Reclamation for aspen revegetation in the Athabasca oil sands: Understanding soil water dynamics through unsaturated flow modelling

2012 ◽  
Vol 92 (1) ◽  
pp. 103-116 ◽  
Author(s):  
J. J. Carrera-Hernández ◽  
C. A. Mendoza ◽  
K. J. Devito ◽  
R. M. Petrone ◽  
B. D. Smerdon
Keyword(s):  
Soil Water ◽  
Water Table ◽  
Oil Sands ◽  
Unsaturated Flow ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Natural Conditions ◽  
Athabasca Oil Sands ◽  
Flow Modelling ◽  
The Impact

Carrera-Hernández, J. J., Mendoza, C. A., Devito, K. J., Petrone, R. M. and Smerdon, B. D. 2012. Reclamation for aspen revegetation in the Athabasca oil sands: Understanding soil water dynamics through unsaturated flow modelling. Can. J. Soil Sci. 92: 103–116. Reclamation of mined areas in the Athabasca oil sands region is required by law, with the ultimate goal of revegetating to species characteristic of predisturbance native plant communities. To develop adequate reclamation strategies, an analysis of soil water dynamics is of utmost importance, as is understanding the impact of the thickness of the reclamation cover. In this work, soil water dynamics and fluxes at the water table were simulated for three reclamation scenarios and compared with the fluxes obtained for natural conditions assuming that aspen is the target reclamation species. According to the simulations, a reclamation thickness between 0.5 and 1.0 m can be used to provide water for revegetation. The numerical simulations show that the reclaimed landscapes have fluxes at the water table that exhibit less fluctuation than natural conditions. To limit the interaction between the water table and atmospheric fluxes, and to limit upward flux, the water table should be deeper than 2.0 m on reclaimed landscapes that use aspen for revegetation, particularly when reclamation takes place during a dry climatological cycle.

scholarly journals Nitrogen and Rainfall Effects on Crop Growth—Experimental Results and Scenario Analyses

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2219
Author(s):  
Saadi Sattar Shahadha ◽  
Ole Wendroth ◽  
Dianyuan Ding
Keyword(s):  
Soil Water ◽  
Application Rate ◽  
Crop Growth ◽  
Water Dynamics ◽  
Nitrogen Application ◽  
Soil Water Dynamics ◽  
Application Rates ◽  
Use Efficiency ◽  
The Impact ◽  
Nitrogen Application Rate

Nitrogen (N) fertilization is critical for crop growth; however, its effect on crop growth and evapotranspiration (ETc) behaviors under different amounts of rainfall is not well understood. As such, there is a need for studying the impact of nitrogen application rates and rainfall amounts on crop growth and ETc components. Agricultural system models help to fill this knowledge gap, e.g., the Root Zone Water Quality Model (RZWQM2), which integrates crop growth-related processes. The objective of this study is to investigate the effect of the nitrogen application rate on crop growth, soil water dynamics, and ETc behavior under different rainfall amounts by using experimental data and the RZWQM2. A field study was conducted from 2016 to 2019 with three nitrogen application rates (0, 70 and 130 kg N ha−1) for unirrigated winter wheat (Triticum aestivum L.), and two nitrogen application rates (0 and 205 kg N ha−1) for unirrigated corn (Zea mays L.). For the period of 1986–2019, the amounts of actual rainfall during each crop growth period are categorized into four groups. Each rainfall group is used as a rainfall scenario in the RZWQM2 to explore the interactions between the rainfall amounts and N levels on the resulting crop growth and water status. The results show that the model satisfactorily captures the interaction effects of nitrogen application rates and rainfall amounts on the daily ETc and soil water dynamics. The nitrogen application rate showed a noticeable impact on the behavior of soil water dynamics and ETc components. The 75% rainfall scenario yielded the highest nitrogen uptake for both crops. This scenario revealed the highest water consumption for wheat, while corn showed the highest water uptake for the 100% rainfall scenario. The interaction between a high nitrogen level and 50% rainfall yielded the highest water use efficiency, while low nitrogen and 125% rainfall yielded the highest nitrogen use efficiency. A zero nitrogen rate yielded the highest ETc and lowest soil water content among all treatments. Moreover, the impacts of the nitrogen application rate on ETc behavior, crop growth, and soil water dynamics differed depending on the received rainfall amount.

scholarly journals Soil Water Dynamics of Shallow Water Table Soils Cultivated With Potato Crop

2018 ◽  
Vol 17 (1) ◽  
pp. 180077 ◽  
Author(s):  
Andre Luiz Biscaia Ribeiro da Silva ◽  
Heraldo T. Hashiguti ◽  
Lincoln Zotarelli ◽  
Kati W. Migliaccio ◽  
Michael D. Dukes
Keyword(s):  
Shallow Water ◽  
Soil Water ◽  
Water Table ◽  
Potato Crop ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Shallow Water Table

Comparison between Soil Water Dynamics Simulated by the Isothermal and Non-Isothermal Models

2013 ◽  
Vol 864-867 ◽  
pp. 2298-2301
Author(s):  
Jiang Bo Han ◽  
Zhi Fang Zhou
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Table ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Isothermal Model ◽  
Dynamic Variations ◽  
Soil Temperatures ◽  
One Year

To obtain a better understanding of the role of non-isothermal flow in the unsaturated zone in the presence of the water table, the isothermal and non-isothermal models driven by the observed atmospheric data were used to reproduce soil moisture dynamics observed in the lysimeter with a 100-cm water table level over one year period. Results from the simulations indicated that although the isothermal and non-isothermal models both captured the general trend of soil water content dynamics during one year period, simulated values by the isothermal model presented less dynamic variations, which overestimated the soil water content during the rainy season and underestimated it during other periods. On the other hand, the non-isothermal model not only reproduced well the seasonal variations of soil temperatures but also reproduced more reasonably soil water dynamics in the whole profile and during the whole simulation period.

scholarly journals The effect of different evapotranspiration methods on portraying soil water dynamics and ET partitioning in a semi-arid environment in Northwest China

2016 ◽  
Vol 20 (3) ◽  
pp. 975-990 ◽  
Author(s):  
Lianyu Yu ◽  
Yijian Zeng ◽  
Zhongbo Su ◽  
Huanjie Cai ◽  
Zhen Zheng
Keyword(s):  
Growth Rate ◽  
Soil Water ◽  
Growing Season ◽  
Soil Evaporation ◽  
Water Dynamics ◽  
Rooting Depth ◽  
Crop Evapotranspiration ◽  
Soil Water Dynamics ◽  
The Impact ◽  
Root Growth Rate

Abstract. Different methods for assessing evapotranspiration (ET) can significantly affect the performance of land surface models in portraying soil water dynamics and ET partitioning. An accurate understanding of the impact a method has is crucial to determining the effectiveness of an irrigation scheme. Two ET methods are discussed: one is based on reference crop evapotranspiration (ET0) theory, uses leaf area index (LAI) for partitioning into soil evaporation and transpiration, and is denoted as the ETind method; the other is a one-step calculation of actual soil evaporation and potential transpiration by incorporating canopy minimum resistance and actual soil resistance into the Penman–Monteith model, and is denoted as the ETdir method. In this study, a soil water model, considering the coupled transfer of water, vapor, and heat in the soil, was used to investigate how different ET methods could affect the calculation of the soil water dynamics and ET partitioning in a crop field. Results indicate that for two different ET methods this model varied concerning the simulation of soil water content and crop evapotranspiration components, but the simulation of soil temperature agreed well with lysimeter observations, considering aerodynamic and surface resistance terms improved the ETdir method regarding simulating soil evaporation, especially after irrigation. Furthermore, the results of different crop growth scenarios indicate that the uncertainty in LAI played an important role in estimating the relative transpiration and evaporation fraction. The impact of maximum rooting depth and root growth rate on calculating ET components might increase in drying soil. The influence of maximum rooting depth was larger late in the growing season, while the influence of root growth rate dominated early in the growing season.

scholarly journals Testing the EPIC Richards submodel for simulating soil water dynamics under different bottom boundary conditions

2021 ◽  
Author(s):  
Matteo Longo ◽  
Curtis Dinnen Jones ◽  
Roberto César Izaurralde ◽  
Miguel L. Cabrera ◽  
Nicola Dal Ferro ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Soil Water ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Bottom Boundary

Numerical routine for soil water dynamics from trickle irrigation

2020 ◽  
Vol 83 ◽  
pp. 371-385 ◽  
Author(s):  
Ángel del Vigo ◽  
Sergio Zubelzu ◽  
Luis Juana
Keyword(s):  
Soil Water ◽  
Water Dynamics ◽  
Trickle Irrigation ◽  
Soil Water Dynamics

scholarly journals Analysis of Soil Water Response to Grass Transpiration

2013 ◽  
Vol 1 (No. 3) ◽  
pp. 85-98
Author(s):  
Dohnal Michal ◽  
Dušek Jaromír ◽  
Vogel Tomáš ◽  
Herza Jiří
Keyword(s):  
Soil Water ◽  
Water Uptake ◽  
Preferential Flow ◽  
Water Movement ◽  
Control Volume ◽  
Water Pressure ◽  
Lower Boundary ◽  
Root Water Uptake ◽  
Water Dynamics ◽  
Soil Water Dynamics

This paper focuses on numerical modelling of soil water movement in response to the root water uptake that is driven by transpiration. The flow of water in a lysimeter, installed at a grass covered hillslope site in a small headwater catchment, is analysed by means of numerical simulation. The lysimeter system provides a well defined control volume with boundary fluxes measured and soil water pressure continuously monitored. The evapotranspiration intensity is estimated by the Penman-Monteith method and compared with the measured lysimeter soil water loss and the simulated root water uptake. Variably saturated flow of water in the lysimeter is simulated using one-dimensional dual-permeability model based on the numerical solution of the Richards’ equation. The availability of water for the root water uptake is determined by the evaluation of the plant water stress function, integrated in the soil water flow model. Different lower boundary conditions are tested to compare the soil water dynamics inside and outside the lysimeter. Special attention is paid to the possible influence of the preferential flow effects on the lysimeter soil water balance. The adopted modelling approach provides a useful and flexible framework for numerical analysis of soil water dynamics in response to the plant transpiration.

Monitoring and modelling soil water dynamics using electromagnetic conductivity imaging and the ensemble Kalman filter

Geoderma ◽  
2017 ◽  
Vol 285 ◽  
pp. 76-93 ◽  
Author(s):  
Jingyi Huang ◽  
Alex B. McBratney ◽  
Budiman Minasny ◽  
John Triantafilis
Keyword(s):  
Kalman Filter ◽  
Soil Water ◽  
Ensemble Kalman Filter ◽  
Water Dynamics ◽  
Soil Water Dynamics ◽  
Conductivity Imaging
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