropogenic landforms. The GPR surveys were conducted at various hydrogeological conditions: high and
low groundwater levels, and in winter conditions when the ground was under snow/ice cover and frozen. The best measurement conditions for imaging the internal structure of fluvial landforms were found during a period of low groundwater levels. At high groundwater levels the bottom parts of radar profiles were obscured by reverberations originating from the differences in the water content between unsaturated and saturated parts of the studied sections. Some sedimentary structures within lacustrine landforms were better seen at high levels when all the deposits were saturated. In winter conditions, high quality radar profiles were obtained only when measurements were conducted on an elevated, anthropogenic landform, unaffected by dispersion and attenuation of the radar signal in the other landforms due to a water layer situated between the ice cover and land surface. It was also shown that it is possible to image sedimentary structures of landforms built of deposits with significant admixtures of silts, although the depths of penetration are reduced in such cases.