Work

Topographic correction for ground penetrating radar for enhanced detection of dike subsurface anomalies

Year: 2025

Type: article

Abstract: Dikes are critical components of flood control infrastructure in China. Ground-penetrating radar (GPR) is widely used for non-destructive detection of subsurface anomalies (e.g., cavities, seepage paths, and soil loosening) in dikes. Conventional GPR surveys are typically conducted along longitudinal lines on the dike crest, which limits comprehensive cross-sectional assessment. This study introduces a novel trapezoidal survey layout that integrates data from upstream/downstream slopes and the crest, coupled with a terrain-correction algorithm. The method projects slope-acquired radar signals onto a topographic model, enabling fused visualization of subsurface anomalies and dike morphology. Validated via borehole and cone penetration tests (CPT) at a Yellow River dike site, the corrected GPR profiles accurately delineated soil stratification and localized a loose-soil zone at the downstream slope foot. This approach significantly enhances interpretability for dike safety assessments.

Source: Scientific Reports

DOI: 10.1038/s41598-025-27047-0

Authors: Changzheng Li, Xiang Zhao

Institutions: Ministry of Water Resources of the People's Republic of China, Yellow River Institute of Hydraulic Research

Language: English

Topic: Geophysical Methods and Applications

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funder: National Natural Science Foundation of China