研究目的
Estimating the depth of groundwater table using ground penetrating radar and discussing its accuracy by comparing with piezometer measurements.
研究成果
GPR is effective for determining groundwater table occurrence, but accuracy is influenced by signal propagation velocity in the unsaturated zone, which is affected by moisture content. The method shows strong correlation with piezometer measurements but has limitations in precision for minor depth changes.
研究不足
The accuracy of GWT estimation depends on electromagnetic wave propagation velocity, which varies with soil moisture content. Topographical corrections did not account for minor depressions and elevations, and the method is less precise for small seasonal fluctuations in groundwater table (up to 0.5 m). Measurements were not possible in winter due to snow cover.
1：Experimental Design and Method Selection:
The study used ground penetrating radar (GPR) with a common-offset method to estimate groundwater table depth. Theoretical models included electromagnetic wave propagation and reflection coefficients.
2：Sample Selection and Data Sources:
Measurements were conducted on esker deposits in sandy soils, with data collected along the same profile at five different times in 2014 and
3：A piezometer was used for comparative water level measurements. List of Experimental Equipment and Materials:
20 GPR ProEx system by Mala Geoscience with a shielded transmitting antenna (250 MHz frequency), notebook computer with GroundVision software, and ReflexW software for data processing.
4：Experimental Procedures and Operational Workflow:
GPR surveys were performed along a fixed profile, with data acquisition using the antenna and software. Processing steps included dewow, signal amplification, filtering, velocity analysis, depth conversion, and topographical correction.
5：Data Analysis Methods:
Velocity of wave propagation was calculated using time from radargrams and depth from piezometer. Statistical comparison and regression analysis were used to assess accuracy.
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