High-resolution space–time quantification of soil moisture along a hillslope using joint analysis of ground penetrating radar and frequency domain reflectometry data

Tran, Anh Phuong; Bogaert, Pierre-Maurice; Wiaux, François; Vanclooster, Marnik; Lambot, Sébastien

doi:10.1016/j.jhydrol.2015.01.065

Cited by 39 publications

(23 citation statements)

References 51 publications

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“…This is in agreement with recent studies (e.g. Maier et al, 2011;Schmidt et al, 2011;Ball, 2013; also illustrated by Tran et al, 2015) that show that soil physical properties are key to understanding the mechanisms regulating the soil gases emissions. Our study brings new insights by demonstrating the strong linkages between soil physical properties and CO 2 emissions based on in situ and depth-explicit observations.…”

Section: Biogeosciencessupporting

confidence: 93%

“…7), as it is well known that VWC negatively impacts soil CO 2 emis- sions (e.g. Webster et al, 2008b;Perrin et al, 2012;Wiaux et al, 2014b; also illustrated by Tran et al, 2015). More precisely, we suggest that VWC is not the only factor controlling CO 2 emissions at the footslope, but that the difference between the VWC and the water saturation level of the soil pore spaces, i.e.…”

Section: Soil Physical Control On Co 2 Emissionssupporting

confidence: 61%

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Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

2015

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Abstract. In this study we aim to elucidate the role of physical conditions and gas transfer mechanism along soil profiles in the decomposition and storage of soil organic carbon (OC) in subsoil layers. We use a qualitative approach showing the temporal evolution and the vertical profile description of CO 2 fluxes and abiotic variables. We assessed soil CO 2 fluxes throughout two contrasted soil profiles (i.e. summit and footslope positions) along a hillslope in the central loess belt of Belgium. We measured the time series of soil temperature, soil moisture and CO 2 concentration at different depths in the soil profiles for two periods of 6 months. We then calculated the CO 2 flux at different depths using Fick's diffusion law and horizon specific diffusivity coefficients. The calculated fluxes allowed assessing the contribution of different soil layers to surface CO 2 fluxes. We constrained the soil gas diffusivity coefficients using direct observations of soil surface CO 2 fluxes from chamber-based measurements and obtained a good prediction power of soil surface CO 2 fluxes with an R 2 of 92 %.We observed that the temporal evolution of soil CO 2 emissions at the summit position is mainly controlled by temperature. In contrast, at the footslope, we found that long periods of CO 2 accumulation in the subsoil alternates with short peaks of important CO 2 release. This was related to the high water filled pore space that limits the transfer of CO 2 along the soil profile at this slope position. Furthermore, the results show that approximately 90 to 95 % of the surface CO 2 fluxes originate from the first 10 cm of the soil profile at the footslope. This indicates that soil OC in this depositional context can be stabilized at depth, i.e. below 10 cm. This study highlights the need to consider soil physical properties and their dynamics when assessing and modeling soil CO 2 emissions. Finally, changes in the physical environment of depositional soils (e.g. longer dry periods) may affect the long-term stability of the large stock of easily decomposable OC that is currently stored in these environments.

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Section: Biogeosciencessupporting

confidence: 93%

Section: Soil Physical Control On Co 2 Emissionssupporting

confidence: 61%

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

2015

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“…water, and organic matter content. All these features are strongly influenced by the parent material, climatic conditions, topography, and biological activity (Daniels, 2004;Tran et al, 2015;Forte & Pipan, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of Ground Penetrating Radar to Study Spatial Variability and Soil Stratigraphy

Campos

Vidal‐Torrado²,

Modolo

2019

Eng. Agríc.

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Ground Penetrating Radar (GPR) is a geophysical method that uses electromagnetic waves to study subsurface structure in different fields such as geology, agriculture and civil engineering. The wave penetration in the soil is strongly controlled by the electrical conductivity of soil components such as clay, organic matter, and water. In this study, tests were conducted in a floodplain in the Elizabeth Creek watershed (New Jersey-USA). We established one transect where measurements were completed using two techniques, common mid point (CMP) and constant offset profile (COP), both with 100-MHz frequency antennas. Measurements were also completed using 250 and 500 MHz shielded antennas. GPR showed good accuracy to study soil spatial variability and stratigraphy. Antennas of a higher frequency had less vertical investigation capacity and greater accuracy. In this study, it was not possible to clearly differentiate signals from organic matter and clay; this was the main limitation of the GPR system.

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“…Understanding the dynamics and transport of soil water content (θ) in thin mountain soils is essential for describing infiltration in superficial and deeper soil layers. Evaluation of the spatial and temporal distribution of θ is also crucial for assessing how recharge might vary with different locations in a mountain block [1,2]. Significant variations in θ depend on climatic forcing [3][4][5][6], soil properties, topography and vegetation [5,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Variations in Soil Water Content, Infiltration and Potential Recharge at Three Sites in a Mediterranean Mountainous Region of Baja California, Mexico

Toro-Guerrero

Vivoni

Kretzschmar

et al. 2018

Water

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In this research, we examined temporal variations in soil water content (θ), infiltration patterns, and potential recharge at three sites with different mountain block positions in a semiarid Mediterranean climate in Baja California, Mexico: two located on opposing aspects (south-(SFS) and north-facing slopes (NFS)) and one located in a flat valley. At each site, we measured daily θ between 0.1 and 1 m depths from May 2014 to September 2016 in four hydrological seasons: wet season (winter), dry season (summer) and two transition seasons. The temporal evolution of θ and soil water storage (SWS) shows a strong variability that is associated mainly with high precipitation (P) pulses and soil profile depth at hillslope sites. Results shows that during high-intensity P events sites with opposing aspects reveal an increase of θ at the soil-bedrock interface suggesting lateral subsurface fluxes, while vertical soil infiltration decreases noticeably, signifying the production of surface runoff. We found that the dry soil conditions are reset annually at hillslope sites, and water is not available until the next wet season. Potential recharge occurred only in the winter season with P events greater than 50 mm/month at the SFS site and greater than 120 mm/month at the NFS site, indicating that soil depth and lack of vegetation cover play a critical role in the transport water towards the soil-bedrock interface. We also calculate that, on average, around 9.5% (~34.5 mm) of the accumulated precipitation may contribute to the recharge of the aquifer at the hillslope sites. Information about θ in a mountain block is essential for describing the dynamics and movement of water into the thin soil profile and its relation to potential groundwater recharge.scales [10] with substantial variations observed with soil depth [11][12][13]. For instance, θ in different soil layers is influenced by the productivity of terrestrial plants with varying rooting depths [14][15][16].Precipitation pulses are a first-order control on the seasonal variation of θ during the hydrological year, in particular for semiarid regions characterized by long periods of no rainfall [9,17,18]. In semiarid Mediterranean climate systems, the seasonality of precipitation (P) leads to high water availability in the winter season when potential evapotranspiration is low [19]. Winter precipitation influences diffuse recharge processes through vertical infiltration occurring in the soil profile (e.g., [20][21][22][23]). In mountain systems within these settings, soil thickness is generally shallow leading to the potential for rapid flow into fractures that underlie the soil [24]. As a result, the shallow monitoring of θ and its spatiotemporal variability in response to P should yield inferences on potential recharge in mountain block systems.Mountain block systems often have spatial variations in vegetation mediated by topographic position. For instance, plant distributions in mid-latitude regions exhibit changes between pole-facing slopes and equator-facing slopes (i...

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High-resolution space–time quantification of soil moisture along a hillslope using joint analysis of ground penetrating radar and frequency domain reflectometry data

Cited by 39 publications

References 51 publications

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Vertical partitioning and controlling factors of gradient-based soil carbon dioxide fluxes in two contrasted soil profiles along a loamy hillslope

Use of Ground Penetrating Radar to Study Spatial Variability and Soil Stratigraphy

Variations in Soil Water Content, Infiltration and Potential Recharge at Three Sites in a Mediterranean Mountainous Region of Baja California, Mexico

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