9
2
Advanced GroundPenetrating Radar for
Soil Moisture Retrieval
Julien Minet, Khan Zaib Jadoon, François Jonard,
Mohammad Reza Mahmoudzadeh,
Phuong Anh Tran, and Sébastien Lambot
2.1 INTRODUCTION
Soil moisture plays an important role in many environmental, agricultural, hydrologic, and climatic processes. In hydrology, soil moisture governs the partitioning
of rainfall into runoff and infiltration, and neglecting its variability largely impacts
on the prediction of solute leaching, erosion, runoff, and evaporation. In agriculture
and irrigation applications, soil moisture is a crucial factor controlling plant growth
and germination, particularly when saline stress is encountered. Knowing spatiotemporal distribution of soil moisture and soil water storage capacity is therefore an
important asset for the optimization of irrigation under a variable environment. Soil
moisture also exerts a strong control on soil biogeochemistry, especially with respect
CONTENTS
2.1 Introduction ...................................................................................................... 9
2.2 Soil Moisture Sensing by Ground-Penetrating Radar .................................... 11
2.3 Full-Waveform Inversion of GPR Data .......................................................... 12
2.3.1 Modeling of the GPR System ............................................................. 13
2.3.2 Inversion of GPR Data ....................................................................... 14
2.3.3 Petrophysical Relationships ................................................................ 15
2.4 Validation and Applications ........................................................................... 16
2.4.1 Mapping of Soil Moisture in Agricultural Fields ............................... 16
2.4.2 Comparison with the Direct Ground-Wave Method .......................... 19
2.4.3 Comparison with Ground-Based Radiometry ....................................20
2.4.4 Soil Moisture Profile Characterization ............................................... 22
2.4.5 Time-Lapse GPR Monitoring ............................................................. 23
2.4.6 Temporal Stability of Soil Moisture Patterns .....................................25
2.5 Conclusions ....................................................................................................26
Acknowledgments ................................................................................................... 27
References ............................................................................................................... 27
2
Advanced GroundPenetrating Radar for
Soil Moisture Retrieval
Julien Minet, Khan Zaib Jadoon, François Jonard,
Mohammad Reza Mahmoudzadeh,
Phuong Anh Tran, and Sébastien Lambot
2.1 INTRODUCTION
Soil moisture plays an important role in many environmental, agricultural, hydrologic, and climatic processes. In hydrology, soil moisture governs the partitioning
of rainfall into runoff and infiltration, and neglecting its variability largely impacts
on the prediction of solute leaching, erosion, runoff, and evaporation. In agriculture
and irrigation applications, soil moisture is a crucial factor controlling plant growth
and germination, particularly when saline stress is encountered. Knowing spatiotemporal distribution of soil moisture and soil water storage capacity is therefore an
important asset for the optimization of irrigation under a variable environment. Soil
moisture also exerts a strong control on soil biogeochemistry, especially with respect
CONTENTS
2.1 Introduction ...................................................................................................... 9
2.2 Soil Moisture Sensing by Ground-Penetrating Radar .................................... 11
2.3 Full-Waveform Inversion of GPR Data .......................................................... 12
2.3.1 Modeling of the GPR System ............................................................. 13
2.3.2 Inversion of GPR Data ....................................................................... 14
2.3.3 Petrophysical Relationships ................................................................ 15
2.4 Validation and Applications ........................................................................... 16
2.4.1 Mapping of Soil Moisture in Agricultural Fields ............................... 16
2.4.2 Comparison with the Direct Ground-Wave Method .......................... 19
2.4.3 Comparison with Ground-Based Radiometry ....................................20
2.4.4 Soil Moisture Profile Characterization ............................................... 22
2.4.5 Time-Lapse GPR Monitoring ............................................................. 23
2.4.6 Temporal Stability of Soil Moisture Patterns .....................................25
2.5 Conclusions ....................................................................................................26
Acknowledgments ................................................................................................... 27
References ............................................................................................................... 27