scholarly journals The role of moving air-water interfaces in colloid mobilization within the vadose zone

2003 ◽  
Vol 30 (21) ◽  
Author(s):  
James E. Saiers
Keyword(s):  
Vadose Zone ◽  
Colloid Mobilization

scholarly journals Water Distribution from Artificial Recharge via Infiltration Basin under Constant Head Conditions

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1052
Author(s):  
Tiansong Qi ◽  
Longcang Shu ◽  
Hu Li ◽  
Xiaobo Wang ◽  
Yanqing Men ◽  
...  
Keyword(s):  
Vadose Zone ◽  
Water Distribution ◽  
Artificial Recharge ◽  
Buffer Zone ◽  
Experimental Conditions ◽  
Correlation And Regression Analysis ◽  
Infiltration Basin ◽  
Constant Head ◽  
3D Software

The vadose zone plays a significant role during artificial recharge via the infiltration basin. Its thickness, lithology, heterogeneity, among others greatly affect the recharge efficiency. The main objective of this research is to establish the role of the vadose zone and the impacts of infiltration basin features and vadose zone factors on water distributions. In this work, an ideal conceptual model was considered, and mathematical models were built using HYDRUS (2D/3D) software package version 2.05. A total of 138 numerical experiments were implemented under seven types of experimental conditions. The experimental data were analyzed with the aid of correlation and regression analysis. The results showed that infiltration basin features and vadose zone factors had various impacts on water distribution, low permeability formation had various effects on evaporation depending on its depth, and there were consistent, similar, or different variation trends between infiltration and recharge. In conclusion, it is recommended that when the vadose zones are to be chosen as an infiltration basin site, the trade-off among the infiltration, recharge, storage, and evaporation should be seriously considered. This paper may contribute to a better understanding of the vadose zone as a buffer zone for artificial recharge.

Role of the biotic compartment in the transfer of zinc through the vadose zone - application to an infiltration system

1999 ◽  
Vol 39 (2) ◽  
pp. 209-215
Author(s):  
C. Hébrard ◽  
C. Delolme
Keyword(s):  
Heavy Metals ◽  
Pseudomonas Putida ◽  
Vadose Zone ◽  
Considerable Importance ◽  
Urban Stormwater ◽  
Elution Curves ◽  
Stormwater Infiltration

Relatively little is known about the influence of microorganisms which develop in urban stormwater infiltration basins on the transfer of heavy metals, whereas many reports have emphasized their importance in the mechanisms of retention or solubilization of these elements. We therefore examined the transfer of zinc solutions (2-20 ppm) at different pH (4-7) by columns of sterile sand or sand colonized with Pseudomonas putida. The shape of the elution curves shows that the biofilm adsorbed zinc, causing its elution to be retarded. Adsorption seemed to be reversible, except at pH 6 and 7, and non-instantaneous. Consequently, the stormwater infiltration speed may be of considerable importance.

scholarly journals Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach

CATENA ◽  
2017 ◽  
Vol 149 ◽  
pp. 402-416 ◽  
Author(s):  
C. Pla ◽  
S. Cuezva ◽  
J. Martinez-Martinez ◽  
A. Fernandez-Cortes ◽  
E. Garcia-Anton ◽  
...  
Keyword(s):  
Pore Structure ◽  
Vadose Zone ◽  
Co2 Exchange ◽  
Water Infiltration ◽  
Field Approach

scholarly journals The role of vadose zone physics in the ecohydrological response of a Tibetan meadow to freeze–thaw cycles

2020 ◽  
Vol 14 (12) ◽  
pp. 4653-4673
Author(s):  
Lianyu Yu ◽  
Simone Fatichi ◽  
Yijian Zeng ◽  
Zhongbo Su
Keyword(s):  
Vadose Zone ◽  
Ecosystem Functioning ◽  
Vegetation Dynamics ◽  
Water Transfer ◽  
The Tibetan Plateau ◽  
Soil System ◽  
Cold Regions ◽  
Freeze Thaw ◽  
The Impact

Abstract. The vadose zone is a zone sensitive to environmental changes and exerts a crucial control in ecosystem functioning and even more so in cold regions considering the rapid change in seasonally frozen ground under climate warming. While the way in representing the underlying physical process of the vadose zone differs among models, the effect of such differences on ecosystem functioning and its ecohydrological response to freeze–thaw cycles are seldom reported. Here, the detailed vadose zone process model STEMMUS (Simultaneous Transfer of Energy, Mass and Momentum in Unsaturated Soil) was coupled with the ecohydrological model Tethys–Chloris (T&C) to investigate the role of influential physical processes during freeze–thaw cycles. The physical representation is increased from using T&C coupling without STEMMUS enabling the simultaneous mass and energy transfer in the soil system (liquid, vapor, ice) – and with explicit consideration of the impact of soil ice content on energy and water transfer properties – to using T&C coupling with it. We tested model performance with the aid of a comprehensive observation dataset collected at a typical meadow ecosystem on the Tibetan Plateau. Results indicated that (i) explicitly considering the frozen soil process significantly improved the soil moisture/temperature profile simulations and facilitated our understanding of the water transfer processes within the soil–plant–atmosphere continuum; (ii) the difference among various representations of vadose zone physics have an impact on the vegetation dynamics mainly at the beginning of the growing season; and (iii) models with different vadose zone physics can predict similar interannual vegetation dynamics, as well as energy, water, and carbon exchanges, at the land surface. This research highlights the important role of vadose zone physics for ecosystem functioning in cold regions and can support the development and application of future Earth system models.

scholarly journals How vadose zone mass and energy transfer physics affects the ecohydrological dynamics of a Tibetan meadow?

2020 ◽  
Author(s):  
Lianyu Yu ◽  
Yijian Zeng ◽  
Simone Fatichi ◽  
Zhongbo Su
Keyword(s):  
Vadose Zone ◽  
Land Surface ◽  
Ecosystem Functioning ◽  
Vegetation Dynamics ◽  
Process Model ◽  
Environmental Changes ◽  
Model Performance ◽  
Frozen Soil ◽  
The Tibetan Plateau

Abstract. The vadose zone is a sensitive region to environmental changes and exerts a crucial control in ecosystem functioning. While the way in representing the underlying process of vadose zone differs among models, the effect of such differences on ecosystem functioning is seldomly reported. Here, the detailed vadose zone process model STEMMUS was coupled with the ecohydrological model T&C to investigate the role of solving influential physical processes, considering different soil water and heat transfer parameterizations including frozen soils. We tested model performance with the aid of a comprehensive observation dataset collected at a typical meadow ecosystem on the Tibetan Plateau. Results indicated that: i) explicitly considering the frozen soil process significantly improved the soil moisture/temperature (SM/ST) profile simulations and facilitated our understanding of the water transfer processes within the soil-plant-atmosphere continuum; ii) the difference among various complexity of vadose zone physics have an impact on the vegetation dynamics mainly at the beginning of the growing season; iii) models with different vadose zone physics can predict similar interannual vegetation dynamics, and energy, water and carbon exchanges at the land-surface. This research highlights the role of vadose zone models and their underlying physics, in ecosystem functioning and can guide the development and applications of future earth system models.

The Role of Vadose Zone Physics in the Soil Hydrothermal and Ecohydrological Response of a Tibetan Meadow Ecosystem to Freeze-Thaw Cycles

2021 ◽  
Author(s):  
Lianyu Yu ◽  
Yijian Zeng ◽  
Simone Fatichi ◽  
Zhongbo Su
Keyword(s):  
Vadose Zone ◽  
Ecosystem Functioning ◽  
Water Transfer ◽  
Vapor Flow ◽  
Modeling Framework ◽  
Soil System ◽  
Cold Regions ◽  
Freeze Thaw ◽  
The Impact

<p>The vadose zone is a zone sensitive to environmental changes and exerts a crucial control in ecosystem functioning and even more so in cold regions considering the rapid change in the seasonally frozen ground under climate warming. While the way in representing the underlying physical process of the vadose zone differs among models, the effect of such differences on soil hydrothermal regimes, and then ecosystem functioning and its ecohydrological response to freeze–thaw cycles are seldom reported. Here, the detailed vadose zone process modeling framework STEMMUS (Simultaneous Transfer of Energy, Mass and Momentum in Unsaturated Soil) was coupled with the ecohydrological model Tethys–Chloris (T&C) to investigate the role of influential physical processes during freeze-thaw cycles. The physical representation is increased from using T&C coupling without STEMMUS enabling the simultaneous mass and energy transfer in the soil system (liquid, vapor, ice) – and with explicit consideration of the impact of soil ice content on energy and water transfer properties – to using T&C coupling with it. We tested model performance with the aid of a comprehensive observation dataset collected at a typical meadow ecosystem on the Tibetan Plateau. Results indicated that explicitly considering the frozen soil process and vapor flow significantly improved the soil moisture/temperature profile simulations and facilitated our understanding of the water transfer processes within the soil-plant-atmosphere continuum. We further demonstrated the linkage between the vadose zone physics-induced difference in soil hydrothermal regimes and the ecosystem water/carbon cycles. This research highlights the important role of vadose zone physics for ecosystem functioning in cold regions and can support the development and application of future Earth system models.</p>

Colloid Mobilization and Transport in Undisturbed Soil Columns. II. The Role of Colloid Dispersibility and Preferential Flow

2004 ◽  
Vol 3 (2) ◽  
pp. 424-433 ◽  
Author(s):  
C. Kjaergaard ◽  
P. Moldrup ◽  
L. W. de Jonge ◽  
O. H. Jacobsen
Keyword(s):  
Preferential Flow ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Colloid Mobilization
Sign in / Sign up

Export Citation Format

Share Document