A Seven‐Year Water Balance Study of an Evapotranspiration Landfill Cover Varying in Slope for Semiarid Regions

Nyhan, J.W.

doi:10.2136/vzj2003.0159

Cited by 34 publications

(20 citation statements)

References 48 publications

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“…A particular challenge is the development of a soil‐like profile in the engineered barrier that alters its relevant physical, hydrological, chemical, and biological properties thereby altering their required performance. For that purpose, long‐terms field experiments of years to decades (Albright et al, 2004; Nyhan, 2005) must be combined with natural or archaeological analogs (e.g., burial tombs) to benchmark conceptual and mathematical models. To deal with extremely long time scales, models should be able to incorporate long‐term changes in climate, landforms, and other relevant boundary conditions.…”

Section: Soil Modeling and Ecosystem Servicesmentioning

confidence: 99%

“…For that purpose, long-terms field experiments of years to decades (Albright et al, 2004;Nyhan, 2005) must be combined with natural or archaeological analogs (e.g., burial tombs) to benchmark conceptual and mathematical models. To deal with extremely long time scales, models should be able to incorporate long-term changes in climate, landforms, and other relevant boundary conditions.…”

Section: Recycling Of Anthropogenic Wastementioning

confidence: 99%

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Modeling Soil Processes: Review, Key Challenges, and New Perspectives

Vereecken

Schnepf

Hopmans

et al. 2016

Vadose Zone Journal

526

394

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The remarkable complexity of soil and its importance to a wide range of ecosystem services presents major challenges to the modeling of soil processes. Although major progress in soil models has occurred in the last decades, models of soil processes remain disjointed between disciplines or ecosystem services, with considerable uncertainty remaining in the quality of predictions and several challenges that remain yet to be addressed. First, there is a need to improve exchange of knowledge and experience among the different disciplines in soil science and to reach out to other Earth science communities. Second, the community needs to develop a new generation of soil models based on a systemic approach comprising relevant physical, chemical, and biological processes to address critical knowledge gaps in our understanding of soil processes and their interactions. Overcoming these challenges will facilitate exchanges between soil modeling and climate, plant, and social science modeling communities. It will allow us to contribute to preserve and improve our assessment of ecosystem services and advance our understanding of climate-change feedback mechanisms, among others, thereby facilitating and strengthening communication among scientific disciplines and society. We review the role of modeling soil processes in quantifying key soil processes that shape ecosystem services, with a focus on provisioning and regulating services. We then identify key challenges in modeling soil processes, including the systematic incorporation of heterogeneity and uncertainty, the integration of data and models, and strategies for effective integration of knowledge on physical, chemical, and biological soil processes. We discuss how the soil modeling community could best interface with modern modeling activities in other disciplines, such as climate, ecology, and plant research, and how to weave novel observation and measurement techniques into soil models. We propose the establishment of an international soil modeling consortium to coherently advance soil modeling activities and foster communication with other Earth science disciplines. Such a consortium should promote soil modeling platforms and data repository for model development, calibration and intercomparison essential for addressing contemporary challenges.

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Section: Soil Modeling and Ecosystem Servicesmentioning

confidence: 99%

Section: Recycling Of Anthropogenic Wastementioning

confidence: 99%

Modeling Soil Processes: Review, Key Challenges, and New Perspectives

Vereecken

Schnepf

Hopmans

et al. 2016

Vadose Zone Journal

526

394

View full text Add to dashboard Cite

show abstract

“…The performance of the capillary barrier has been investigated using laboratory experiments, numerical modelling, and field tests. Field instrumentation results indicated that a capillary barrier works in small plot (Nyhan et al 1997;Nyhan 2005). It is often found that for larger plots, the accumulated lateral diversion overwhelmed the lateral diversion capacity of the capillary barrier system and as a result, water infiltrated into the waste layer (Stormont 1996).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on dual capillary barrier using recycled asphalt pavement materials

Rahardjo

2014

Can. Geotech. J.

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The performance of a capillary barrier cover as a cover system is affected by the ability of the capillary barrier to store water. To increase the water storage of a capillary barrier cover, the dual capillary barrier (DCB) concept is proposed. The objective of this paper is to investigate the water storage of the proposed DCB as compared to the storage of a traditional single capillary barrier (SCB). The investigation is conducted using two one-dimensional infiltration column tests under different rainfall conditions. The results show that a DCB stores more water as compared to SCB. The results show that the fine-grained layers of a DCB have higher volumetric water contents during drainage as compared to that of the fine-grained layer of an SCB. The higher volumetric water content is caused by the fact that the thickness of the layers in a DCB corresponds to a pore-water pressure head range where the material has the highest volumetric water content. In addition, a slower drainage rate is resulted from additional layering in a DCB. Résumé :La performance d'une couverture à effets de barrière capillaire en tant que système de recouvrement est affectée par la capacité de la barrière capillaire à stocker l'eau. Afin d'augmenter le stockage d'eau dans une couverture à effets de barrière capillaire, le concept de double barrière capillaire (DCEBC) est proposé. L'objectif de cet article est d'étudier le stockage de l'eau dans la DCEBC proposée en comparaison avec le stockage d'une simple barrière capillaire (CEBC) traditionnelle. Les investigations sont réalisées à l'aide de deux essais en colonne d'infiltration unidimensionelle soumis à différentes conditions de précipitations. Les résultats démontrent que la DCEBC stocke plus d'eau comparativement à la CEBC. Les résultats montrent que les couches fines de la DCEBC ont des teneurs en eau volumiques plus élevées durant le drainage par rapport à la couche fine de la CEBC. La teneur en eau volumique plus élevée est causée par le fait que l'épaisseur des couches dans la DCEBC correspond à l'étendue des pressions interstitielles où le matériel a la teneur en eau volumique la plus élevée. De plus, un taux de drainage plus faible est obtenu avec l'ajout d'une couche dans la DCEBC. [Traduit par la Rédaction] Mots-clés : stockage d'eau, double barrière capillaire, colonne d'infiltration, teneur en eau volumique, asphalte recycle.

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“…This limits the passage of infiltrating water, which is held in the MRL by capillary forces (Parent and Cabral, 2006). Several experimental tests have been conducted to investigate the behaviour of capillary barrier systems under different conditions (Walter et al, 2000;Albright et al, 2004;Yang et al, 2004;Nyhan, 2005). In addition, numerical modelling has been used to predict the performance of capillary barrier systems and the influence of such factors as material selection and layer thickness (Oldenburg and Pruess, 1993;Morris and Stormont, 1998;Berger, 2000;Wu et al, 2002;Fala et al, 2005;Parent and Cabral, 2006).…”

Section: Introductionmentioning

confidence: 99%

Influence of soil moisture hysteresis on the functioning of capillary barriers

Zhang

Werner

Aviyanto

et al. 2009

Hydrological Processes

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Abstract:Previous experimental studies of capillary barriers have identified highly hysteretic soil moisture retention characteristics in the materials used. In this study, numerical modelling is used to analyse the role of soil moisture hysteresis in capillary barrier functioning. Comparisons between published experimental results and model simulations indicate that soil moisture hysteresis was a necessary inclusion in the modelling approach to adequately reproduce pore water pressure distributions and the timing of breakthrough occurrences. Under hypothetical intermittent infiltration and evaporation conditions, the predicted volumetric water content in the moisture retention layer was significantly different for hysteretic and non-hysteretic models. The hysteresis effect was found to be dependent on the nature of infiltration-evaporation cycling, although the predicted volume of flow through the hysteretic barrier was lower than that of the non-hysteretic case, regardless of the nature of the cyclic upper boundary conditions. For practical engineering designs, where the water leakage through the barrier is the primary concern, the inclusion of soil moisture hysteresis in numerical modelling is needed.

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A Seven‐Year Water Balance Study of an Evapotranspiration Landfill Cover Varying in Slope for Semiarid Regions

Cited by 34 publications

References 48 publications

Modeling Soil Processes: Review, Key Challenges, and New Perspectives

Modeling Soil Processes: Review, Key Challenges, and New Perspectives

Experimental study on dual capillary barrier using recycled asphalt pavement materials

Influence of soil moisture hysteresis on the functioning of capillary barriers

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