Vadose Zone Modeling in a Small Forested Catchment: Impact of Water Pressure Head Sampling Frequency on 1D-Model Calibration

Belfort, Benjamin; Toloni, Ivan; Ackerer, Philippe; Cotel, Solenn; Viville, Daniel; Lehmann, François

doi:10.3390/geosciences8020072

Cited by 9 publications

(11 citation statements)

References 66 publications

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“…Five Watermark sensors, including a Campbell 257 for matrix potential and four Campbell 107 probes for temperature measurement, were installed with a sampling time step of 10 min. The collected data serve as conditioning information for modeling water motion through soils (Belfort et al, 2018; Biron, 1994).…”

Section: Project‐specific Studiesmentioning

confidence: 99%

The Strengbach Catchment: A Multidisciplinary Environmental Sentry for 30 Years

Pierret

Cotel

Ackerer

et al. 2018

Vadose Zone Journal

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Research activity associated with various observations at the Strengbach catchment in the Vosges Massif (880-1150 m) addresses many questions in the domains of hydrology and geochemistry. The catchment is the observation and experimental site of the Observatoire Hydro-Géochimique de l'Environnement appointed by the Centre National de la Recherche Scientifique. It also belongs to the research facilities that form the French Network of Critical Zone Observatories (OZCAR), which supports a network of critical zone observatories. The catchment is small (0.8 km 2 ) with steep slopes (20-30%) on granitic bedrock that mainly allow for forestry (spruce and beech stands) as the main land cover. Meteorological, hydrological, and geochemical data have been monitored since 1986. The first studies conducted were dedicated to the elucidation of acid rain effects on forest ecosystems and particularly on forest decline. Multidisciplinary research studies conducted on the Strengbach catchment enable exploration of the following issues: (i) hydrological functioning at the scale of a small catchment and questions regarding the evolution and preservation of the water resources in mountainous environments (stock, recharge, infiltration, and water pathways), (ii) exchange processes observed at the soil-plant-atmosphere continuum and in particular weathering processes and the evolution of soil mineral fertility (Ca, Mg, K, P), (iii) processes responsible for the export of water and for associated fluxes (dissolved chemicals, suspended materials, bed loads) and their dynamic at the outlet, and (iv) responses of the ecosystems to environmental disturbances (acid rain, forest management, and climate change) and their current and future modeling. University of Strasbourg), is well suited for addressing such issues owing to (i) a long-term dataset available for the area (from 1985;Probst et al., 1987), (ii) the availability of field equipment and monitoring devices, and (iii) numerous scientific studies that have been performed on the area. Research performed at this catchment, which is located in the Vosges Mountains in northeastern France, has focused on the evaluation of water and soil resources in relation to climatic changes (i.e., rainfall regimes and atmospheric chemistry trends) and anthropogenic patterns (e.g., forest management and acid precipitation) occurring in this moderate-altitude mountainous region.Usually, in this type of ecosystem, water is scarce and not evenly distributed, and stocks may rapidly vary over time. In addition, although wood production is an economically important activity in these regions, soil degradation (e.g., from acidification and nutrient depletion) modifies soil fertility features and thus affects the development of forests.The scientific objective of the OHGE is to develop a detailed understanding of water transport processes and of related chemical fluxes (including nutrients and contaminants) through the critical zone extending from the near atmosphere to the near subsurface. The main purposes of...

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Section: Project‐specific Studiesmentioning

confidence: 99%

The Strengbach Catchment: A Multidisciplinary Environmental Sentry for 30 Years

Pierret

Cotel

Ackerer

et al. 2018

Vadose Zone Journal

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“…The hydrogeological model uses the WAMOS-1D code (Belfort et al 2018) which combines the Richards equation in 1D with the Mualemvan Genuchten (MvG) model to describe the constitutive relationships between the pressure, the hydraulic conductivity and the water content. The head applied in the infiltration tank and the water table level are respectively set as the top and the bottom boundary conditions.…”

Section: Methodsmentioning

confidence: 99%

Ground Penetrating Radar Two-Way Travel Time Sensitivity to Hydrodynamic Parameters During Soil Water Infiltration

Rohianuu

Girard

Lesparre

et al. 2021

NSG2021 1st Conference on Hydrogeophysics

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“…The variation of the water content in the soil during the infiltration is computed using the WAMOS-1D code (Belfort et al, 2018). The model describes the water movement in the porous medium using Richards' equation ( 1), and the constitutive relationships between the pressure, the hydraulic conductivity, and the volumetric water content given by Eq.…”

Section: The Numerical Modelmentioning

confidence: 99%

On the interest of ground penetrating radar data for the estimation of unsaturated soil parameters

Moua

Lesparre²,

Girard³

et al. 2022

Preprint

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Abstract. In this study, the interest of ground penetrating radar (GPR) time-lapse measurements for the estimation of hydrodynamic unsaturated soil parameters is investigated using synthetic infiltration experiments. Water movement and electromagnetic wave propagation in the unsaturated zone are modeled using a one-dimensional hydrogeophysical model. The GPR travel time data are analyzed for different reflectors: a moving reflector (the infiltration wetting front) and three fixed reflectors located at different depths in the soil. Global sensitivity analysis (GSA) is employed to assess the influence of the saturated hydraulic conductivity, the saturated and residual water contents, and the Mualem–van Genuchten shape parameters α and n of the soil on the GPR travel time data of the reflectors. Statistical calibration of the soil parameters is then performed using the Markov chain Monte Carlo (MCMC) method. The impact of the type of reflector (moving or fixed) is then evaluated by analyzing the calibrated model parameters and their confidence intervals for different scenarios. GSA results show that the sensitivities of the moving and fixed reflectors data to the hydrodynamic soil parameters are different whereas the fixed reflectors have similar sensitivities. Results of parameter estimation show that the use of only data from the moving or fixed reflectors does not allow a good identification of all soil parameters. When both data are combined, all soil parameters can be well estimated with narrow confidence intervals.

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Vadose Zone Modeling in a Small Forested Catchment: Impact of Water Pressure Head Sampling Frequency on 1D-Model Calibration

Cited by 9 publications

References 66 publications

The Strengbach Catchment: A Multidisciplinary Environmental Sentry for 30 Years

The Strengbach Catchment: A Multidisciplinary Environmental Sentry for 30 Years

Ground Penetrating Radar Two-Way Travel Time Sensitivity to Hydrodynamic Parameters During Soil Water Infiltration

On the interest of ground penetrating radar data for the estimation of unsaturated soil parameters

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