Measuring Soil Water Content with Ground Penetrating Radar: A Review

Abstract

termines the diurnal evolution of the atmospheric boundary layer (Callies et al., 1998) . Currently, there is a needWe present a comprehensive review of methods to measure soil to establish and quantify the contribution of soil water water content with ground penetrating radar (GPR). We distinguish content-regulated land-atmosphere coupling to regional

Experimental estimation of the GPR groundwave sampling depth

“…The validity of this approach was determined by verifying that the velocities measured using the main groundwave trough and using other portions of the groundwave wavelet were equal in surveys where the entire groundwave wavelet was free from superposition. Huisman et al [2003] also showed that picking different portions of the groundwave wavelet provided the same velocity.…”

“…Thus, adequate characterization of the spatial and temporal heterogeneity of soil water content at the field scale is very difficult [Western and Grayson, 1998]. Several researchers have shown that ground-penetrating radar (GPR) groundwave techniques have potential for estimating the nearsurface soil water content [Chanzy et al, 1996;Lesmes et al, 1999;Huisman et al, 2001;Hubbard et al, 2002;Galagedara et al, 2003;Grote et al, 2003;Huisman et al, 2003;Galagedara et al, 2004;Galagedara et al, 2005a]. High-resolution GPR groundwave data can be acquired over several acres in a few hours, so GPR techniques have the potential to greatly improve spatial and temporal characterization of soil water content at the field scale.…”

“…Since the electromagnetic field at an interface must have continuity, the wavefront in air creates a lateral wave (C in Figure 1) in the soil, and similarly the wavefront in the soil creates the evanescent groundwave (D in Figure 1) in the air [Annan, 1973]. The groundwave travels at the same velocity as the spherical wavefront in the soil [Berktold et al, 1998], but the amplitude of the groundwave decreases rapidly with distance from the soil-air interface [Huisman et al, 2003].…”

“…Other researchers have suggested that the sampling depth depends on the wavelength (l), where l = v/f, but is not affected by S [Du, 1996, as cited by Huisman et al, 2003;Sperl, 1999, as cited by Galagedara et al, 2005b;Galagedara et al, 2005b]. Du [1996] suggested that the sampling depth ranges from a half wavelength to a full wavelength, whereas Sperl [1999] performed a modeling exercise that suggested that the sampling depth can be approximated as follows:…”

Uso do atributo amplitude instantânea do dado gpr na avaliação do teor de umidade de solos e sedimentos

“…Nessas aplicações, o método GPR, na maioria das vezes, se utiliza do registro da onda refletida na interface com a zona saturada ou entre estratos com diferentes propriedades elétricas, normalmente empregando arranjos CMP -Common Mid Point (Huisman et al, 2003), que consomem muito tempo na aquisição e não permitem a obtenção de seções contínuas.…”