Mapping agricultural fields with GPR and EMI to predict offsite movement of agrochemicals

Ronald E. Yoder; Robert S. Freeland; J. T. Ammons; L. L. Leonard

doi:10.1117/12.383565

27 April 2000 Mapping agricultural fields with GPR and EMI to predict offsite movement of agrochemicals

Ronald E. Yoder, Robert S. Freeland, J. T. Ammons, L. L. Leonard

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383565
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

Abstract

Offsite movement of waterborne agrochemicals is increasingly targeted as a nonpoint source of water quality degradation. Our research has indicated that subsurface water movement is variable and site-specific, and that a small soil volume frequently conducts a large volume of flow. This concentrated flow is usually caused by soil morphology, and it often results in water moving rapidly offsite from certain areas of fields; little or no lateral subsurface flow may occur in other areas. Identifying these subsurface regions is difficult using conventional soil survey and vadose zone sampling techniques. In this study, traditional surveying is combined with electromagnetic induction (EMI) and ground penetrating radar (GPR) mapping to identify areas with high potential for subsurface offsite movement of agrochemicals, optimizing these identification techniques, and expanding the mapping procedures to make them useful at the field-scale for agricultural production practices. Conclusions from this research are: (1) EMI mapping provides rapid identification of areas of soil with a high potential for offsite movement of subsurface water, (2) GPR mapping of areas identified by EMI mapping provides a means to identify features that are known to conduct concentrated lateral flow of water, and (3) combining the capabilities of EMI and GPR instrumentation make possible the surveys of large areas that would otherwise be impossible or unfeasible to characterize.

Citation Download Citation

Ronald E. Yoder, Robert S. Freeland, J. T. Ammons, and L. L. Leonard "Mapping agricultural fields with GPR and EMI to predict offsite movement of agrochemicals", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383565

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