Operational validation of HYDRUS (2D/3D) for capillary barriers using data of a 10-m tipping trough

Berger, Klaus

doi:10.1515/johh-2017-0059

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Simultaneously, it can make the suction force of saturated soil zero, which is in line with the characteristics of soil suction force change during the process of moisture absorption. Considering the soil's nature for this research, which is high clay content [39], therefore, the van Genuchten model is more suitable than another model [57,58]. The expression is:…”

Section: Calibration and Validationmentioning

confidence: 99%

Influence of Gully Land Consolidation on Phreatic Water Transformation in the Loess Hilly and Gully Region

Guo

Gao

Sun

et al. 2021

Water

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Gully Land Consolidation (GLC) is a proven method to create farmlands and increase crop yields in the Loess Hilly and Gully Region, China. However, GLC influences phreatic water transformation and might cause the farmlands water disasters, such as salinization and swamping. For exploring the influence of GLC on phreatic water transformation and mitigating disasters, a series of indoor experiments were conducted in the artificial rainfall hall. Then, we simulated the phreatic water transformation patterns under more conditions with HYDRUS-3D. Finally, an engineering demonstration in the field was performed to validate our research. The indoor experiments indicated that GLC could increase phreatic water outflow rate 4.39 times and phreatic water coefficient (PWC) 2.86 times with a considerable delay. After calibration and validation with experimental data, the HYDRUS-3D was used to simulate phreatic water transformation under more soil thickness and rainfall intensities. Accordingly, we summarized the relationship among PWC, rainfall intensities, and soil thickness, and therefore suggested a blind ditch system to alleviate farmlands disasters. Field application showed that a blind ditch system could avoid disasters with 3.2 times the phreatic water transformation rate compared to loess. Our research provides implications for sustainable land uses and management in the region with thick soil covers.

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Section: Calibration and Validationmentioning

confidence: 99%

Influence of Gully Land Consolidation on Phreatic Water Transformation in the Loess Hilly and Gully Region

Guo

Gao

Sun

et al. 2021

Water

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“…The flow equation incorporates a sink term to account for water uptake by plant roots (Šimůnek et al., 2012). HYDRUS has been used for modeling flow in the vegetated surface covers (e.g., Berger, 2017, 2018; Guedessou et al., 2021; Ogorzalek et al., 2008; Wongkaew et al., 2018; Yasser et al., 2012). However, numerical convergence of water balance may occur for relatively coarse soils under long‐term realistic hydrologic conditions (Sage et al., 2000).…”

Section: Introductionmentioning

confidence: 99%

Delineating soil moisture dynamics within an evapotranspiration surface barrier using spatial‐temporal analysis

Zhang¹,

Mehta²,

Bergeron

2023

Vadose Zone Journal

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Evapotranspiration (ET) surface barriers store infiltrated precipitation during the recharge period and release the stored water to the atmosphere via ET. The primary purpose of a surface barrier is to reduce or eliminate drainage to the underlying waste zone. The objective of this study is to analyze the spatial and temporal dynamics of soil moisture within an ET surface barrier based on observed and simulated data. This study characterizes the water movement processes using contour plots of soil moisture content and flux rate in the depth‐time domain. Zero‐flux planes (ZFPs) divide the depth‐time domain into stored water, ET, and drainage zones. Some flow dynamics (e.g., flow rate and direction) that were not observed in the field were elaborated with simulation results to identify the depth of the recharge front of infiltrated water, the release front of stored water, and the bottom of the ET zone. The ET‐drainage divide marks the bottom of the ET zone and the top of the drainage zone. The results showed that the temporal analysis of soil moisture storage could indicate the degree of usage of the storage capacity of a surface barrier. The spatial‐temporal analyses of soil moisture content and flux rate can characterize the durations of the recharge/release processes and the depth of the stored water. Quantification of these processes and related zones provides beneficial understanding of the state and dynamics of soil moisture for a range of weather and vegetation conditions and is useful in optimizing the design of an ET surface barrier.

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Operational validation of HYDRUS (2D/3D) for capillary barriers using data of a 10-m tipping trough

Berger

2018

Journal of Hydrology and Hydromechanics

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Capillary barriers are an interesting alternative component for cover systems of landfills and contaminated sites. Provided they are sufficiently validated, soil hydrological models could be fast and powerful tools for the dimensioning of capillary barriers. Outflow rates measured in a 10 m long tipping trough for one material combination and two slopes from stationary periods were compared to simulation results of HYDRUS (2D/3D), Version 2.05. The measured outflow rates show a typical pattern with slope-dependent threshold values indicating the efficiency of the capillary barrier. This flow pattern could not be reproduced with HYDRUS (2D/3D) that for different input setups produced smooth patterns without thresholds. The input setup was varied for different soil hydraulic models (van Genuchten-Mualem vs. Brooks-Corey), homogeneous and heterogeneous transport domains (no scaling vs. stochastically distributed scaling factors considering the Miller-Miller similitude), different HYDRUS versions (standard vs. alternative; i.e., with material properties assigned either to finite element nodes or finite elements, respectively), and different lower boundary conditions (seepage face vs. free drainage). Differences between measured and simulated outflow patterns could be caused by the measurements, the application of the model, or by the model itself. The van Genuchten-Mualem model may not be suitable to describe the soil hydrological relationships of these particular materials. The reason for the mismatch, however, could not be identified yet.

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Operational validation of HYDRUS (2D/3D) for capillary barriers using data of a 10-m tipping trough

Cited by 3 publications

References 13 publications

Influence of Gully Land Consolidation on Phreatic Water Transformation in the Loess Hilly and Gully Region

Influence of Gully Land Consolidation on Phreatic Water Transformation in the Loess Hilly and Gully Region

Delineating soil moisture dynamics within an evapotranspiration surface barrier using spatial‐temporal analysis

Operational validation of HYDRUS (2D/3D) for capillary barriers using data of a 10-m tipping trough

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