Harris Hawks Optimization for Soil Water Content Estimation in Ground-Penetrating Radar Waveform Inversion

• Published in: Remote sensing (Basel, Switzerland) Vol. 17; no. 8; p. 1436
• Main Authors: Qiao, Hanqing, Zhang, Minghe, Bano, Maksim
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.04.2025
• Subjects: Algorithms; Energy; Estimation; Experimental data; Ground penetrating radar; Harris hawks optimization; Hawks; Local optimization; Mathematical optimization; Moisture content; Optimization algorithms; Radar; Soil moisture; Soil sciences; Soil water; soil water content; Synthetic data; Thickness; Travel time; Vadose water; vadose zone; Water content; waveform inversion; Waveforms; France
• ISSN: 2072-4292; 2072-4292
• DOI: 10.3390/rs17081436

Ground-penetrating radar (GPR) has emerged as a promising technology for estimating the soil water content (SWC) in the vadose zone. However, most current studies focus on partial GPR data, such as travel-time or amplitude, to achieve SWC estimation. Full waveform inversion (FWI) can produce more accurate results than inversion based solely on travel-time. However, it is subject to local minima when using a local optimization algorithm. In this paper, we propose a novel and powerful GPR waveform inversion scheme based on Harris hawks optimization (HHO) algorithm. The proposed strategy is tested on synthetic data, as well as on field experimental data. To further validate our approach, the results of the HHO algorithm are also compared with those of partial swarm optimization (PSO) and grey wolf optimizer (GWO). The inversion results from both synthetic and real experimental data demonstrate that the proposed inversion scheme can efficiently invert both SWC and layer thicknesses, thus achieving very fast convergence. These findings further confirm that the HHO algorithm can be effectively applied for the quantitative interpretation of GPR data.